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The mol-ecular structure of the title salt, C₁₁H₁₂N₃O₃ ⁺·Br^-, reveals near co-planarity between the the imidazole and 4-nitro-benzene moieties with a dihedral angle of 8.99 (14)° between their planes. A prominent feature in the mol-ecular packing is the bromide anion acting as a double acceptor for O-H⋯Br and C-H⋯Br hydrogen-bonds, leading to a linear chain propagating along [110]. The crystal studied was refined as an inversion twin, with the minor component = 0.081 (8).

In the title compound, C₂₂H₁₇N₃O, the N atoms of the pyridine rings exhibit a typical trans-trans arrangement: the dihedral angles between the central pyridine ring and the peripheral rings are 22.24 (4) and 2.38 (4)°. In the crystal, pairwise C-H⋯N hydrogen bonds form inversion dimers described by an R ² ₂(6) graph set descriptor, which further inter-act through C-H⋯π and π-π inter-actions, creating a two-dimensional supra-molecular network propagating in the bc plane.

In the hydrated title complex, [Fe(dpa)₂(N₃)₂]·H₂O (dpa is 2,2'-di-pyridyl-amine, C₁₀H₉N₃), the Fe^II ion is coordinated in a distorted octa-hedral manner by two neutral, chelating dpa ligands and two anionic, monodentate azide (N₃ ^-) ions in a cis-configuration. Distortion results from different Fe-N bond lengths [2.1397 (13)-2.2254 (12) Å] and (N-Fe-N) _cis [80.12 (4)-96.72 (5)°] and (N-Fe-N) _trans [166.73 (4)-176.62 (5)°] bond angles. Hydrogen bonds exist between two symmetry-related water mol-ecules as hydrogen donors to the γ-N atoms of azido ligands of two adjacent iron complexes and as acceptors from the amide group of the dpa ligands of two additional iron complexes. The hydrogen-bonding pattern results in eight-membered ⋯H-O-H⋯N⋯ rings and a band-like arrangement of the mol-ecules involved. Additional, weaker hydrogen bonds between the α-N atom of the second azido ligand as acceptors and the amide groups of the second dpa ligands as donors cross-link neighboring bands to layers extending parallel to (001).

The title compound, C₅H₄Cl₂N₂, crystallizes with one mol-ecule in the asymmetric unit. In the crystal, the mol-ecular entities are assembled through strong N-H⋯N hydrogen bonding, forming supra-molecular chains extending along the b-axis direction. These chains are inter-connected by offset π-π stacking inter-actions and consolidated by halogen-π inter-actions. The mol-ecular inter-actions were qu-anti-fied by Hirshfeld surface analysis, showing the significant contributions of Cl⋯H/H⋯Cl (40.1%), H⋯H (15.7%) and N⋯H / H⋯N (13.1%) inter-actions. Energy framework analysis using the CE-B3LYP/6-31 G(d,p) basis set revealed that Coulombic inter-actions make a considerable contribution to the total energy and crystal packing.

The solvated title compound, (C₁₈H₁₆P)[CoCl₃(C₁₈H₁₅P)]·2C₆H₆, is the tri-phenyl-phospho-nium salt of an anionic Co^II chlorido coordination compound; the asymmetric unit features an ion-pair and two benzene solvent molecules. One of the solvent mol-ecules shows rotational disorder. C-H⋯Cl and P-H⋯Cl contacts connect the individual constituents into infinite chains extending parallel to [010].

The title compound, C₅H₂Cl₃NO, is almost planar. In the crystal, the mol-ecules form centrosymmetric hydrogen-bonded dimers through pairwise O-H⋯N inter-actions to generate R ² ₂(8) loops.

The title compound, C₁₀H₁₄N₂Se, was prepared from a semicarbazone and selenium dioxide. The planes of the heterocycle and the cis double bond are almost mutually orthogonal and the hexa-methyl-ene tether is nearly strain-free.

In the title compound, di-phenyl-tin(IV) diiso-thio-cyanate, [Sn(NCS)₂(C₆H₅)₂] _n or Ph₂Sn(NCS)₂, comparatively long tin-nitro-gen and short tin-sulfur bonds prove that the ambidentate iso-thio-cyanate ion acts as a bridge between two neighboring, octa-hedrally coordinated tin atoms. As a result, the mol-ecules lose their individuality in favor of a layered coordination polymer that represents a new type of mol-ecular inter-actions in the structural chemistry of diorganotin(IV) dihalides/pseudohalides. The tin atom is located on a center of inversion.

The title racemic oxopyrrolidine compound, C₁₃H₁₇NO₅, contains three stereogenic centres and crystallizes with two mol-ecules in the asymmetric unit. The five-membered pyrrolidine rings in both mol-ecules exhibit envelope conformations. The N-ethyl group of one of the mol-ecules is disordered over two sets of sites in a 0.836 (4):0.164 (4) ratio. In the crystal, both mol-ecules form inversion dimers through pairwise O-H⋯O hydrogen bonds, generating R ² ₂(10) loops, which are linked into a three-dimensional network by weak C-H⋯O hydrogen bonds.

The title compound, C₁₄H₈Cl₂F₃NO, was synthesized by the condensation between tri-fluoro-methyl-aniline and di-chloro-salicyl-aldehyde by nucleophilic addition, forming a hemiaminal, followed by a dehydration to generate an imine. The compound crystallizes in an ortho-rhom-bic Pbca (Z = 8) space group with a dihedral angle of 44.70 (5)° between the two aromatic rings. In the crystal, the mol-ecules pack together to form a zigzag pattern along the c axis.