The title compound, [C₈H₁₂N]₄P₄O₁₂·2H₂O, crystallizes in the monoclinic space group C2/c with unit-cell parameters: a = 34.958(2), b = 8.135(8), c = 15.075(4)Å, β = 107.70(3)°, V = 4084.3(3)ų, Z = 4 and D_x = 1.367 g cm^-3. The atomic arrangement can be described by inorganic layers containing P₄O₁₂ rings and water molecules, parallel to the bc plane and between which are located 2,3-dimethylphenylammonium cations. The grouping is maintained by different types of interactions (electrostatic, H-bonds and van der Waals).

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The title complex, {[Ag(24tbp)₂]SbF₆}_n (24tbp = 2,4-thiobispyridine), was synthesized and characterized by X-ray diffraction analysis. The geometry of the Ag(I) center shows a tetrahedron, coordinated by two 2-pyridinyl and two 4-pyridinyl moieties from four different 24tbp molecules. Each 24tbp joints two Ag(I) ions through two N atoms in respective pyridine groups, and results in a one-dimensional ladder structure.

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The title complex crystallized in the monoclinic space group P2₁/n, with Z = 4, a = 7.566(3)Å, b = 11.539(4)Å, c = 16.349(7)Å, β = 97.51(2)°, V = 1415.1(9)ų, and R = 0.0328. The metal ion exhibits a cis-N₄C_l2 distorted octahedral geometry, with the two dimethylglyoxime (H₂dmg) ligands chelating through their oxime N-atom donors. The two bite angles (75.00(7)° and 74.94(8)°) are much smaller than that in [Ni(Hdmg)₂] (80°).

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A new bis-chelate complex with the formula [Mn(dabtz)₂(NCS)₂], dabtz = 2,2′-diamino-4,4′-bithiazole was prepared and characterized by IR, ¹H NMR, elemental analysis and X-ray crystallography. Two dabtz ligands are coordinated to Mn(II) via bithiazole nitrogen atoms, which lead to five-member chelate rings in a distorted octahedral geometry.

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The crystal structure of ¦Na₇₁¦[Si₁₂₁Al₇₁O₃₈₄]-FAU, a = 24.946(3)Å, dehydrated at 673 K and 1 × 10^-6 Torr, was determined by single-crystal X-ray diffraction techniques in the cubic space group Fd3m at 294 K. About 71 Na⁺ ions per unit cell are found at an unusually large number of crystallographically distinct positions, seven. Five Na⁺ ions are at the centers of double 6-rings (D6Rs, site I). Two site-I′ positions (in the sodalite cavities opposite D6Rs) are occupied by eight and fourteen Na⁺ ions, respectively, per unit cell. Thirteen and fifteen Na⁺ ions per unit cell are found at two site-II positions, in the supercages opposite S6Rs. The remaining twelve and four Na⁺ ions occupy two sites III′ near triple 4-rings in the supercage.

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The crystal structure of a luminous yellow complex of [UO₂(μ-DEP)₄(DMSO)]_n was determined by the X-ray diffraction method. The polymeric complex compound crystallized in the triclinic system, with space group P1, and the following unit-cell dimensions: a = 11.810(2)Å, b = 12.697(3)Å, c = 15.478(3)Å, α = 101.47(3)°, β = 104.63(3)°, γ = 100.18(3)°, Z = 2 and V = 2136.9(9)ų. The final R value is 0.0500 for 8207 measured reflections.

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The crystal structure of [La(μ-DMP)₂(μ₃-NO₃)(DMSO)]_n, (DMP = dimethyl phosphate), (DMSO = dimethyl sulfoxide) was determined by the X-ray diffraction method. This polymeric complex crystallizes in the monoclinic system, with space group P2₁/c, and four [La(μ-DMP)₂(μ₃-NO₃)(DMSO)]_n per unit cell. The unit-cell dimensions are a = 17.157(3)Å, b = 10.214(2)Å, c = 10.224(2)Å, with V = 1774.5(6)ų. The final R value is 0.0440 for 4643 measured reflections.

