The chemical preparation and crystal structure are given for a (carbonato)bis(1,10-phenanthroline)cobalt(III) nitrate trihydrate, [Co(phen)₂CO₃]NO₃·3H₂O, in the solid state. This complex crystallized in the triclinic space group P1 with the following unit-cell parameters: a = 8.022(2)Å, b = 10.329(2)Å, c = 15.998(3)Å, α = 106.09(1)°, β = 102.74(1)°, γ = 90.88(2)°, Z = 2 and V = 1238.2(4)ų. The final R value is 0.0581 for 4885 measured reflections.

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The title compound, neoirietetraol (C₂₀H₃₄Br₂O₄), was isolated from the Okinawan red alga Laurencia yonaguniensis. The crystal belongs to space group P2₁ with cell dimensions a = 8.1048(1), b = 15.3013(3), c = 10.7455(3)Å and β = 102.337(1)°. The absolute stereochemistry of the title compound was established as (1S, 4R, 5R, 7R, 10S, 11R, 12S, 14R).

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The crystal of the title compound, C₁₅H₁₈ClN₃O₃S, belongs to space group P2₁/a with cell dimensions a = 12.744(5), b = 8.260(2), c = 15.513(5)Å, and β = 93.42(2)°. The final R value is 0.053. The piperadine ring is almost perpendicular to the benzothiazolyl ring. The piperadine ring adopts a chair conformation in which the acetyl and ethanol groups are equatorial. There is one intermolecular O-H…N hydrogen bond that connects two molecules around the center of symmetry into a dimer.

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A crystal of 2,3-dimethyl-1-isopropylimidazolium bromide was prepared and its crystal structure determined at the orthorhombic space group Pnma with cell parameters a = 11.407(6), b = 7.157(4), c = 12.111(7)Å, Z = 4. Sandwiched structures were observed between the cations and the bromide anions. The π…Br and C-H…Br interactions contributed to stabilization of the crystal packing of the title compound.

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C₂₅H₃₄O₄ is orthorhombic, P2₁2₁2₁. The unit-cell dimensions at 293 K are a = 7.3969(10), b = 11.0606(12), c = 27.266(3)Å, V = 2230.7(5)ų, D_x = 1.187 g/cm³, and Z = 4. The R value is R = 0.0766 for 1119 reflections. The A, B, C and D rings occur in a distorted envelope, a distorted half chair, a chair, and a half chair, respectively. The molecules in the crystal are packed at normal van der Waals distances.

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The title compound comprises two slightly different types of [(AcO)Bu₂Sn(OH)OSnBu₂]₂ units, which are hydrogen bonded via the μ-OH and AcO groups, giving a polymeric structure.

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The structure of the title compound, C₁₇H₁₆N₂O₃S, was prepared by the reaction of chromone-3-carboxaldehyde with 2-thioxo-imidazolidine-4-one and ethyl iodide. The five-membered imidazolidine ring is in a planar conformation with a maximum deviation of 0.013(1)Å, and making a dihedral angle of 5.36(5)° with the benzopyran ring system. The crystal structure is stabilized by intra and intermolecular hydrogen-bond interactions.

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The crystal structure properties of [BeI₂(OEt₂)₂] (OEt₂ = diethyl ether) are: monoclinic, space group P2₁/n with a = 8.7737(18)Å, b = 12.596(3)Å, c = 26.086(5)Å, β = 93.36(3)°, V = 2877.9(10)ų, Z = 8, R₁ = 0.0316, wR₂ = 0.0640 for 7240 reflections (I > 2σ(I)). The compound crystallizes with two crystallographically independent molecules in the asymmetric unit and contains the first structurally characterized examples of Be-I bonds in a molecular compound.

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The crystal structure of N,N′-bis(2-chlorobenzylidene)ethylenediamine, C₁₆H₁₄Cl₂N₂, has been determined. The molecule possesses a crystallographically imposed center of symmetry. In the crystal packing, the molecules are linked via weak intermolecular C-H…N and C-H…Cl hydrogen bonds.

