The title compound, C₂₇H₂₇N₃O₂, was synthesized and the structure was investigated by X-ray crystallography. The compound crystallizes in the tetragonal space group I4₁/a with cell parameters a = 27.7990(6)Å, c = 12.1800(8)Å, V = 9412.5(7)ų and Z = 16. The structure reveals that the pyrazine ring is in a chair conformation. The molecule exhibits both inter and intra-molecular hydrogen bonding of the type C-H…O and N-H…N.

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The crystal structure of 4-bromo benzoylmethylenediphenyldiphenylphosphinomethylphosphorane was determined by X-ray crystallography. The compound crystallized in a monoclinic system and was characterized thus: P2₁/c, a = 13.3489(16)Å, b = 18.933(2)Å, c = 11.3211(14)Å, β = 101.735(2)°, Z = 4, V = 2801.4(6)ų. The crystal was solved by direct methods and refined by full-matrix least-squares on F² to final values of R₁ = 0.0379 and wR₂ = 0.0682.

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The nickel(II) complex [Ni(bmoen)₂(DMF)](BPh₄)₂·DMF [bmoen = bis(2-methoxyethyl)amine, DMF = N,N-dimethylformamide], was synthesized and characterized by single-crystal X-ray analysis. The compound crystallizes in the monoclinic spaces group P2₁/n and Z = 4 with cell parameters a = 11.690(2)Å, b = 29.013(5)Å, c = 17.856(3)Å, β = 90.345(2)°, V = 6056(2)ų. One of the bmoen ligands works as a tridentate ligand in a fac (facial) form, and the other bmoen ligand works as a bidentate ligand.

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The title compound, a dinuclear rhodium(II) complex with pivalic acid (Hpiv), [Rh₂(piv)₄(Hpiv)₂], was isolated, and the crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the monoclinic space group P2₁/c with a = 9.465(2)Å, b = 18.222(5)Å, c = 11.743(3)Å, β = 99.450(5)°, V = 1998.0(9)ų, D_x = 1.354 g/cm³, and Z = 2. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0420 and 0.1095, respectively, for all 4413 independent reflections. The molecule is a tetrakis(μ-pivalato)-bridged dinuclear rhodium(II) complex with a Rh-Rh distance of 2.3858(7)Å, having an elongated square-pyramidal coordination geometry with the O₄ basal atoms from the four bridging piv- ligands and the apical O atom from the Hpiv ligand.

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A mononuclear terbium(III) complex, [TbL¹] [H₃L¹ = tris(2-(2-hydroxy-3-methylbenzylideneamino)ethyl)amine, was synthesized and characterized by single-crystal X-ray analysis. The compound crystallizes in a trigonal system, space group P3 and Z = 2 with cell parameters of a = 12.2874(4)Å, c = 10.8085(5)Å, V = 1413.24(9)ų. A crystal structure analysis revealed that the complex is pseudo-helical, and that the Schiff-base behaves as a tri-deprotonated heptadentate ligand, encapsulating the metal ion within the N₄O₃ cavity.

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The crystal structure of pyridinyl-2-methylene-4-aminobenzoic acid, C₁₃H₁₀N₂O₂, shows the expected stereochemistry trans around the C=N double bond. On the other hand, hydrogen bonds play an important role concerning geometrical aspects of molecules in the solid state. From this point of view, the methanimine moiety of the disubstituted C=N bond provides intermolecular interactions through hydrogen bonds with polarizable acceptor atoms included on the terminal substituents. The molecule shows an intermolecular COOH…N hydrogen bond. The unequal distribution of the double-bond character among the C and N atoms of the methanimine group indicates delocalization of the π electrons over the C=N moiety towards the terminal substituents.

