C₂₅H₂₈N₂O₆·0.50(C₆H₆) is monoclinic, C2/c. The unit-cell dimensions at 293 K are a = 13.968(2), b = 25.185(3), c = 15.050(2)Å, β = 102.272(2)°, V = 5173.4(12)ų, D_x = 1.262 g/cm³, and Z = 8. The R value is R = 0.0766 for 1463 reflections. There is an intermolecular hydrogen bond with an N1…N1 distance of 2.851(7)Å. The pyrazole ring adopts a distorted envelope conformation. The molecules in the crystal are packed at the normal van der Waals distances.

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The title compound, N-β-phenylcinnamaldehyd-4-bromoaniline, C₂₁H₁₆BrN, possesses normal geometrical parameters. The observed bond lengths and angles imply that there is little electronic conjugation between three benzene ring systems. In the crystal, molecules interact by way of weak C-H…N and C-H…π interactions, leading to chains propagating in [010].

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The crystal of the title antihypertension agent, C₈H₉Cl₂N₄·C₂H₃O₂, belongs to space group Pbca with the cell dimensions a = 13.389(5), b = 11.007(6), and c = 17.342(5)Å. The final R value is 0.060. The planar hydrazinecarboximidamide moiety is slightly inclined to the phenyl group. The acetate ion plays an important role to connect guanabenz molecules together by hydrogen bonds in the crystal.

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A novel coordination polymer of cobalt(II) with 4-bromobenzoic acid ligand was synthesized. The title complex was crystallized in a monoclinic system, space group P2₁/n with a = 15.396(3)Å, b = 5.8802(12)Å, c = 27.374(6)Å, β = 101.16(3)°, V = 2431.4(9)ų, Z = 4. The central Co(II) atoms are six-coordinated by four O atoms and two N atoms, giving approximately octahedral environments. In the crystal packing of the title complex, molecules are connected by O-H…O hydrogen bonds, forming a linear polymeric chain parallel along the b axis.

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The crystal structures of the title compounds, diastereomeric salts, were determined by X-ray diffraction. (S)-Isomer salt crystallizes in orthorhombic P2₁2₁2₁ with cell parameters a = 6.9577(8)Å, b = 11.9185(13)Å, c = 25.426(3)Å and Z = 4 (the final residual factor 0.0542 for 4289 reflections), while (R)-isomer salt crystallizes with methanol in monoclinic P2₁ with cell parameters a = 11.0302(16)Å, b = 6.2636(9)Å, c = 17.615(3)Å, β = 96.163(3)° and Z = 2 (the final residual factor, 0.0648, for 5281 reflections).

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A N,N′-o-phenylenebis(salicylideneimine) (Salophen) macrocycle with a solvent was prepared and its crystal structure was analyzed. In the structure, an acetonitrile is stabilized in the cavity of the salophen macrocycle by hydrogen bonds. In the packing, intermolecular C-H…O, C-H…N, O-H…N hydrogen bondings, C-H…π interactions, and π…π stacking interactions were observed.

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The title compound, C₁₆H₁₂N₂O₂, consists of a nitro benzoato group fused to the a-face of the carbazole skeleton, in which the planar carbazole skeleton and benzene ring are also coplanar. It belongs to the space group P2₁/n with cell parameters a = 12.220(4), b = 6.9647(10), c = 15.304(3)Å and β = 97.414(3)°. Molecules are linked about inversion centres by N-H…O hydrogen bonds [N…O 2.965(5)Å] to form centrosymmetric dimers.

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The title compound was synthesized and its structure, [In(S₂COPrⁱ)₃] (C₁₂H₂₁InO₃S₆), Mr. = 520.51), was determined. The crystal is monoclinic, space group P2₁ with a = 18.989(5)Å, b = 11.164(3)Å, c = 10.497(5)Å, β = 90.51(3)°; final R = 0.0294. The complex comprises of an enantiomorphous pair of descrete [In(S₂COPrⁱ)₃].