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The crystal of the title compound, C₁₀H₁₃NO₄S₂, belongs to space group Pbca with cell dimensions a = 10.070(2), b = 14.362(3), and c =16.237(3)Å. The final R value is 0.057. The 3,4-dihydro-2H-thiopyran ring takes a half-chair conformation. Two sulfur atoms are significantly deviated from the phenyl plane. They are located on the same side of the plane. There are three intermolecular hydrogen bonds between the amino group and the sulfone oxygen atoms.

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The title compound, C₂₄H₃₂N₇O₂P₃, a cyclotriphosphazene, has a spiro-ansa-spiro architecture, in which the bicyclic system resembles the stable “adamantane” structure. Two N and two P atoms are capable of representing stereogenic centres (meso form). It belongs to the space group P2₁/c with cell parameters a = 10.6133(7), b = 9.3246(4), c = 26.6523(18)Å, β = 98.575(5)°.

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The title complex has been synthesized and structurally characterized by single-crystal X-ray diffraction. This complex has a dinuclear structure where two copper(II) ions are bridged by two bent alkoxo groups. The citrate acts as a tetradentate ligand coordinating via three carboxylates and an alkoxo groups in which one of three carboxylates is coordinated weakly. The coordination geometry around the Cu(II) is strongly distorted square pyramidal. The distance between the two copper atoms is 2.8386(3)Å.

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The single-crystal structure of 7-chlorobenzodiazepin-2,4-dione (C₉H₇ClN₂O₂) was determined at room temperature with X-rays and refined to R = 0.1067 for 890 observed reflections. This crystal is monoclinic, P2₁/m with Z = 2. The unit-cell dimensions are: a = 9.624(3)Å, b = 11.739(4)Å, c = 3.9853(11)Å, β = 94.83 (2)° and V = 448.6(2)ų. The Cl(1) and H(2) atoms are disordered over two sites with 0.50 occupancy, the molecule is symmetrical to the mirror.

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CoC₁₆H₂₈N₂O₁₂S₂(I) is triclinic, P1. The unit-cell dimensions at 298 K are a = 7.1695(8)Å, b = 7.5352(8)Å, c = 11.7452(13)Å, α = 103.682(2)°, β = 104.187(2)°, γ = 101.194(2)°, V = 575.91(7)ų, D_x = 1.625 g/cm³, and Z = 1. The final R value is 0.026 for 2020 measured reflections. The structure is constructed from Co(H₂O)₆²⁺ and two anions of 1-oxopyridinium-2-thiopropionate (C₈H₈O₃NS) linked through hydrogen bonding into an extended network. The central cobalt(II) metal has six coordination by forming an octahedron.

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The title compound was prepared by reacting mercuric(II) bromide and ferron (7-iodo-8-hydroxyquinoline-5-sulfonic acid), [C₉H₆INO₄S·H₂O, 0.5(Br₂HgO)] in water. It crystallizes in the monoclinic C2/c space group. The unit-cell parameters are a = 25.916(3), b = 7.117(3) c = 17.567(3)Å, β = 119.47(3)°. The final R value is 0.0361 for 3066 measured reflections. Mercury is present in a distorted T-shaped geometry with two short Hg-Br bonds (Hg-Br 2.414(13)Å) and one long Hg-O (water) bond (Hg-O2W 2.701(9)Å). The crystal structure is stabilized by C-H…O, O-H…O, N-H…O and O-H…I hydrogen bonds.

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The complex [Ru(azpy)₂(bpy)](PF₆)₂ (azpy=2-(phenylazo)pyridine, bpy=2,2′-bipyridine) was synthesized and characterized by X-ray diffraction analysis. The coordination geometry around ruthenium(II) was distorted octahedral with coordinating from two N-donor centers of bpy and four N-donor centers of two azpy units. The Ru-N (pyridine of azpy) distance was (average, 2.048(4)Å), shorter than the Ru-N (bpy) distance (average, 2.088(4)Å). The average N = N distance in the title compound was 1.278(5)Å, slightly longer than that of the free azpy ligand, 1.248(4)Å. These results confirm that azpy is a stronger π-acceptor than bpy.