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The solid-state reactions of Li₂CO₃, CeCl₃·7H₂O and H₃PO₄ lead to a new lithium cerium polyphosphate, LiCe(PO₃)₄. This polyphosphate crystallizes in the monoclinic system with a C2/c space group. It was analyzed at room temperature using X-ray diffractometer data. The unit-cell parameters are a = 16.520(7)Å, b = 7.088(4)Å, c = 9.831(4)Å, β = 126.290(2)°, Z = 4 and V = 927.8(8)ų. The crystal structure was refined based on 2875 independent reflections with I > 2σ(I). Final values of the reliability factors were improven considerably: R = 0.011 and Rw = 0.013. This mixed-metal rare-earth polyphosphate consists of a three-dimensional framework in which zigzag [(PO₃)_n]^n- chains with a periodicity of four PO₄ tetrahedra are connected through Li⁺ and Ce³⁺ ions. In this structure both Ce and Li occupy special positions (Wyckoff position 4e, site symmetry 2).

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The title compound, dinuclear rhodium(II) complex with di-N,N′-p-tolylformamidinate ion (form^-) and acetonitrile [Rh₂(form)₄(CH₃CN)]·2H₂O, was isolated from the CH₂Cl₂-CH₃CN solution containing equimolar amounts of [Rh₂(form)₄] and 1,4-dicyanobenzene (1,4-dcb), and the crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the tetragonal space group P4/ncc with a = 16.275(3)Å, c = 23.955(6)Å, V = 6345(2)ų, D_x = 1.231 g/cm³, and Z = 4. The R1 and wR2 values are 0.0437 and 0.1402, respectively, for 3250 reflections. The crystal consists of tetrakisformamidinato-bridged rhodium(II) dimers with a Rh-Rh distance of 2.4750(10)Å, CH₃CN molecules axially coordinating to the rhodim(II) dimer with a Rh-N distance of 2.119(7)Å, and crystal waters. The crystal does not include 1,4-dcb, showing that 1,4-dcb did not work to link the rhodium(II) dimer.

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The novel 5-(3-dimethylane-p-tolylsulfonyl)-propyl-3-(4-flurophenyl)-isoxazole was synthesized and the compound was characterized by spectroscopic techniques and finally confirmed by X-ray diffraction studies. The title compound crystallizes in the triclinic crystal class in the space group P1 with cell parameters a = 5.9350(6)Å, b = 10.1850(14)Å, c = 14.8270(2)Å, α = 104.938(4)°, β = 97.960(8)°, γ = 90.933(6)° and Z = 2. The isoxazole ring is planar. The molecular structure exhibits intermolecular hydrogen bonds of the type C-H…O. The final residual factor is R₁ = 0.0433.

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1,3,5-Trimethylpyridinium iodide was synthesized, and the structure was investigated by X-ray crystallography. The compound crystallizes in the Orthorhombic crystal system in the space group Cmcm with cell parameters a = 8.9850(9), b = 15.767(2), c = 6.9940(6)Å, Z = 4, R₁ = 0.0215. The 1,3,5-trimethylpyridinium cation is on a crystallographic mirror plane, and another perpendicular mirror plane bisects the molecule. The pyridinium cation has C2v symmetry and a quarter of the molecule is independent.

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The crystal structure of lanthanum-lithium polyphosphate LiLaP₄O₁₂ has been determined by single-crystal X-ray diffraction data. This phosphate crystallizes in a monoclinic system with the C2/c space group. At 298 K, the unit-cell dimensions are a = 16.355(5)Å, b = 7.040(5)Å, c = 9.678(5)Å, β = 126.137(5)°, V = 899.932(5)ų, D_x = 3.408 g/cm³, and Z = 4. The crystal structure was solved from 2102 X-ray independent reflections with final R = 0.0377 and R_w = 0.0347 refined with 83 parameters. With regard to the atomic arrangement, it can be described as a long-chain polyphosphate organization. Besides, two infinite (PO₃)∝ chains with a period of eight tetrahedral run along the [110] direction. As for the structure of LiLaP₄O₁₂, it consists of LaO₈ polyhedral sharing oxygen atoms with a phosphoric group, PO₄. Each Li⁺ ion is bonded to six oxygen atoms.