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The title compound, C₁₇H₂₆N₄O₄Cl₂, was synthesized by reacting benzimidazole, metallic Na and 1,3-dibromopropane in THF. It crsytallizes in the monoclinic C2/c space group. The unit-cell parameters at room temperature are a = 20.818(5)Å, b = 7.754(5)Å, c = 15.133(5)Å, β = 123.221(5)°, V = 2043.6(16)ų, D_x = 1.369 g/cm³, Z = 4. The molecules of the title compound lie on the crystallographic two-fold axis and an asymmetric unit in the unitcell contains half of the molecule and two waters and one chlorine ion. The crystal structure is stabilized by the N-H…O, O-H…O, O-H…Cl, C-H…O and C-H…Cl hydrogen bonding interactions.

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[Mn(Br₂tssb)(phen)(H₂O)]\\middot;H₂O (C₂₁H₁₉Br₂MnN₃O₆S) (1) [where Br₂tssbH₂ is 2-[(E)-(3,5-dibromo-2-hydroxyphenyl)methylene]-amino]-1-ethanesulfonic acid and phen is 1,10-phenanthroline] crystallizes in the monoclinic system, space group of P2₁/c with a = 18.142(3), b = 8.1475(14), c = 16.417(3)Å, β = 90.571(4), V = 2426.4(7)ų, Z = 4, D_c = 1.796 g/cm³, μ = 3.966 mm^-1 and F(0 0 0) = 1300. Each Mn^II ion completed a distorted tetragonal MnN₂O₃ coordination configuration by two oxygen atoms from Br₂tssb^2- groups, two N atoms from the 1,10-phenanthroline ligand and one terminal water molecule. A three-dimensional supramolecular network was constructed through intermolecule hydrogen bonds between terminal water and sulfonate O-atoms and aqua and sulfonate O-atoms and π-π stacking interactions between the Phen ligand and phenyl of the Br₂tssb and halogen interaction.

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The crystal structure of 7H-4-methyl-2H-2-oxopyrano[5,6-c]carbazole has been determined by X-ray diffraction. The crystal, C₁₆H₁₁NO₂, belongs to space group C2/c with cell dimensions of a = 17.29(2)Å, b = 7.398(7)Å, c = 19.09(4)Å, β = 105.36(3)°. The final R value is 0.056 for 2257 reflections (I > 2.00σ(I)). The C=O and the NH groups of neighboring molecules are linked through intermolecular hydrogen bondings to form an infinite chain structure.

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The title compound, C₂₃H₁₈N₄S, was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic crystal class in the space group P2₁/c with cell parameters a = 16.378(2)Å, b = 5.9050(4)Å, c = 25.026(3)Å, β = 127.981(3)°, Z = 4 and V = 1907.7(4)ų. The condensed 1,2,4-triazolo thiadiazole ring is planar. The bond lengths indicate electron deloclization in the triazole ring system.

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In the title compound, C₂₅H₂₄N₂O₂, the piperidinone ring adopts its usual twist boat conformation. The crystal packing is stabilized by a three-dimensional network of C-H…O hydrogen bonds involving the carbonyl O atom. In addition, there is an intramolecular C-H…π interaction. No significant aryl-aryl interactions were observed.

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The chemical preparation and crystal structure are given for a new organic cation dihydrogenmonophosphate, (2-NH₂-5-Cl-C₅H₃NH)H₂PO₄, in the solid state. This compound is monoclinic P2₁/c with the following unit-cell parameters: a = 4.673(6)Å, b = 23.905(4)Å, c = 7.981(1)Å, β = 98.29(13)°, Z = 4 and V = 882.2(2)ų. The crystal structure was solved and refined to R = 0.03, with 2060 independent reflections. The atomic arrangement can be described by inorganic layers of H₂PO₄^- anions parallel to the (a, c) planes at y = 1/4 and y = 3/4, between which organic groups (2-NH₂-5-Cl-C₅H₃NH)⁺ are located. All ring atoms of the organic entity are coplanar. The exocyclic N atom is an electron-receiving center, which is consistent with features of imino resonance evidenced by the bond lengths and angles.