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In the title compound, C₁₁H₈Br₄, there is a norbornane skeleton with four Br atoms, having a benzene ring fused on one side. It crsytalizes in the orthorhombic Pbca space group. The unit-cell parameters at 294(2)K are a = 11.9910(10), b = 11.335(2), c = 18.191(4)Å, V = 2472.5(7)ų, D_x = 2.470 g cm^-3, Z = 8.

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The title compound, 1-(2-benzoylphenyl)-3,3-dimethyltriazene (I), C₁₅H₁₅N₃O, crystallizes in the triclinic system, space group P1 with cell constants: a = 8.3555(9), b = 8.9826(16), c = 10.0609(14)Å, α = 88.517(16), β = 80.956(11), γ =69.082(11)°. 1-(4-Benzoylphenyl)-3,3-dimethyltriazene (II), C₁₅H₁₅N₃O, crystallizes in the same crystal system and space group with two independent molecules in the asymmetric unit: a = 11.453(9), b = 12.046(7), c = 12.237(4)Å, α = 71.66(3), β = 65.22(3), γ = 65.03(6)°.

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Sodium 12-molybdophosphate hexadecahydrate, Na₃PMo₁₂O₄₀·16H₂O crystallizes in a monoclinic space group P2₁/m, with cell dimensions a = 11.4703(4)Å, b = 15.1849(6)Å, c = 13.7083(5)Å, β = 106.902(1)° and V = 2284.51(15)ų, Z = 2. The final R value is 0.0319 for 5719 reflections (I > 2σ(I)). The crystal is built up of the heteropolyanion (of the Keggin form), six-coordinated sodium ions and water molecules in a 3-D supramolecualr framework, which is produced by some different O-H…O hydrogen bonds.

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The crystal structure of the title compound shows three complexes as anionic and cationic parts, where all of them are six coordinated. Crystallization was occurred in the triclinic system, space group P1 with a = 14.0445(9)Å, b = 14.8834(10)Å c = 17.4394(12)Å, α = 65.3880(10)°, β = 69.457(2)°, γ = 85.997(2)°, V = 3090.9(4)ų, Z = 2. In the formation of this crystal, metal-ligand coordinations, hydrogen-bonding (O-H…O and C-H…O) and ion-pairing throughout the lattice play important roles in stabilizing the three-dimensional network.

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The crystal structure properties of [{Sn(PCy₂)₃}{(SnCl)₃O}] (Cy = cyclohexyl) are: triclinic, space group P1 with a = 12.672(3)Å, b = 13.914(3)Å, c = 16.449(3)Å, α = 67.64(3)°, β = 67.85(3)°, γ = 75.73(3)°, V = 2466.1(9)Å, Z = 2, R₁ = 0.0476, wR₂ = 0.0944 for 6725 reflections (I > 2σI). The cage compound can be considered as comprising a [Sn(PCy₂)₃]-anion complexing a [(SnCl)₃(μ₃-O)]⁺ cation.

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The first X-ray structure of the anxiolytic midazolam, in the form of its saccharinate salt 1, is reported. Compound 1 crystallizes in the space group P2₁/c with a = 8.5246(1)Å, b = 25.6189(4)Å, c = 10.2249(2)Å, β = 90.719(1)°, and Z = 4. Salt formation involves the transfer of a proton from the acidic saccharin molecule to an imidazo-nitrogen atom of the midazolam molecule. A strong hydrogen bond of the type N⁺-H…O (N⁺…O 2.643(2)°) links the cation and the anion. The pharmaceutical relevance of the salt is discussed.

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The crystal structure of 4-[(4′-formyl)phenoxy methyl]carbostyril is reported herein. The compound crystallizes in the monoclinic system, with a space group of C2/c. The unit-cell dimensions are a = 25.1558(15)Å, b = 6.3024(4)Å, c = 22.7027(14)Å, with β = 122.084(3)° and Z = 8. The final R indices is R₁ = 0.0382.