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The addition of trans-bis[4-methoxyphenyl(3-methylbutyl)dithiophosphinato]nickel(II) with pyridine (py) gave the {bispyridine-bis[4-methoxyphenyl(3-methylbutyl)dithiophosphinato]}nickel(II) [Ni(Py)₂(L)₂] complex. The structure of the complex has been characterized by X-ray diffraction. Ni(II)dithiophosphinato complex was reported¹ to be of squareplanar geometry while the latter compound was of a octahedral coordination geometry. It crystallizes in monoclinic system, space group P2₁/n, with lattice parameters a = 12.4968(12)Å, b = 9.7051(10)Å, c = 16.0975(17)Å, (β = 101.734(8)°, Z = 2, (μ = 0.84 mm^-1, S = 1.003, R = 0.0437 and wR = 0.1017 for 3562 observed reflections. The structure was solved by direct methods using the SHELX-97 program and refined on F².

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The title compound crystallizes in the monoclinic space group P2₁/c, with cell parameters a = 6.493(5), b = 11.560(6), c = 13.384(8)Å, β = 118.19(5)°, V = 885.4(10)ų and Z = 4. Its crystal structure was determined and refined to a final R = 0.073 (R_w = 0.209) for 2534 independent reflections. In the crystal, the 3-ammoniomethyl pyridinium cations are anchored between clusters formed by sulfate anions and water molecules via N-H…O hydrogen bonds to build an infinite layer parallel to the bc plane at x = 1/2. Crystal cohesion and stability are supported by electrostatic and π-π interactions which, together with hydrogen bonds, build up a three-dimensional network.

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The title compound, a chain adduct of rhodium(II) pivalate with trans-1,2-bis(4-pyridyl)ethylene (bpel), [Rh₂(piv)₄(bpel)]·4CH₃CN, was isolated, and the crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the orthorhombic space group Immm with a = 12.010(4)Å, b = 12.371(4)Å, c = 16.193(6)Å, V = 2405.8(14)ų, D_x = 1.321 g/cm³, and Z = 2. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0262 and 0.0659, respectively, for all 1614 independent reflections. The molecule is a linear chain molecule with an alternating arrangement of Rh₂(piv)₄ [Rh-Rh 2.3928(9)Å] and bpel. The adsorption property was confirmed for N₂.

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The crystal structure of Na₂H[(P_0.52As_0.48)O₄]·7H₂O at room temperature belongs to the P2₁/n space group and is isomorphous to Na₂HAsO₄·7H₂O and Na₂HPO₄·7H₂O. The structure was solved and refined with 6310 independent reflections with R₁ = 0.0518 and Rw₂ = 0.0811 by means of Mo K_α radiation. The lattice parameters are: a = 9.3250(7), b = 11.0063(8), c = 10.5602(7)Å, β = 95.530(2)° and Z = 4. This crystal structure is built up from discrete (P,As)O₄^3- tetrahedra connected by O-H…O hydrogen bonds and through the electrostatic actions of the Na⁺ cations. The mean (P,As)-O distance is intermediate between those of P-O, and the As-O distance is not consistent with those of Na₂HAsO₄·7H₂O and Na₂HPO₄·7H₂O.

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A new organic-inorganic hybrid (abbreviated DAOTCC) with the formula C₂₄H₆₆Cl₁₀Co₂N₆ was obtained by the reaction of 1,8-diaminooctane, CoCl₂·6H₂O and hydrochloric acid at room temperature. One of the grown crystals was subjected to X-ray diffraction. The titled compound crystallizes in the monoclinic space group P2₁/c with the cell parameters: a = 12.7153(14)Å; b = 17.5474(11)Å; c = 10.3409(8)Å; β = 91.582(7)°; V = 2306.39(3)ų; Z = 2; R₁ = 0.047; wR₂ = 0.1115 for 3104 observed reflexions. The structure is a 0D hybrid; the organic cations are linked to the inorganic layers by N-H…Cl hydrogen bonds.

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The boron compound, 4,6-di-tert-butyl-2-mesitylbenzo-[d][1,3,2]dioxaborole, was isolated and the molecular structure was determined by a single crystal X-ray diffraction study at 198 K. The compound crystallizes in a monoclinic system, space group P2(1)/n and Z = 4 with cell parameters of a = 15.017(3)Å, b = 9.6038(19)Å, c = 15.896(3)Å, β = 113.712(3)°, V = 2099.0(7)ų. The R₁ [I > 2σ(I)] and wR₂ (all data) values are 0.0430 and 0.1298, respectively, for all 4709 independent reflections. The molecular structure analysis reveals the boron atom lies in a roughly trigonal environment that contains one catecholato group and one mesitylene group.