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Diazaphospholidines have the ability to bind with metals and to inhibit cholinesterase (ChE), an enzyme that has a vital role in nerve impulse transition. The crystal structure of 1,3-bis(p-methylphenyl)-2-flouro-1,3,2-diazaphospholidine-2-oxide (1) was determind using single-crystal X-ray diffraction. The five-membered ring containing phosphorus, nitrogen and carbon atoms is slightly puckered. The coordination environment around the phosphorus atom in this compound is approximately tetrahedral.

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The cobalt(III) azido complex, Na[Co(salen)(N₃)₂], contains a Co(III) cation in a distorted octahedral coordination. The equatorial plane of the octahedron is defined by two N and two O atoms from the tetradentate salen ligand, and the axial ligands belong to two terminal N atoms from two different azide anions. Via interactions between the Na⁺ cations and the N and O atoms of the ligands, the [Co(salen)(N₃)₂]^- anions are connected into a polymeric structure, forming corrugated ribbons parallel to [100].

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The title compound, Karanjachromene, C₂₁H₁₈O₄, has been isolated from the seed oil of Pongamia pinnata. Karanjachromene is a fluorescent pyranoflavonoid. Such compounds are reported to have many interesting pharmacological and industrial applications. Here, we report on its isolation in significant yield and X-ray crystal structure.

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The title complex was synthesized and structurally characterized by single-crystal X-ray diffraction. This complex was solved in the triclinic system, space group P1, with the following unit-cell parameters: a = 8.5657(4)Å, b = 10.9848(5)Å, c = 13.1681(6)Å, α = 112.617(1)°, β = 99.646(1)°, δ = 90.849(1)°, Z = 2, V = 1123.28(9)ų. The final R value was R1 = 0.0344 for 15675 measured reflections.

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Enantiomerically pure (4aS,7S,8aS)-7-isopropenyl-4a-methyl-3-methyleneperhydro-chromen-2-one, C₁₄H₂₀O₂, crystallized in an orthorhombic system: cell constants a = 6.565(1), b = 10.880(2), c = 17.716(4)Å; V = 1265.5(4)ų; space group P2₁2₁2₁ Z = 4. The title compound adopts a semi-folded conformation in which the δ-valerolactone and cyclohexane rings are almost perpendicular to one another. Both oxygen atoms are not involved in nonbonding intramolecular contacts with the neighboring atoms.

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A derivative of the new heterocyclic system cyclobuta[4,5]pyrrolo[1,2-a][1,10]phenanthroline was obtained by condensation between 2,9-dimethyl-1,10-phenanthroline and dimethyl acetylenedicarboxylate, and its structure was assigned by X-ray analysis. The strained molecular conformation observed for this pentaheterocyclic framework can be attributed to a series of repulsive intramolecular interactions that render both the phenanthroline system and the four-membered ring non-planar.

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The title compound, C₂₂H₂₃NO₄, is a derivative of osthol isolated from Imperatoria Osthruthium, known to possess an anti-inflammatory effect. The compound was crystallized in space group P2₁/c with cell parameters a = 11.383(3), b = 17.831(4), c = 9.802(2)Å, and β = 94.127(5)°. The final R factor is 0.0629. A modification of the compound has brought about changes in the conformation of C7 and C8. A ring motif, R¹₂ (8), is generated by C-H…O and N-H…O hydrogen bonding. The packing is also stabilized by a C-H…π interaction.

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The crystal structure of 4-cyanopyridinium hydrogen chloranilate, C₆H₅N₂⁺·C₆HCl₂O₄^-, has been determined by X-ray diffraction at the monoclinic space group P2₁/n with cell parameters of a = 14.897(7), b = 4.9790(11), c = 17.066(5)Å, β = 92.49(4)°, Z = 4. In the crystal structure, the molecules form centrosymmetric dimers via the O-H…O hydrogen bonds [2.663(6)Å] with R₂²(10) couplings. The dimers are linked by intermolecular N-H…O [2.606(7)Å] and N…Cl [3.050(7)Å] interactions to construct a large two-dimensional square grid molecular network.