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X-ray crystallography was used to investigate the resulting Ni(II) complex, (tataH)₂[Ni(pydc)₂]·5.25H₂O, (tata = 2,4,6-triamino-1,3,5-triazine, Melamine, and pydcH₂ = pyridine-2,6-dicarboxylic acid). This compound crystallized in the monoclinic space group P2₁/c and Z = 8, with parameters a = 19.8641(6), b = 19.1247(6), c = 17.4442(5)Å and β = 115.8360(10)°. The final R value was 0.0427 for 12714 measured reflections. The coordination number around each Ni(II) atom was six, with a distorted octahedral geometry. The most important features in the crystal structure of this compound are the presence of ion-pairing, metal-ligand coordination and a large number of O-H…O, O-H…N, N-H…O, N-H…N and C-H…O hydrogen bonds.

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catena-Poly[diaquabarium(II)-μ-aqua-κ²O:O-di-μ-1-oxopyridinium-2-thioacetatao-κ⁴O:O trihydrate], [Ba(C₇H₆O₃NS)₂^-(H₂O)₃]_n·3nH₂O was synthesized and the crystal structure was determined by a single-crystal X-ray diffraction method. The title complex crystallizes in orthorhombic space group P2₁2₁2₁ with unit-cell parameters a = 7.7217(1)Å, b = 14.4052(2)Å, c = 19.9285(2)Å, V = 2216.70(5)ų. The final R value is 0.0143 for 3179 measured reflections. The central barium(II) metal makes coordination with ten oxygen atoms, and forms a polymeric chain by Ba-O-Ba links in the crystal.

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The title compound, C₁₉H₂₀N₄OSCl₂, crystallizes in the monoclinic system, space group P2₁/c, with cell constants a = 15.470(3)Å, b = 9.577(2)Å, c = 14.615(3)Å and Z = 4. The piperazine ring adopts a chair conformation. A weak conjugation effect of the lone pair of the tertiary N atom with the π-electron system of the phenyl ring is observed. The molecular packing is influenced by the C-H…O and C-H…N intermolecular hydrogen bonds.

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The title compound, C₁₅H₁₄O₃, crystallizes in the orthorhombic system, space group Pbcm, with cell constants a = 9.751(3)Å, b = 18.136(6)Å, c = 7.004(2)Å and Z = 4. The 1-(2-hydroxy-4-methoxyphenyl)ethanone part of the molecule is located on the crystallographic mirror plane. The strong intramolecular hydrogen bond O17-H17…O1 is observed. The molecular packing is influenced by the presence of π…π interactions.

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The title Cu complex with a tetradentate ligand, 1,2-bis(8-hydroxyqunoline-2-yl)ethane, was prepared and its crystal structure was determined by X-ray crystallography. The complex crystallizes in the triclinic system, space group P1 with with a = 8.1092(5), b = 9.2241(5), c = 10.8119(2)Å, α = 72.35(1), β = 79.13(2), γ = 81.53(2)°, V = 753.33(10)ų, Z = 2. The copper atom is coordinated by two N atoms and two O atoms of two 8-quinolinolate moieties to form a significantly distorted tetrahedral geometry in the cis configuration.

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The title compound, CoCl₂(C₁₂H₁₆N₂)₂, was synthesized from 1-pentylbenzimidazole and cobalt dichloride in ethanol. It crsytalizes in the trigonal space group R-3. The unit-cell parameters at room temperature are a = 26.9966(2), c = 18.7665(2)Å, V = 11844.92(18)ų, D_x = 1.278 g/cm³, Z = 18. The crystal structure is stabilized by intermolecular C7-H7…Cl1 hydrogen interactions.