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The crystal structure is given for the dimethyldodecylhexadecylammonium bis(2-thioxo-1,3-dithiole-4,5-dithiolato)-nickelate(III) complex salt. The compound crystallizes in a triclinic system, spaces group P1 and Z = 2 with cell parameters a = 7.6149(5)Å, b = 12.2245(9)Å, c = 24.2399(17)Å, α = 84.5750(10)°, β = 87.9670(10)°, γ = 86.7670(10)°, V = 2241.7(3)ų. The crystal packing is stabilized by short intermolecular S…S contacts between neighboring [Ni(dmit)₂]-anions and hydrophobic interactions between the countercations.

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The crystal structure of the title compound was determined by single-crystal X-ray diffraction. The compound crystallizes in a monoclinic system and was characterized thus: P2₁/n, a = 8.6189(2)Å, b = 17.9591(7)Å, c = 18.4009(6)Å, β = 102.2560(19)°, Z = 4, V = 2783.32(16)ų. In the mono nuclear macrocyclic complex the copper(II) ion resides at the N(imine)₂O₂ coordination site, whereas the other compartment, N(amine)₂O₂, is occupied by a proton. The geometry around copper(II) is square-planar.

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The compound, 3-(4-ethylphenyl)-1-(2-hydroxy-4-methoxyphenyl)prop-2-en-1-one, was synthesized by using 4-methoxy-2-hydroxyacetophenone and 4-ethylbenzaldehyde solutions. The synthesized compound was characterized by spectroscopic techniques, and finally confirmed by X-ray diffraction studies. The compound is a dimer in nature, and crystallizes in the triclinic crystal class in the space group P1. The cell parameters are a = 9.6860(9)Å, b = 12.6650(17)Å, c = 13.4990(18)Å, α = 68.808(4)°, β = 81.149(7)°, γ = 79.863(7)°, V = 1511.5(3)° and Z = 4. In the crystal, O-H…O hydrogen bonds connect the hydroxy donor group and the C=O acceptor group. The R₁[I > 2σ(I)] and wR₂ (all data) values are 0.0600 and 0.1984, respectively.

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The title compound, 1-(7,8-dimethyl-2-oxo-2H-chromen-4-ylmethyl)-pyrrolidine-2,5-dione, crystallizes in the triclinic system, with a space group P1. The unit-cell parameters: a = 7.309(2)Å, b = 9.677(3)Å, c = 9.746(3)Å, α = 91.096(5)°, β = 100.682(5)°, γ = 102.191(5)°, Z = 2. The pyrrolidine ring is planar, and rotated by 82.36° with respect to the coumarin moiety. The packing of layers is stabilized by C-H…O, C-H…π hydrogen bonds and the π-π stacking interaction.

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The title compound, methyl 2-cyano-3,11-dioxo-urs-1,12-dien-24-oate (C₃₂H₄₃N₁O₄), crystallizes in the orthorhombic space group P2₁2₁2₁ with the following unit-cell parameters: a = 7.8862(2), b = 17.6554(3), c = 20.0326(5)Å, Z = 4. The crystal structure was solved by direct methods, and refined by full-matrix least-squares procedures to a final R-value of 0.0365 for 4164 observed reflections. The dihedral angle between the ester moiety and ring A is 83.9(1)°. Rings B, D and E exist in chair conformations, while rings A and C adopt sofa conformations. The ring junctions A/B and B/C are trans fused, while ring junctions C/D and D/E are quasi-trans and cis, respectively. The methyl carbons located at various positions are significantly deviated above and below the plane of the molecule. The crystal structure is stabilized by intra and intermolecular C-H…O hydrogen bonds.