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The title complex was serendipitously obtained by reacting imidazole-4,5-dicarboxylic acid, tetraethylammonium hydroxide, 1,10-phenanthroline, and manganese(II) perchlorate hexahydrate in ethanol-water mixed solvent. It crystallizes in the monoclinic system, space group Cc with a = 24.8043(6), b = 8.7973(2), c = 24.2475(2)Å, β = 118.844(1)°, V = 4634.6(2)ų and Z = 4. A most noteworthy structural feature is that two counterions, namely Et₄N⁺ and ClO₄^- cocrystallize in the crystal lattice.

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The X-ray crystal structure of the antileishmanial 7-methoxy-4-[(E)-oct-1-enyl]pyrrolo[1,2-a]quinoxaline was established. It crystallizes in the monoclinic space group P2₁/c. Solid-state data could be used to clarify the mechanism of action implicating this new antileishmanial 4-(E)-alkenylpyrrolo[1,2-a]quinoxaline.

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The title complex, [(CH₃)₂(HOC₂H₅)Sn(C₄H₆O₂S₂)Sn(HOC₂H₅)(CH₃)₂], was synthesized starting from dimethyltin dichloride, 1,4-dithioerythritol and sodium ethoxide. The crystal structure was determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic system, space group P2₁/n with a = 7.9282(6)Å, b = 11.3888(9)Å, c = 11.0228(9)Å, β = 99.594(3)°, Z = 2, V = 981.36(13)ų. Its crystal structure was determined and refined to a final R = 0.0232 for 1730 independent reflections. The complex is the symmetric dinuclear unit made up of two distorted trigonal bipyramids.

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The title compound, C₂₀H₁₅N_3O, was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the triclinic crystal class in the space group P1 with cell parameters a = 7.724(6)Å, b = 9.059(6)Å, c = 12.186(1)Å, α = 78.588(5)°, β = 73.630(4)°, γ = 70.924(5)° Z = 2. The dihydropyrimidine ring in the quinazoline moiety is in an skew-boat conformation. The structure exhibits intermolecular hydrogen bonds of the type N-H…O and O-H…N.

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Ternary copper(II) complex containing a Schiff-base ligand derived from the condensation of o-vanillin and L-valine and 2,2′-bipyridine has been synthesized. Crystallographic studies show that the Cu(II) ion is coordinated to two oxygen atoms and one nitrogen atom of the Schiff-base anion ligand, and two nitrogen atoms of bipyridine, resulting in a seriously distorted square-pyramidal geometry.

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The crystal of the title compound, C₁₆H₂₀FN₃O₄, belongs to space group P1 with cell dimensions of a = 6.5885(9), b = 10.977(1), c = 12.919(1)Å, α = 69.315(9), β = 88.17(1), and γ = 74.23(1)°. The final R value is 0.050. The key structural feature of the molecule, N-aryloxazolidinone, is not planar. The dihedral angles between the least-squares planes of the oxazolidine and phenyl rings are 52.7(5) and 39.0(6)° in two crystallographically independent molecules.

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The crystal structure of Naptalam, which is a pre-emergent herbicide, has been determined. A tilted amide group connects two planar moieties, which make a stepwise conformation with a dihedral angle of 3.76(7)° from naphtyl and phenyl groups. The molecules correlated with 2₁-axis make a dimmer. The crystal structure is stabilized by an infinite-intermolecular hydrogen-bond and π-π interaction.

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The mononuclear complex [Fe(HL-Br)Cl(py)₂]·C₂H₅OC₂H₅, [H₃L-Br = 6-hydroxy-2-(5-bromo-2-hydroxyphenyl)-5-(5-bromosalicylideneamino)benzoxazole] was synthesized and characterized by single-crystal X-ray analysis. The compound crystallizes in the triclinic system, spaces group P1 and Z = 2 with cell parameters a = 9.0436(9)Å, b = 14.284(4)Å, c = 15.320(3)Å, α = 64.002(14)°, β = 81.430(11)°, γ = 80.642(15)°, V = 1748.4(6)ų. The ligand (HL-Br)^2- acts as a tridentate form, and the iron(III) has octahedral geometry. The crystal packing is stabilized by two types of inter molecular π-π stacking interactions.

