metal-organic compounds
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The dinuclear compound, [Nb2Cl6(C2H6S)1.7(C2H6Se)1.3], features an NbIII=NbIII double bond [2.6878 (5) Å]. The molecule lies on a twofold rotation axis that passes through the middle of this bond as well as through the bridging dimethyl sulfide ligand. The NbIII ion exists in an octahedral coordination environment defined by two terminal and two bridging Cl atoms, and (CH3)2Se/(CH3)2S ligands. The (bridging) ligand lying on the twofold rotation axis is an ordered (CH3)2S ligand, whereas the terminal ones on a general position are a mixture of (CH3)2Se and (CH3)2S ligands in a 0.647 (2):0.353 (2) ratio (the methyl C atoms are also disordered).
metal-organic compounds
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The AgI atom in the polycationic salt, {[Ag(C11H11N3O)]NO3}n, shows a linear coordination [N—Ag—N = 175.0 (2)°]; the polymeric nature arises from bridging by the pyrazine portion of the ligand, resulting in chains extending parallel to [100]. The NO3− counter-ions surround the polymeric chain and interact only weakly with it [AgO = 2.701 (4) and 2.810 (5) Å]. Adjacent chains are linked into a three-dimensional network by O—HO and N—HO hydrogen bonds.
metal-organic compounds
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The CuII atoms in the title coordination polymer, {[Cu(C13H11N4O)(C2N3)]·H2O}n, are N,N′,O-chelated by the deprotonated Schiff base ligands, and adjacent metal atoms are bridged by the dicyanamide ions, generating a polymeric chain that propagates along the b axis. The two independent metal atoms show a square-pyramidal N4O coordination. The two independent water molecules are disordered over two positions; each water molecule is a hydrogen-bond donor to a carbonyl O atom. Weak N—HN hydrogen bonding is also observed.
metal-organic compounds
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The CuII atom in the title compound, [Cu(C13H11N4O)(NCO)], is N,N′,O-chelated by the mono-deprotonated Schiff base ligand and it is also covalently bonded to the nitrogen end of the cyanate ion. The CuII atom shows a square-planar coordination that is distorted towards square-pyramidal owing to an intermolecular CuNcyanate interaction [2.623 (2) Å], which gives a centrosymmetric dimer. In the square-planar description, the CuII atom is displaced out of the square plane [r.m.s. deviation = 0.048 Å] by 0.084 (1) Å in the direction of the apical occupant. In the crystal, adjacent complex dimers are linked by an amine N—HN hydrogen-bond pair, also giving a centrosymmetric cyclic association [graph set R22(8)], generating a linear chain parallel to [110].
metal-organic compounds
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The CuII atom in the title compound, [CuCl2(C16H15N3O)]·H2O, is N,N′,O-chelated by the neutral Schiff base ligand and exists in a square-pyramidal geometry. It is displaced by 0.316 (1) Å out of the square plane (r.m.s. deviation = 0.015 Å) in the direction of the apical Cl atom. The apical Cl atoms of adjacent complex units are hydrogen-bond acceptors to two water molecules, the interaction generating a centrosymmetric dimer through a cyclic R42(8) association.
metal-organic compounds
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The asymmetric unit of the title compound, [Cu(C9H10N3O3)Cl], contains two independent molecules with similar structures. The CuII cation is N,O,O′-chelated by the deprotonated Schiff base ligand and is further coordinated by a Cl− anion in a distorted ClNO2 square-planar geometry. In the crystal, adjacent molecules are linked by N—HO and N—HCl hydrogen bonds, forming a two-dimensional network parallel to [100].
metal-organic compounds
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In the title compound, [Cu2(C13H11N4S)2(N3)2], the CuII cation is N,N′,S-chelated by the deprotonated Schiff base ligand and is coordinated by the azide anion, while an N atom from an adjacent azide anion bridges the CuII cation at the apical position with a longer Cu—N distance of 2.533 (3) Å, completing the distorted N4S square-pyramidal coordination geometry. A pair of azide anions bridge the two CuII cations, forming a centrosymmetric binuclear molecule. In the crystal, the binuclear molecules are linked by an N—HN hydrogen bond into a ribbon running along the a axis.
organic compounds
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In the title compound {systematic name: (1R,2R,5R,7R,10R,11R,14S,15R)-14-[(2S)-2-hydroxy-6-methylhept-5-en-2-yl]-2,6,6,10,11-pentamethyltetracyclo[8.7.0.02,7.011,15]heptadecan-5-ol monohydrate}, C30H52O2·H2O, the three fused cyclohexane rings adopt chair conformations and the hydroxy substituent of one of these occupies an axial position. The fused cyclopentane ring adopts an envelope conformation (with the flap atom being the C atom bearing the methyl group) and the 3-methylbut-2-enyl portion of its substituent is disordered over three sets of sites in a 0.413 (7):0.250 (7):0.337 (7) ratio. The O atoms of both water molecules occupy special positions of 2 site symmetry. In the crystal, Os—HOw and Ow—HOs (s = steroid and w = water) hydrogen bonds link hydroxy groups and water molecules, forming a three-dimensional network. The crystal studied was found to be a non-merohedral twin with a 0.518 (1):0.482 (1) component ratio.
organic compounds
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In the crystal of the title salt, C26H34N22+·2I-, the dication lies on a center of inversion that exists along the mid-point of the butyl chain; its five-membered ring is approximately planar (r.m.s. deviation = 0.011 Å). In the crystal, the iodide anion is disordered over two positions in a 1:1 ratio.