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The molecular structure of the zirconium compound, (η⁵-C₅H₅)₂Zr(1,2-O₂C₆H₂-3,5-tert-Bu₂), was determined by a single crystal X-ray diffraction study at 198 K. The compound crystallizes in a triclinic system, space group P1 and Z = 4 with cell parameters of a = 16.198(3)Å, b = 17.010(3)Å, c = 21.600(4)Å, α = 102.476(2)°, β = 111.983(2)°, γ = 101.738(3)°, V = 5115.8(16)ų. The R₁ [I > 2σ(I)] and wR₂ (all data) values are 0.0541 and 0.1379, respectively, for all 22221 independent reflections. The molecular structure analysis reveals the formation of dimers where one oxygen atom of the catechato group coordinates to another zirconium atom in an adjacent molecule.

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In the title salt, [C₁₂H₁₄N₂]²⁺, 2[IO₄]^-, the cation is organized around an inversion center located at the centre of the CH₂CH₂ moiety and the two pyridine moieties are placed in anti positions with respect to each other. The I atom is in tetrahedral environment. Three O atoms of anion are involving in some C-H…O interactions with neighboring cations.

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The title compound, dinuclear rhodium(II) pentafluorobenzoate with methanol [Rh₂(O₂CC₆F₅)₄(CH₃OH)₂], was isolated and the crystal structure was determined by the single-crystal X-ray diffraction method at 293 K. It crystallizes in the monoclinic space group P2₁/c with a = 7.889(3)Å, b = 34.808(14)Å, c = 12.983(5)Å, β = 103.930(7)°, V = 3460(2)ų, D_x = 2.139 g/cm³, and Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0319 and 0.0747, respectively, for all 8031 independent reflections. The Rh-Rh distance is 2.3829(9)Å and the axial Rh-O (methanol) distances are 2.2689(19) and 2.254(2)Å. The ¹³C and ¹⁹F NMR spectra showed that the dimer structure is preserved in THF.

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The complex of an isothiocyanato-N,N′-dimethyl-N,N′-bis(pyridine-2-ylmethyl)propane-1,3-diaminecopper(II) perchlorate ([Cu(NCS)(LMe₂)]ClO₄) was prepared. Its crystal structure was determined by X-ray diffractometry. [Cu(NCS)(LMe₂)]ClO₄ crystallized in a triclinic system, and was characterized thus: P1, a = 9.257(3), b = 9.883(4), c = 11.806(5)Å, α = 89.638(12), β = 81.053(10), γ = 88.841(12)°, Z = 2, V = 1066.7(7)ų. The crystal structure was solved by direct methods and refined by full-matrix least squares on F² to final values of R1 = 0.058.

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The title compound, 2-(4-chlorophenyl)-1,4,5-triphenyl-(1H)-imidazole (C₂₇H₁₉N₂Cl), crystallizes in the triclinic space group P1 with the following unit-cell parameters: a = 10.2102(3), b = 10.3193(4), c = 11.2040(4)Å, α = 83.116(3), β = 86.022(3), γ = 66.348(3)° and Z = 2. The crystal structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R-value of 0.0406 for 3039 observed reflections. The phenyl rings and the imidazole ring are planar. The bonds C2-C6, N1-C12, C5-C18 and C4-C24 exhibit significant torsion. The molecules in the unit cell are arranged in layers, and are stabilized by C-H…π interactions. The minimum observed π-π distance is 4.333(1)Å.

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The title compound, 8-(6-chloro-pyridin-3-ylmethyl)-2,6,7,8-tetrahydro-imidazo[2,1-c][1,2,6-chloropyridyl-3-yl-4]triazin-3-one, (C₁₁H₁₂ClN₅O), crystallizes in the monoclinic space group P2₁/n with unit-cell parameters: a = 10.1095(3), b = 10.4038(3), c = 11.9047(3)Å, β = 101.013(3)°, Z = 4. The crystal structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R-value of 0.0391 for 1840 observed reflections. The pyridine ring is held almost perpendicular to the imidazole ring [dihedral angle, 86.27(6)°]. Both the imidazole and triazine rings adopt a halfchair conformation. The crystal structure is stabilized by intermolecular N-H…O, C-H…O and C-H…π hydrogen bonds.