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The title compound, C₂₃H₂₄O₄Si, was synthesized by photo-induced reactions and characterized by single-crystal X-ray diffraction. The compound crystallizes in the orthorhombic space group Pbca, with a=9.7299(2), b=19.6064(4), c=21.6264(5)Å, V=4125.63(15)ų, Z=8 and D_x 1.264 g cm^-3. The dihedral angle between the cyclobutene and the attached benzene ring is 38.04(13)°. The molecules are linked into an infinite chain along the a-axis. The crystal structure is stabilized by weak C-H…O and C-H…π interactions.

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The title compound (C₂₀H₂₀NO₃Cl) crystallizes in the triclinic space group P1 with a molecule in the asymmetric unit. The structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R = 0.0397 and wR = 0.1026 using 3171 reflections. The pyrrolidine and the heterocyclic six-membered rings adopt half chair and twist conformations, respectively. The molecules are stabilized by C-H…O type intra and intermolecular interactions in addition to van der Walls forces.

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The title compound, 2-hydroxy-2-(2-methyl-1H-indol-3-yl)-2H-indene-1,3-dione (1), crystallizes in the monoclinic space group P2₁/n with cell parameters a=9.8238(7), b=14.9677(12), c=10.5678(8)Å, β=110.149(4)°, V=1458.79(19)ų and Z=4. The asymmetric unit comprises one crystallographically independent molecule of (1) and one molecule of water as a packing solvent with the formation of intermolcular hydrogen bonds.

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The title compound, C₁₂H₁₃ClN₄O₂, was prepared by the reaction of ethyl 2-(1-ethoxyethylidene)hydrazinecarboxylate with 4-chlorobenzohydrazide. The molecular structure and packing are stabilized by an N-H…N intermolecular hydrogen-bond and a partial π-π overlap of the aromatic rings.

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The complex [Ru(Clazpy)₂Cl₂] (Clazpy = 5-chloro-2-(phenylazo)pyridine) was synthesized and characterized by X-ray diffraction analysis. The geometry around ruthenium(II) was distorted octahedral with coordinating from two chloro ligands and four N-donor atoms of two Clazpy units. The chloros are cis while the N(pyridine) atoms are trans. The Ru-N(pyridine) distance (2.037(2)Å) is slightly short compared to those in other ruthenium(II) complexes with azoimine ligands.

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(S)-1-(4-Chlorobenzoyl)-3-(1-hydroxy-3-phenylpropan-2-yl)thiourea was synthesized and the crystal structure was determined by single-crystal X-ray diffractometry. The carbonyl and thiocarbonyl moieties are pointing in approximately opposite directions, The unit-cell dimensions are a = 7.2302(13)Å, b = 7.4899(15)Å, c = 16.265(3)Å with α = 93.6190(12)°, β = 90.035(2)°, γ = 90.0520(13)° and V = 879.1(3)Å.

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A novel tetrahedral coordinated zinc polymer was hydrothermally prepared and characterized. It was crystallized in the monoclinic system, space group P2₁/c with a = 12.8437(1)Å, b = 5.9596(1)Å, c = 17.2934(2)Å, β = 104.057(4)°, V = 1284.06(18)ų and Z = 4. The structure of the title complex consists of extended two-dimensional double helix chains.