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[2,6-(CH₃)₂C₆H₃NH₃]₃P₃O₉·H₂O was synthesized and characterized by X-ray diffraction. This compound crystallizes in the monoclinic space group P2₁/n with a = 6.803(4), b = 24.816(6), c = 17.330(2)Å, (β = 91,70(5)° and V = 2924(2)ų. The crystal structure was determined and refined to R = 0.040 and R_w = 0.053. The atomic arrangement can be described as inorganic chains containing P₃O₉ rings, with the ammonium group of the organic cation [RNH₃]⁺ and water molecules extending along the a direction. Between these chains are anchored the 2,6-dimethylanilinium groups, giving rise to a three-dimensional network.

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The crystal structure of 1,1-dimethoxy-4,4-bis(phenylamino)-3-buten-2-one (I) has been determined. There are two symmetrically independent molecules in the crystal lattice with some differences in the bond lengths, angles and torsion angles. The nitrogen atoms are nearly planar and π-delocalization exists in I. In the crystal structure, two different parallel infinite chains are produced by N-H…O hydrogen bonds, each of them containing one of the two independent molecules.

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The crystal structure of (bdaH₂)(pydcH)₂\\middot;2H₂O (bda = benzene-1,3-diamine, pydcH₂ = pyridine-2,6-dicarboxylic acid) was determined by an X-ray diffraction method. This compound crystallized in the triclinic system, space group P1, with two formula units in the unit cell. The unit cell parameters are: a = 8.3390(8)Å, b = 11.1377(11)Å, c = 13.2476(13)Å, with α = 106.067(5)°, β = 94.345(5)° and γ = 109.625(5)°. The final R value is 0.0540 for 2838 measured reflections. This compound shows intermolecular hydrogen bonds of the type O-H…O, N-H…O, and N-H…N as well as ion-pairing in the crystal packing.

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The crystal structure of (pdaH₂)(py3,5dc)\\middot;H₂O, (pda = propane-1,3-diamine, py3,5dcH₂ = pyridine-3,5-dicarboxylic acid) was determined by an X-ray diffraction method. This compound crystallized in the monoclinic system; space group P2₁/c, with four formula units in the unit cell. The unit-cell parameters are a = 8.7213(9)Å, b = 19.5049(19)Å, c = 8.0942(8)Å with β = 112.842(5)°. The final R value is 0.0430 for 2259 measured reflections. The most important features in the crystal structure of this compound are the presence of ion-pairing and a large number of O-H…O, N-H…O and N-H…N hydrogen bonds.

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The title compound was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic crystal class in the space group C2/c with cell parameters a = 29.8520(1)Å, b = 9.5220(7)Å, c = 14.9130(1)Å, β = 112.252(4)°, Z = 8. The geometries around the S atom are distorted from a regular tetrahedron.

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The title compound, C₁₄H₁₀N₄O₂, was synthesized from the condensation of isatin and isonicotinyl hydrazide. The crystal structure was determined by single-crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pna2₁ with a = 8.0391(16)Å, b = 28.645(6)Å, c = 5.2812(11)Å, β = 90°, V = 1216.2(4)ų, Z = 4, D_x = 1.454 Mg/m³, μ = 0.102 mm^-1, F(000) = 552. The final R value was 0.0613 for 1970 measured reflections. Intermolecular N-H…O hydrogen bond stabilizes the crystal structure by causing the formation of a supramolecular architecture.

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The title compound, C₁₁H₁₅N₅, crystallizes in the monoclinic space group P2₁/n with cell parameters a = 6.9935(1), b = 14.4416(3), c = 11.5160(2)Å, β = 93.608(1)°. The zwitterionic molecular structure consists of a cyclopropene ring substituted by two cyanoimino and a triethylammonium group. The two NCN groups, the C₃ ring and the N atom of the NEt₃ group are coplanar. In the crystal, the molecules are stacked perpendicular to these planes.