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Trisiloxane-containing alicyclic tetracarboxylic dianhydride was derived from 5-norbornene-endo-2,3-dicarboxylic anhydride and 1,1,3,3,5,5-hexamethyltrisiloxane. This dianhydride could be divided into two crystals with different melting points: 143.5 - 144.5°C and 119.5 - 121.5°C. The crystal system of the low-melting-point dianhydride is triclinic, space group is P1, and number of molecules in a unit cell (Z) is two with lattice parameters a = 14.033(4)Å, b = 15.602(5)Å, c = 7.603(4)Å, α = 101.72(3)°, β = 105.19(3)°, γ = 64.82(2)°. From the finding that (R,R) and (S,S) existed in pairs within a unit cell, it is concluded that this dianhydride is a racemic isomer.

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Two different tautomeric forms, namely the keto [1-phenyl-3-(propan-2-yl)-1,2-dihydro-pyrazol-5-one] and the enol form, [1-phenyl-3-(propan-2-yl)-1H-pyrazol-5-ol], C₁₂H₁₄N₂O·2C₁₂H₁₄N₂O, are present in the crystal in a 1:2 ratio. During crystallization, 1-phenyl-3-(propan-2-yl)-1,2-dihydro-pyrazol-5-one undergoes tautomerization to afford a corresponding enol via proton transfer reaction. The compound crystallizes in the triclinic space group P1 with the following unit-cell parameters: a = 11.1593(3)Å, b = 11.2247(3)Å, c = 14.1140(4)Å, α = 73.333(3)°, β = 88.286(2)°, γ = 82.767(2)°, Z = 2. The crystal structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R-value of 0.0405 for 4611 observed reflections. The dihedral angles between the mean planes through the phenyl ring and the pyrazole ring are: 28.04(5)°, 47.38(5)° and 49.32(6)° for molecules I, IIA, IIB, respectively. The crystal structure is stabilized by intermolecular N-H…N, O-H…O, O-H…N, C-H…O and C-H…π hydrogen bonds.

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The structure of methanesulfonate salt of 3-(N-methyl)pyridinium boronic acid, [3-(N-Me)PyB(OH)₂]CH₃SO₃, was determined by X-ray crystallography. The boronic acid salt existed in crystals as a monomeric form with a pair of strong O-H…O-S hydrogen bonds, and was characterized as: P2₁/c, a = 8.9460(18), b = 8.8380(18), c = 13.850(3)Å, β = 105.28(3)°, Z = 4, V = 1056.3(4)ų.

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The title compound, bis(3,4-dihydroisoquinolin-2(1H)-yl)methanethione (C₁₉H₂₀N₂S), crystallizes in the orthorhombic space group Pbcn with the following unit-cell parameters: a = 4.8145(3), b = 12.6749(9), c = 26.292(2)Å, Z = 4. The final reliability factor is R = 0.0366 for 1441 observed reflections, and the goodness of the fit is equal to 1.015. The molecule lies on a crystallographic twofold axis that is coincident with the C=S bond. The N-containing six-membered ring adopts a half-chair conformation. The crystal structure consists of a polymeric arrangement of molecules linked through C-H…S interactions.

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A new complex of an isothiocyanato-N,N′-diethyl-N,N′-bis(pyridine-2-ylmethyl)propanediaminecopper(II) perchlorate ([Cu(NCS)(LEt₂)]ClO₄) was prepared. Its crystal structure was determined by single-crystal X-ray diffractometry. [Cu(NCS)(LEt₂)]ClO₄·0.5H₂O crystallized in a monoclinic system, and was characterized thus: C2/c, with a = 20.8501(10), b = 17.2174(9), c = 15.0630(7)Å, β = 119.049(3)°, Z = 8, V = 4727.2(4)ų. The crystal structure was solved by direct methods and refined by full-matrix least squares on F² to final values of R1 = 0.0585.