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The X-ray structure of the complex dichlorobis(N-{4-[(2-pyrimidinyl-κN-amino)sulfonyl]phenyl}acetamide)copper(II), containing a metabolite N⁴-acetylsulfadiazine (or N-{4-[(2-pyrimidinylamino)sulfonyl]phenyl}acetamide) of the antibacterial sulfadiazine as ligand, is reported. The complex crystallizes in the space group P2₁/n with a = 12.7531(3)Å, b = 8.0777(2)Å, c = 14.8548(3)Å, β = 112.237(1)°, and Z = 2, requiring it to be centrosymmetric. Two chloride ions and two N⁴-acetylsulfadiazine molecules are coordinated to the metal center, each organic moiety being bonded to Cu(II) through a pyrimidinyl nitrogen atom. The metal coordination sphere includes carbonyl oxygen atoms from symmetry-related complex molecules at the apical sites of the square-planar unit, CuN₂Cl₂, giving a tetragonally-distorted octahedral geometry around Cu(II). Although N⁴-acetylsulfadiazine, itself, has not demonstrated antibacterial activity, the title complex showed moderate growth inhibition of several bacteria in in vitro assays.

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The title structure, 2,6-diisocyano-1,2,3,5,6,7-hexahydro-s-indacene-2,6-dicarboxylic acid diethyl ester is an indane-based amino acid derivative. It crystallizes in the tetragonal space group I4₁/acd with unit cell parameters a=22.868(1)Å c=14.385(1)Å and V=7522.8(1)ų. The residual index of the final refinement is 0.06 for 18734 observed reflections. The five-membered ring is distorted, showing an envelope conformation. The molecular packing is stabilized by C-H…O hydrogen-bonding interactions.

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Mn[2-NMe₂-α-SiMeC₆H₄]₂ (I) is triclinic, P1. The unit-cell dimensions at 203 K are a=9.318(2)Å, b=10.781(3)Å, c=13.453(3)Å, α=88.87(3)°, β=88.34(3)°, γ=76.91(2)°, V=1315.8(6)ų, D_x =1.181 g/cm³, and Z = 2. The final R value is 0.072 for 3442 measured reflections with I > 2σ(I). The structure is synthesized by the reaction of MnCl₂ with 2-dimethylamino-R-trimethylsilylbenzyl-Li. The central Mn(II) metal has four coordination sites by forming a distorted tetrahedron.

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This work reports on the synthesis of a copper(II) coordination compound with 4,4-oxibis(benzoate) (obb) and trans-1,2-bis(4-pyridyl)ethene (bpe) ligands. The complex was characterized by single-crystal X-ray diffraction, which showed a 3D polymeric structure. Each copper center is surrounded by four oxygen atoms at the basal plane and one nitrogen atom and one copper atom at the axial positions, revealing a distorted octahedral geometry. Four carboxylic groups bridge two copper atoms, forming a cage-like structure, with the distance between the metallic centers being 2.656(1)Å.

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The title compound was synthesized and characterized by single crystal X-ray diffraction. The compound crystallizes in the triclinic space group P1; a = 7.4092(5), b = 13.9154(11), c = 16.9139(11)Å, α = 101.576(4), β = 95.892(4) and γ = 99.859(4)°, V = 1666.1(2)ų, Z = 2 and D_x = 1.661 g cm^-3. In the molecular structure, the xanthene ring system is essentially planar and the chromene ring adopts a screw boat conformation. The 1,1-dimethyl-2-propenyl substituent is planarly attached to the attached benzene ring whereas the two p-bromobenzenesulfonyl groups are bisectionally and axially attached to the attached benzene ring. O-H…O intramolecular hydrogen bonds were observed in the molecular structure. In the crystal packing, the molecules are linked by weak C-H…O intermolecular interactions forming chains along the c-axis. The crystal structure is stabilized by intramolecular O-H…O hydrogen bond and weak C-H…O intra-and intermolecular interactions.

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The title compound, aqua[(E)-2-(2-((2,3-dimethyl-5-oxo-1-phenyl-2,5-dihydro-1H-pyrazol-4-ylimino)methyl)phenoxy)-acetato]triphenyltin(IV) (1), C₃₈H₃₅N₃O₅Sn, has been synthesized by the reaction of carboxylic acid [prepared from 2-(2-formylphenoxy)acetic acid with 4-aminoantipyrine in ethanol] with triphenylstannanol in acetonitrile. It is composed of a triphenyltin carboxylate and a coordinated water. The Sn atom is five-coordinate, and has a trans-C₃SnO₂ trigonal-bipyramidal geometry, with the three phenyl groups occupying the equatorial plane, the carboxylate ligand coordinating in a monodentate mode and a water molecule in the axial positions. Strong intermolecular O-H…O hydrogen bonds link the molecules into an infinite one-dimensional chain extending along the c-axis, as well as a weak aromatic π-π stacking and two C-H…π interactions.