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The compound, 4-(3,4-dichlorophenyl)-3,4-dihydro-1(2H)-naphthalone (tetralone), C₁₆H₁₂Cl₂O, crystallizes in the monoclinic crystal class in the space group P2₁/n with cell parameters a = 10.606(2)Å, b = 22.110(5)Å, c = 12.477(2)Å, β = 110.647(1)°, V = 2737.9(9)ų and Z = 8.

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The title compound, C₁₈H₁₅N₃O₂, was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic space group P2₁/c with cell parameters a = 6.9540(4)Å, b = 11.4780(12)Å, c = 18.5410(19)Å, β = 96.948(5)°, Z = 4. The structure exhibits intermolecular hydrogen bonds of the type N-H…N.

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The title compound C₁₃H₁₀N₄O₂, was synthesized and charecterized by X-ray diffraction analysis. The compound crystallizes in the triclinic crystal class in the space group P1. The cell parameters are a = 6.414(5)Å, b = 14.149(2)Å, c = 14.859(2)Å and Z = 4. The final residual factor is R = 0.0629. The compound exhibits inter-molecular hydrogen bonding of the type C-H…N.

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A new complex, [Cu(tssb)(phen)H₂O]·C₂H₅OH·0.5H₂O, crystallizes in the triclinic, space group P1 with cell parameters a = 10.593(2), b = 11.600(2), c = 21.170(4)Å, α = 103.340(4), β = 96.937(4), γ = 105.056(3)°, Z = 4, V = 2398.9(7)ų. Its crystal structure was determined and refined to a final R = 0.0468 for 10894 independent reflections. The Cu(II) ion forms a distorted octahedral geometry by one nitrogen atom and two oxygen atoms from tssb, two nitrogen atoms from phen and one oxygen atom from water.

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5-Amino-2-benzoxazolone crystallizes in an orthorhombic space group, P2₁2₁2₁, with cell dimensions a = 4.4766(12)Å, b = 7.1015(19)Å, c = 20.095(5)Å and V = 6673(3)ų, Z = 4. The final R value is 0.0366 for 1487 reflections (I > 2σ(I)). 2-Benzoxazolone moiety is planar and the title compound exists in a 2-D framework (in crystal lattice), which is produced via two different types intermolecular N-H…O hydrogen bonds.

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The crystal structure of (pycH)₂(btcH₂)\\middot;2H₂O (pyc = pyridine-4-carbamide, btcH₄ = benzene-1,2,4,5-tetracarboxylic acid) was determined by the X-ray diffraction method. This compound crystallized in the monoclinic system, space group C2/m, with two formula units in the unit cell. The unit cell parameters were: a = 12.451(2)Å, b = 6.1449(8)Å, c = 15.657(3)Å, with β = 108.263(13)°. The final R value was 0.0296 for 1114 measured reflections. This compound shows intermolecular hydrogen bonds of the type O-H…O, and N-H…O, as well as ion-pairing in the crystal packing.

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The crystal structure of (pipzH₂)_1/2 (pydcH)\\middot;(pydcH₂)\\middot;H₂O (pipz = piperazine, pydcH₂ = pyridine-2,6-dicarboxylic acid) has been determined by X-ray diffraction. This compound crystallized in the triclinic system, space group P1 with unit cell parameters: a = 8.338(3)Å, b = 9.246(3)Å, c = 11.843(4)Å, α = 97.435(6)°, β = 94.580(6)°, γ = 109.960(5)°. The final R value was 0.0434 for 2950 measured reflections. This compound has a sheet motif made by strong and weak hydrogen- bonding interactions between carboxylic acids, which have a host role for piperazine guests.