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The synthesis and crystal structure of a new monophosphate, (C₁₂H₁₉N₂)H₂PO₄·H₂O, are discussed, based on an X-ray crystal structure investigation. This compound crystallizes in the monoclinic system, with the space group P2₁/c and the following parameters: a = 15.226(2), b = 6.984(3), c = 15.359(5)Å, β = 95.44(2)°, Z = 4 and V = 1625.8(9)ų. The crystal structure was determined and refined to R = 0.0483 using 2208 independent reflections. The atomic arrangement of this compound is built up by (H₄P₂O₈)^2- dimers. Each dimer aggregates with water molecules to form inorganic layers, in the x = 1/2 planes, through hydrogen-bond interactions. Between those layers, the organic cations (C₁₂H₁₉N₂)⁺ are oriented in a similar direction, so that they form intermolecular van der Waals interactions and, particularly, strong hydrogen bonds with oxygen atoms of the anionic layers.

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The title compound I, C₂₁H₁₄ClNO, was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the monoclinic crystal system and the space group P2₁/c with cell parameters a = 14.158(2)Å, b = 6.9362(12)Å, c = 15.660(3)Å, β = 96.608(3)°, Z = 4 and V = 1527.6(4)ų. The nitrogen, C(13), C(14) and C(15) atoms in the structure are coplanar and π-delocalization exists in I. The tautomer enamino ketone of I is stablized by both π-delocalization and intra-molecular hydrogen bonds.

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Herein we report on the single-crystal structure of the macrocyclic complex [Co^III(dohpn)(CN)₂]·H₂O (dohpn = 2,3,9,10-tetramethyl-1,4,8,11-tetraazaundecane-1,3,8,10-tetraen-11-ol-1-olate). The compound crystallizes in the space group P2₁ with cell parameters a = 7.4632(2), b = 13.9015(4), c = 7.9286(2)Å, β = 101.6420(10)° and Z = 2. The structure shows an octahedral environment around the metal ion with a fairly planar configuration of the macrocyclic ligand and a very small tetragonal distortion of the complex.

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The title compound, C₂₀H₂₀O₈Sn, shows six-coordinated tin atom and reveals a monomeric molecule. The structure is best described as skew trapezoidal bipyrimadal and the ligand is coordinated to tin in an anisobidentate mode.

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The title compound, 4,4′-dichloro-2,2′-[(1,4-butylene)dioxybis(nitrilomethylidyne)]diphenol, was synthesized and characterized by single-crystal X-ray diffraction. It crystalizes in the monoclinic system, space group P2₁/n with a = 4.9390(7)Å, b = 30.235(3)Å, c = 6.1349(14)Å, β = 90.818(2)°, Z = 2, V = 916.0(3)ų; the final residual factor is R = 0.0458 for 1613 measured reflections. The intramolecular O-H…N hydrogen bonds are dominantly effective in stabilizing the crystal structure.

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The title complex was serendipitously obtained by reacting dipicolinic acid, 1,10-phenanthroline, and iron(III) perchlorate hexahydrate in ethanol. Single crystals were grown by allowing the sealed reaction mixture to stand for two weeks, thus yielding the increasingly structurally characterized tris(1,10-phenanthroline)iron(II) cation.

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The title compound, 4-acetoxy-3-[1-(4-nitrophenyl)-3-oxobutyl]-2H-1-benzopyran-2-one, C₂₁H₁₇NO₇, crystallized in the monoclinic system, space group P2₁/a, with cell constants a = 9.5505(13)Å, b = 11.9546(11)Å, c = 16.336(2)Å, β = 97.497(12)°, V = 1849.2(4)ų and Z = 4. The compound crystallized in the open-chain keto form and had only one asymmetric center at C 15.

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The X-ray structure of the salt N-(4-nitrophenacyl)-4,5-diazafluoren-9-onium bromide 1, in the form of an acetic acid solvate, is reported. The compound crystallizes in the space group P1 with a = 6.2483(1)Å, b = 11.8182(2)Å, c = 14.8931(3)Å, α = 67.543(1)°, β = 86.754(1)°, γ = 79.304(1)° and Z = 2. The quaternization of a nitrogen atom of the 4,5-diazafluoren-9-one molecule, manifested in the title cation, introduces significant asymmetry, reflected in differences in the geometries of the two pyridyl moieties. In constrast to related, previously reported tetracyclic systems that display a high degree of helical distortion, steric congestion in the title cation is minimal, rendering the 4,5-diazafluoren-9-onium moiety virtually planar. This is consistent with predictions based on NMR spectroscopy.