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A new inorganic-organic hybrid compound, [C₆H₁₆N₂]ZnCl₄, has been synthesized and characterized by X-ray single-crystal structure analysis. The crystals of the title compound are orthorhombic, Pcab, with the following cell parameters: a = 9.642(5), b = 11.514(4), c = 23.792(4)Å, V = 2641.5(14)ų and z = 8. The crystal structure was solved and refined to R₁ = 0.027 with 2319 independents reflections. The atomic arrangement can be described as being built up by infinite chains of ZnCl₄^2- and (C₆H₁₆N₂)²⁺ groups. The crystal packing is influenced by cation-to-anion N-H…Cl strong hydrogen bonds. Only two chlorine atoms of ZnCl₄^2- anion are act as acceptors of hydrogen bonds.

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The title compounds, [(iso-C₄H₉)₂NH₂][SnPh₃(O₂CCH(CH₃)S)], crystallized in a monoclinic space group P2₁/n with the following cell parameters: a = 9.8537(2)Å, b = 16.7775(3)Å, c = 17.5845(3)Å, β = 103.7740(10)°, V = 2823.48(9)ų, Z = 4 and D_x = 1.375 Mg m^-3. The structure was refined to a final R value of 0.0222 for 5042 reflections [I > 2σ(I)]. The structure of the complex is ionic consisting of an anionic triphenyltin moiety and a cationic di-iso-butylammonium portion. In addition, a hydrogen bonding network between the cations and anions was observed.

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The title compound, a hydrogen-bonded pseudo-dimer, Mn(C₁₉H₁₈N₂O₄)(CH₄O)(H₂O)]ClO₄, (I), has been structurally characterized. Complex (I) affords an elongated octahedral coordination environment, with axial Mn-O(CH₃OH) = 2.296(5) and Mn-O(water) = 2.208(3)Å.

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The crystal structure of [HgL₂], L = 1,3-bis(2-methoxyphenyl)triazene was determined by X-ray diffraction. The complex crystallizes in the orthorhombic system, space group Pna2₁ with a = 8.1817(3), b = 15.4123(6), c = 21.1836(8)Å, V = 2671.23(17)ų, Z = 4. The structure was solved by the full-matrix least-squares on F², and had a refined R value of 0.0274 for 6187 reflections (I > 2σ(I)). The Hg atom is coordinated by two molecules of the title ligand via the N(3), N(4) and N(6) atoms in a distorted triangular pyramid geometry.

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The crystal structure of [CeL(NO₃)]·CHCl₃ (H₂L = 1,8-bis[2-(2-hydroxyphenylideneimino)phenoxy]-3,6-dioxaoctane) was determined by an X-ray diffraction method. This complex was crystallized in the monoclinic system, space group P2₁/c, with a = 11.3671(13)Å, b = 20.135(2)Å, c = 15.4709(18)Å, β = 100.555(2)°, Z = 4, V = 3481.1(7)ų. A single-crystal X-ray diffraction analysis revealed that the Ce(III) ion is coordinated with ten donor atoms, eight of which belong to an open-chain crown ligand, and the remaining two to bidentate nitrate groups. The coordination polyhedron around Ce(III) is a distorted bicapped square antiprism.

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The crystal structure of the title compound, C₁₅H₁₄N₄O₃, reveals the expected trans stereochemistry about the N=N double bond in the diazoamine moiety. The interplanar angle [36.68(6)°] between the terminal phenyl rings indicates that the whole molecule deviates significantly from planarity (r.m.s. deviation = 0.3148 Å). Intermolecular O-H…O classical hydrogen bonds, and hydrogen bonds with a bifurcated geometry generate a three-dimensional molecule arrangement. The distribution of the double-bond character among the N atoms of the diazoamine moiety is unequal, indicating a delocalization of the π electrons over the N=N-N(H) group toward the terminal 4-carboxyphenyl substituent.