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A proton-transfer compound, (daptzH)₂(ox), was synthesized from the reaction of 2,6-diamine-4-phenyl-1,3,5-triazine, daptz, and oxalic acid, oxH₂. The crystal structure was determined by single-crystal X-ray diffraction. This compound crystallized in the space group P2₁/c of the monoclinic system and contained two molecules per unit-cell. The unit-cell parameters are a = 13.395(5)Å, b = 6.613(3)Å, c = 12.131(4)Å and β = 109.79(2)°. The final R value was 0.0548 for 2086 measured reflections. The important feature of this crystal is N-H…O and N-H…N hydrogen-bond linkage between anion and cation groups and the cationic part themselves.

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The X-ray crystal structure of the progestogen flurogestone acetate was established. It crystallizes in the monoclinic space group P2₁. The absolute configuration was determined by observing and calculating the F(+)/F(-) ratios of Bijvoet pairs, and by determining the Flack factor.

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The X-ray structure of diethyl 10-(4-nitrobenzoyl)-pyrrolo[1,2-a][4,5]diazafluoren-5-one-8,9-dicarboxylate, a representative compound that features a tetracyclic ring system, is reported. It crystallizes in the monoclinic space group P2₁/c with unit cell parameters a = 7.9340(2)Å, b = 31.0480(7)Å, c = 9.4411(2)Å, β = 94.956(1)°, and Z = 4. Significant helical distortion of the tetracyclic system was observed, with an extent comparable to that occurring in pyrrolophenanthroline ring systems previously investigated. The distortion is induced by an intramolecular steric repulsion between the pyridine nitrogen atom and the carbonyl carbon atom of the nitrobenzoyl moiety.

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The title compound crystallizes in the orthorhombic space group Pbca with a = 8.283(1), b = 26.201(2), c = 14.066(2)Å, V = 3052.8(5)ų, Z = 8, D_cal = 1.368 Mg/m³. The crystal structure was solved by direct methods using single-crystal X-ray diffraction data and refined by full-matrix least-squares procedures to a final R-value of 0.0356 for 2536 observed reflections. The pyrazoline ring is in an envelope conformation. The dihedral angles between the pyrazoline ring and the phenyl rings A and B are 68.2(1) and 12.1(1)°, respectively. The crystal packing is influenced by O-H…N, N-H…O, C-H…O, C-H…π hydrogen bonds, and π-π interactions.

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The title compound, C₁₅H₁₆N₂O₃, was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the orthorhombic space group Pbca with cell parameters a = 17.3530(6)Å, b = 8.158(3)Å, c = 20.482(3)Å, Z = 8. The structure exhibits intermolecular hydrogen bonds of the type C-H…N.

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A new dipolarophile, used to construct bioactive heterocycles, 2-(4-methoxyphenyl)-3-(3,4,5-trimethoxyphenyl)-acrylonitrile, C₁₉H₁₉NO₄, was synthesized by base-catalyzed reaction of 3,4,5-trimethoxybenzaldehyde with (4-methoxyphenyl)acetonitrile. The compound crystallizes in the monoclinic space group P2₁/c with cell parameters a = 7.2880(4)Å, b = 8.1030(9)Å, c = 28.460(3)Å, β = 94.018(5)°, Z = 4. The structure exhibits both inter and intramolecular hydrogen bonds of the type C-H…O and C-H…N.

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The title compound, bearing a twenty-membered ring, was synthesized by macrolactonization of a hydroxy carboxylic acid. The structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic system, space group P2₁/c. In the crystal, two remarkable kinds of interactions between two ester groups and between two arylacetylene moieties were detected.

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The single-crystal structure of the B′ form of nonadecanoic acid (C₁₉H₃₈O₂) has been determined at room temperature. This solid form is triclinic P1 with Z = 4. The asymmetric unit is composed of two molecules. The cell dimensions are: a = 5.553(2)Å, b = 7.987(3)Å, c = 44.612(5)Å, α = 92.10(2)°, β = 93.05(2)°, γ = 99.64(3)° and V = 1945.8(10)ų. The R value is 0.0887 for 2045 observed reflections.