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A novel two-dimensional manganese(II) azide complex with N-methyl-imidazole, [Mn(N-methyl-imidazole)₂ (μ_1,3-N₃)₂]_n, was synthesized. The title complex was crystallized in the monoclinic system, space group P2₁/n with a = 6.5886(3)Å, b = 6.3101(3), c = 14.8922(7)Å, β = 94.301(1)°, V = 617.40(5)ų and Z = 2. The structure consists of an extended two-dimensional layer of octahedrally coordinated centrosymmetric manganese atoms, bridged by means of μ^1,3-N³ ligands.

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The title compounds, 1-thiocarbamoyl-3,5-di(2-thienyl)-2-pyrazoline, C₁₂H₁₁N₃S₃, crystallizes in the monoclinic space group C2/c with the following unit-cell parameters: a = 23.6982(18)Å, b = 7.9154(6)Å, c = 16.7132(14)Å, β = 124.719(6)° and V = 2576.9(4)ų. The crystal structure was solved with a final R = 0.0297 using 3030 independent reflections. The molecule is composed of a pyrazoline moiety containing two thiophene groups, which are oriented in opposite directions. The pyrazoline rings adopt an envelope conformation, and the N atom is involved in an intermolecular N-H…N (pyrazoline) hydrogen bond. Also, the crystal structures are stabilized by intra and intermolecular hydrogen bonds, as well as C-H…π stacking interactions.

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The title compound, C₁₇H₁₄Cl₂O₄, 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 = 14.671(2)Å, b = 7.7600(6)Å, c = 15.766(2)Å, β = 115.704(3)°, Z = 4 and V = 1617.3(3)ų. The structure exhibits a weak intermolecular hydrogen bond of the type C-H…O. The carbonyl bond lengths of ketone and the ester groups are slightly different.

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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 P2₁/c with cell parameters a = 7.541(4)Å, b = 17.958(8)Å, c = 8.091(4)Å, β = 111.16(4)° and Z = 4. The geometry around the S atom is distorted tetrahedral. The structure exhibits intermolecular hydrogen bonds of the type C-H…O.

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The bis ethylenediammonium bromide hexabromobismuthate (III) monohydrate salt is monoclinic P2₁/a with the following unit-cell dimensions: a = 11.960(6)Å, b = 13.993(2)Å, c = 12.272(6)Å, β = 92.10(2)° and Z = 4. The structure consists of [NH₃(CH₂)₂NH₃]²⁺ cations and isolated anionic clusters, [BiBr₇(H₂O)]^4-. These entities are linked together through N-H…Br and N-H…O(W) hydrogen bonds, originating from the [NH₃(CH₂)₂NH₃]²⁺ groups, and forming a three-dimensional network.

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N-[5-Methylisoxazole amino-3-yl]-3,5-di-tert-butylsalicylaldimine [C₁₉H₂₆N₂O₂] was synthesized by the reaction of 3,5-di-tert-butylhydroxybenzaldehyde in absolute ethanol and 3-amino-5-methylisoxale in ethanole. Its structure was determined by X-ray crystallography. It crystallized in the monoclinic system, space group P2₁/n, with lattice parameters a = 9.024(2)Å, b =22.592(10)Å, c = 9.782(3)Å, β = 116.548(2)°, Z = 4, μ = 0.601 mm^-1, s = 1.013, R = 0.054 and wR = 0.110 for 2949 observed reflections. The structures were solved by direct methods using the SHELX-97 program and refined on F². The compound has four intramoleculer and three intermolecular contacts.