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The X-ray structure of the 1:1 co-crystal (1) between the antibacterial drug sulfadimidine (SD) and p-chlorobenzoic acid (PCL) is reported. Compound 1 crystallizes in the space group P2₁/c with a = 15.354(5)Å, b = 14.433(4)Å, c = 18.732(5)Å, β = 94.540(5)°, and Z = 8. In the two independent co-crystal units, identical R₂²(8) hydrogen-bonded motifs occur, each involving the hydrogen bond SD(-SO₂-N-H)…O=C(PCL) and the hydrogen bond PCL(O-H)…N(SD pyrimidinyl). A significant inequality of the two N…O distances in the chemically identical N-H…O=C hydrogen bonds indicates that such parameters can be strongly influenced by the crystal packing factors.

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The title compound, [Ag(Phca₂en)(PPh₃)₂]ClO₄, where Phca₂en is N,N′-bis(β-phenylcinnamaldehyde)ethylenediimine, crystallizes in space group P2₁/n, with a = 21.2044(7), b = 10.5089(3), c = 28.1172(9)Å, β = 109.205(1)°, V = 5916.8(3)ų, Z = 4, T = 292 K, D_calc = 1.386 mg m^-3. The coordination polyhedron about the Ag(I) atom is a distorted AgN₂P₂ tetrahedron and the Phca₂en acts as an N,N′-bidentate ligand.

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The title complex, [Zn((3,4,5-MeO-ba)₂en)I₂], has been synthesized and structurally characterized by single crystal X-ray diffraction. The geometry around the zinc atom is a distorted tetrahedron. This structure consists of intermolecular hydrogen bonds of the type C-H…I and C-H…O.

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The crystal structure of the thallium sulfate selenate tellurate Tl₂[(S_0.6Se_0.4)O₄]Te(OH)₆ was determined with single-crystal X-ray diffraction data. The title compound crystallizes in the monoclinic system with the P2₁/c space group. The unit-cell dimensions at 298 K are a = 12.3580(10)Å, b = 7.2310(10)Å, c = 11.9860(10)Å, β = 111.090(10)°, V = 999.33(19)ų, D_x = 5.029 g/cm³, and Z = 4. The R value is 0.047 for 1799 reflections. The anions are disposed in a number of sheets of pure (S,Se)O₄ tetrahedra, alterning with sheets of pure Te(OH)₆ octahedra. All of those planes are intercalated in a bidimensional arrangement by Tl⁺ cations.

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In an attempt to grow crystals of sodium acid phthalate, the title compound, (phth)₂(H₂O)₃ (1) [phth=phthalate], was obtained which crystallizes in the monoclinic system; space group C2/c, β = 113.65(3)°, V = 1812.9(6)ų, Z = 4, D_c = 1.415 g/cm³, the final R = 0.0781 and wR = 0.2367. O-H groups of phthalate rings form strong hydrogen bonds with lattice water which stabilizes the crystal structure.

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The title compound, 2-phenyl-9-hydrazino-1,10-phenanthroline, crystallizes in the monoclinic space group P2₁/c with the following unit-cell parameters: a = 11.7738(3)Å, b = 20.9998(6)Å, c = 12.4546(4)Å, β = 106.750(1)° and V = 2948.71(15)ų. The crystal structure was solved with a final R = 0.0612 using 6260 independent reflections; it contains two independent molecules in an asymmetric unit, which are joined into a dimer by hydrogen bonds between a phenanthroline N atom and the NH donor of the hydrazine substituent.

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The title compound, C₁₂H₁₁N₃, was synthesized and characterized by X-ray diffraction analysis. In the molecule, the substituted pyridine ring is not coplanar with the azo group, and the angle between the pyridine ring and the azo plane is 7.6(2)°. However, the angle between the azo plane and the benzene ring is 9.7(2)°. The N=N distance is 1.228(2)Å.

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