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A protonated cation salt of title compound C₃₆H₄₈N₈O₁₂ crystallized in the monoclinic space group with cell parameters a = 11.4721(8)Å, b = 23.1049(16)Å, c = 21.0730(14)Å, β = 99.0040(10)° and Z = 4; the final residual factor was 0.0582 with 9694 reflections. A cyclophane conformation was determinated by an interplay between the ridigidy of amide and phenyl groups and the presence of intramolecular hydrogen bonds and C-H…π interactions.

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The crystal structure of the title organic complex molecule was determined by X-ray diffraction analysis to show that it is a 1:1 host-guest inclusion complex. The crystal of the complex is monoclinic, P2₁/c, Z = 4, a = 11.9882(2), b = 24.1533(4), c = 12.7398(2)Å, β = 114.869(1)°, V = 3346.80(9)ų. The guest 3-aminopropyltriethoxysilane molecule is accommodated in the host framework by N-H…O, O-H…N, and C-H…π interactions. This structural feature effectively prevents hydrolysis of the guest with moisture in the air.

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The title compound, C₁₂H₁₀N₄S (3), crystallizes in the monoclinic space group P2₁/c, with cell constants a = 5.6627(10)Å, b = 27.640(5)Å, c = 7.5634(14)Å, β = 99.976(3)°, and Z = 4. The regioselective formation of this compound is a result of a steric consideration. The three heterocyclic rings are in-plane bound, and in the crystal lattice molecules of 3 are arranged in layers with a distance of 3.612 Å.

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The crystal structure of [ZnL(4,4′-bipyridyl)₂](ClO₄) (HL = 2-((2-(2-(benzylamino)ethylamino)ethylimino)methyl)-phenol) was determined by X-ray diffraction method. This complex crystallized in the monoclinic space group P2₁/c, with, a = 10.536(2), b = 12.172(2), c = 22.219(4)Å, β= 99.330(3)°, Z = 4, V = 2811.5(10)ų, and R = 0.0417. Each Zn^II ion completed a distorted square pyramidal coordination configuration by three N donor atoms and one phenolic O donor atom from the Schiff base ligand, and one N donor atom from 4,4′-bipy molecule. Hydrogen-bonding dimmers were formed between two adjacent complex molecules by hydrogen bonding between a bipy molecule and a coordinated nitrogen atom of another complex molecule.

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The title compound, [Zn(C₁₀H₉O₂)₂·CH₃OH], crystallizes with the triclinic space group P1 with cell parameters a = 9.4115(6)Å, b = 9.9001(6)Å, c = 12.4263(7)ÅAÅ, α = 103.352(1)°, β = 101.732(1)°, γ = 113.393(1)°, and Z = 2; two bidentate benzoylacetonate anions and one methanol molecule in the asymmetric unit.

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The title POM-based organic-inorganic hybrid compound consists of one PMo₁₂O₄₀^3- polyoxoanion, three symmetrically independent glycinium cations and five solvated H₂O molecules; several N-H…O and O-H…O hydrogen bonds between organic cations, inorganic anions and solvated H₂O molecules in the crystal lattice lead to a 3-D supramolecular framework.

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The crystal structure of 1,1-dimethoxy-4-phenylamino-4-methylthio-3-buten-2-one I, C₁₃H₁₇NO₃S, has been determined. The title compound is packed in columns along the a axis. C(4), C(5), C(6) and nitrogen atoms in the structure are coplanar and π-delocalization exists in I. The tautomer enamino ketone of I is stablized by π-delocalization and intra-molecular hydrogen bond.

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The title compound crystallizes in the triclinic space group P1 with a = 6.323(7), b = 6.964(8), c = 11.740(13)Å, α = 104.602(19), β = 98.867(19), γ = 98.726(19)°, V = 484.4(9)ų, and Z = 1. The X-ray structure analysis of this compound leads to revision of the previously published isomeric constitution.