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The title compound, N,N′-bis(trans-cinnamaldehyde)ethylenediimine (ca₂en), C₂₀H₂₀N₂, was synthesized and structurally characterized by single-crystal X-ray diffraction. The compound crystallizes with two formula units in the monoclinic space group P2₁/c with lattice parameters (295 K) of a = 13.542(3), b = 7.6459(17), c = 8.1023(18)Å and β = 96.043(4)°. The molecule lies across a crystallographic inversion centre and has a trans configuration (E, E).

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In the title compound, [Ag(NO₃)(C₅H₅N₂Br)₂], the Ag atom is three coordinate in a highly distorted trigonal planar environment formed by two N atoms of 2-amino-5-bromopyridine and one O atom of a nitrate anion. In the crystal structure, there are four intermolecular interactions, i.e. N(4)-(4)…O(1) and N(2)-(2)B…O(1).

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In the crystal structure of the title compound, [CuI(C₅H₇N₃)]_n, the Cu and I atoms form Cu-I double polymeric chains in which each Cu atom is coordinated in a distorted tetrahedral manner by three I atoms and the pyridine N atom of a 2,6-diaminopyridine ligand.

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The title compound, 1-N-ethylthiocarbamoyl-3,5-di(2-thienyl)-2-pyrazoline, C₁₄H₁₅N₃S₃, crystallizes in the triclinic space group P1 with the following unit-cell parameters: a = 10.7560(7)Å, b = 11.4836(8)Å, c = 13.3007(9)Å α = 77.048(5)° β = 85.563(5)°, γ = 78.261(5)° and V = 1566.72(18)ų. The crystal structure was solved with a final R = 0.0358 using 5848 independent reflections. There are two molecules in the asymmetric unit and the title compound is composed of a pyrazoline moiety containing two thiophene groups, which are oriented in opposite directions. The structure of the title compound contains two molecules in the asymmetric unit. The crystal structures are stabilized by intra and intermolecular hydrogen bonds, and C-H…π stacking interactions.

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Crystals of the title compound, ethyl (Z)-2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-3-phenyl-2-propenoate, C₁₉H₁₅NO₄, M_r = 321.32 are monoclinic, space group P2₁/n, with a = 6.172(2), b = 8.029(2), c = 32.664(6)Å, β = 91.79(3)°, V = 1617.9(7)ų and Z = 4 at T = 100(2)K. The crystal packing is stabilized by an extensive three-dimensional system of C-H…O/π contacts with some oxygen atoms involved in trifurcated, four-centered interactions.

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The crystal structure of [Cu₂L₂(DMF)₂]·2DMF (H₂L =2,4-bis[(2′-carboxyphenoxy)methyl]-1,3,5-trimethylbenzene) was determined by an X-ray diffraction method. This complex crystallized in the monoclinic space group P2₁/n, with, a = 15.528(5), b = 10.052(3), c = 21.035(6)Å, β = 103.697(4)°, Z = 2, V = 3091.3(16)ų, and R = 0.0621. Each Cu(II) ion is coordinated by four carboxylate O donor atoms from two ligands and by O donor atoms from the solvent molecule, DMF. The whole molecule looks like an Arabic number, ‘8’. A 2-D porous sheet was constructed by intermolecular hydrogen bonds between neighboring 8-shaped units.

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The crystal structure of 5-phenyl-2-thioxo-4-imidazolidinone has been determined by X-ray diffraction. The crystal, C₉H₈N₂OS, belongs to space group P1 with cell dimensions of a = 8.971(3)Å, b = 9.651(3)Å, c = 10.497(3)Å, α = 82.39(2)°, β = 80.15(2)°, γ = 79.16(2)°. The final R value is 0.045 for 2683 reflections (I > 2.00σ(I)). There are two independent molecules, A and B, in the asymmetric unit. The molecules differ mainly in the orientation of the phenyl ring with respect to the five-membered ring. In crystals, the thioamide groups of molecules A and B form centrosymmetric dimers A-A and B-B via the N-H…S hydrogen bonds. The amide groups of two neighboring molecules, A and B, form pseudo-centrosymmetric dimers A-B through N-H…O hydrogen bonds.

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