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3,8-Dibromo-3-(bromomethyl)-3,3a,4,5,6,6a-hexahydro-6a-hydroxy-6,9a-dimethylazuleno[4,5-b]furan-2,9-dione (C₁₅H₁₇Br₃O₄) crystallizes in the monoclinic space group P2₁ with unit-cell parameters: a = 7.9170(6)Å, b = 10.7305(6)Å, c = 10.4145(8)Å, β = 109.246(9)° and Z = 2. The crystal structure was solved by direct methods, and refined by full-matrix least-squares to a final R-value of 0.0477 for 2341 observed reflections. The seven-membered ring assumes a twist chair conformation, while the two five-membered rings exhibit envelope conformations. The ring junction A/B is trans fused, while ring junction B/C is cis fused. The characteristic pattern observed in the packing diagram has the appearance of twisted chains of molecules packed together to form layers.

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The title compound, an adduct of rhodium(II) benzoate [Rh₂(bz)₄] with pyrimidine (pym) and acetonitrile, [Rh₂(bz)₄-(pym)]_2n·n[Rh₂(bz)₄(CH₃CN)₂]·2nCH₃CN, was isolated, and the crystal structure was determined by the single-crystal X-ray diffraction method at 90 K. It crystallizes in the triclinic space group P1 with a = 10.728(2)Å, b = 15.002(3)Å, c = 15.860(3)Å, α = 68.321(3)°, β = 82.549(4)°, γ = 85.492(4)°, V = 2350.5(8)ų, D_x = 1.692 g/cm³, and Z = 1. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0460 and 0.1074, respectively, for all 10430 independent reflections. The crystal contains zigzag chain molecules with an alternating arrangement of Rh₂(bz)₄ [Rh-Rh 2.3914(9), 2.3946(9)Å] and pym, diacetonitrile adduct molecules Rh₂(bz)₄(CH₃CN)₂ [Rh-Rh 2.3951(10)Å], and acetonitrile molecules.

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The nickel(II) complex [Ni(DMF)₆](BPh₄)₂ [DMF = N,N-dimethylformamide] was accidentally formed from [Ni(bmoen)₂-(DMF)](BPh₄)₂·DMF [bmoen = bis(2-methoxyethyl)amine] by its decomposition during a recrystallization procedure, which was from a mixture of DMF and 2-propanol (1:1). The obtained crystal was characterized by single-crystal X-ray analysis. The compound crystallizes in the orthorhombic spaces group Pca2₁ and Z = 4 with cell parameters a = 30.2714(5)Å, b = 9.2644(1)Å, c = 22.0462(4)Å, V = 6182.8(2)ų. Six DMF molecules coordinate to a nickel(II) center, and the complex cation can be approximately classified into an S₆ point group; its coordination geometry is trigonally compressed.

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The title polymer compound of rhodium(II) formamidinate with toluene as crystal solvents [Rh₂(form)₄(1,4-dib)]_n·2n(toluene) (form^- = N,N′-di-p-tolylformamidinate anion; 1,4-dib = 1,4-diisocyanobenzne) was isolated, and the crystal structure was determined by the single-crystal X-ray diffraction method at 123 K. It crystallizes in the orthorhombic space group P2₁2₁2₁ with a = 11.5161(16)Å, b = 20.946(4)Å, c = 28.944(4)Å, V = 6981.7(16)ų, D_x = 1.343 g/cm³, and Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0441 and 0.0744, respectively, for all 16061 independent reflections. The Rh-Rh distance is 2.5702(5)Å and the axial Rh-C (dib) distances are 2.041(3) and 2.050(3)Å. The polymer chain with the alternated arrangement of rhodium(II) dimer and 1,4-dib extends along the c axis in the crystal, slightly tilting with respect to the axis.

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A crystalline complex of bis(benzophenone) azine (BBA), solvated by benzene in a BBA:benzene = 1:1 ratio, was isolated as yellow crystals, and its crystal structure was determined by single-crystal X-ray diffraction analysis at 223 K. The complex crystallizes in the triclinic crystal system in the space group P1 (#2) with the cell parameters a = 8.646(6)Å, b = 9.096(5)Å, c = 9.217(6)Å, α = 78.01(2)°, β = 64.23(2)°, γ = 67.39(2)°, Z = 1, and V = 601.9(6)ų. Benzene is embedded in a channel running along the c-axis. The yellow color of the complex, in contrast to the colorless solvent-free crystals, is attributed to the planar geometry of the C=N-N=C moiety.

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