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The reaction of copper(I) iodide with 3-(methylthio)-1-thiomorpholinopropan-1-one (L) as an asymmetric dithia-ligand gave an elegant brick-wall-shaped coordination polymer, [CuIL]_n (1). The crystal structure of 1 demonstrates that the rhomboid Cu-I₂-Cu linker plays an essential role in the construction of such a supramolecular framework.

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The title compound, C₂₇H₂₆N₄O₅, was synthesized by the condensation of 1-phenyl-3-methyl-4-benzoylpyrazolone-5 and 3,4,5-trimethoxybenzoylhydrazide. The crystal structure was determined by single-crystal X-ray diffraction. It crystallizes in the triclinic system, space group P1 with a = 9.1895(18)Å, b = 12.201(2)Å, c = 12.500(3)Å, α = 78.32(3)°, β = 74.23(3)°, γ = 68.86(3)°, V = 1249.4(4)ų, Z = 2, R = 0.0605. The inter- or intramolecular N-H…O hydrogen bonds, together with π-π stacking interactions, stabilize the crystal structure by causing the formation of a one-dimensional chain structure.

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A new dipolarophile, used in the construction of bioactive heterocycles, 3-(2-chloro-6-fluoro phenyl)-2-(4-methoxyphenyl)acrylonitrile, C₁₆H₁₁ClFNO, was synthesized by the base-catalyzed reaction of 2-chloro-6-fluorobenzaldehyde with (4-methoxyphenyl)acetonitrile. The compound crystallizes in the orthorhombic space group Pca2₁ with cell parameters a = 29.1430(3)Å, b = 4.1290(16)Å, c = 11.205(4)Å, Z = 4. The structure exhibits intermolecular hydrogen bond of the type C-H…N.

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The crystal structure of another polymorph of 1,4-anthraquinone was determined. The compound crystallizes in monoclinic, space group P2₁/n with a = 7.301(1), b = 9.674(2), c = 13.831(2)Å, β = 93.175(8)Å, V = 975.5(3)ų, Z = 4. There is antiparallel π-π stacking between aromatic rings. The packing arrangement is different from another crystal structure for 1,4-anthraquinone (space group P2₁/b with a = 8.430(1), b = 19.846(2), c = 5.927(1)Å, γ = 100.21(2)°, CCDC code: COBBIE04).

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The crystal structure of the title compound, C₁₄H₉F₆N₃, shows the expected stereochemistry trans about the N=N double bond in the diazoamine moiety. The interplanar angle [8.3(1)°] between the terminal phenyl rings indicates that the whole molecule is almost planar (r.m.s. deviation = 0.0929 Å). The molecule shows intramolecular N-H…(F1, F2) bifurcated, and non-classical C-H…F hydrogen bonds. The unequal distribution of the double-bond character among the N atoms of the diazoamine group indicates a delocalization of the π electrons over the N=N-N(H) moiety towards the terminal 2-trifluoromethylphenyl substituents.

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C₂₅H₃₉ KO₁₀ is monoclinic, P2₁. The unit-cell dimensions at 293 K are a = 10.6996(8), b = 7.8839(6), c = 15.8913(11)Å, V = 1313.86(17)ų, D_x = 1.362 g/cm³, and Z = 2. The R value is R = 0.037 for 4604 reflections. The A, B, C, D and E rings occur in a conformation between envelope and half chair, distorted chair, distorted chair, distorted envelope, and distorted chair, respectively. The three-dimensional structure is completed by the formation of hydrogen-bonded chains by the anions.

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The crystal structure of Cu₂(dae)(CH₃SO₃)₂ (dae = diallyl ether) was determined by X-ray diffraction. The complex crystallizes in monoclinic system space group P2(1)/n with a = 9.033(3)Å, b = 15.985(6)Å, c = 9.598(4)Å, β = 90.314(6)°, V = 1385.9(9)ų, Z = 4. The structure was solved by direct methods (SHELX-97) and refined to a final R value of 0.053 for 1987 reflections (I ≥ 2 σ(I)). The novel linear complex consists of dimeric units that are interconnected by Cu-O-Cu bridges to give an infinite chain.

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