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trans-Dichloridobis(triphenylphosphane-κP)palladium(II) benzene hemisolvate
(2012)
- The title complex, [PdCl2(C18H15P)2]·0.5C6H6, has the PdII ion in a square-planar coordination mode (r.m.s. deviation for Pd, P and Cl atoms = 0.024 Å) with the PPh3 and Cl ligands mutually trans. The benzene solvent molecule is located about a crystallographic inversion centre. The title complex is isostructural with trans-dichloridobis(triphenylphosphane)palladium(II) 1,4-dichlorobenzene sesquisolvate [Kitano et al. (1983 [triangle]). Acta Cryst. C39, 1015–1017].
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Space group revsion of the triclinic polymorph of salicyl-aldehyde azine
(2012)
- The structure of the title compound, C14H12N2O2 {systematic name: 2,2′-[hydrazinediylidenebis(methanylylidene)]diphenol}, has already been determined in the triclinic space group P An external file that holds a picture, illustration, etc. Object name is e-68-0o255-efi1.jpg with Z = 4 [El-Medani, Aboaly, Abdalla & Ramadan (2004 [triangle]). Spectrosc. Lett. 37, 619–632]. However, the correct space group should be P21/c with Z = 4. This structure is a new polymorph of the already known monoclinic polymorph of salicyladehyde azine, which crystallizes in space group P21/n with Z = 2. The benzene rings form a dihedral angle of 46.12 (9)°. Two intramolucular O—H[cdots, three dots, centered]N hydrogen bonds occur.
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Sodium pentafluorophenylborate
(2012)
- The crystal structure of the title compound, Na[(C6F5)BH3], is composed of discrete anions and cations. The sodium cations are surrounded by four anions with three short Na...B [2.848 (8), 2.842 (7) and 2.868 (8) Å] and two short Na...F contacts [2.348 (5) and 2.392 (5) Å], forming a three-dimensional network. The anion is the first structural example of a pentafluorophenyl ring carrying a BH3 group.
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Redetermination of (acetonitrile-κN)dicarbon-yl(η(5)-cyclo-penta-dien-yl)iron(II) tetra-fluoridoborate
(2012)
- The crystal structure of the title compound, [Fe(C5H5)(CH3CN)(CO)2]BF4, of which only the coordinates of the non-H atoms of the cation have previously been reported [Fadel et al. (1979 [triangle]). Z. Anorg. Allg. Chem. 453, 98–106] has been redetermined. The FeII atom in the complex cation is coordinated by a cyclopentadienyl ring, two carbonyl ligands and an acetonitrile molecule displaying a three-legged piano stool structure. Three of the four F atoms of the BF4 − anion are disordered over two sets of sites, with a site-occupancy factor of 0.709 (10) for the major occupied site.
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rac-4-Chloro-2-[({2-[(3-chloro-6-hydroxy-2,4-dimethylbenzyl)(methyl)amino]propyl}(methyl)amino)methyl]-3,5-dimethylphenol
(2012)
- The title compound, C23H32Cl2N2O2, a potential chiral ligand for coordination chemistry, was prepared by a two-step reaction. The molecule is located on a crystallographic centre of inversion. As a result, the methyl group bonded to the methylene group is disordered over two equally occupied positions, sharing the same site as the H atom of the chiral C atom. As a further consequence of the crystallographic centrosymmetry, the 1,2-diaminopropane unit adopts an antiperiplanar conformation and the two benzene rings are coplanar. The central chain is in an all-trans arrangement. An intramolecular O-H...N hydrogen bond makes an S(6) ring motif. A C-H...[pi] interaction links the molecules into one-dimensional chains along the [001] direction.
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Poly[[μ-ethane-1,2-diyl bis-(pyridine-3-carboxyl-ate)](μ-tetra-fluorido-borato)silver(I)]
(2012)
- In the title compound, [Ag(BF4)(C14H12N2O4)]n, the coordination of the Ag+ ion is trigonal–bipyramidal with the N atoms of two ethane-1,2-diyl bis(pyridine-3-carboxylate) ligands in the apical positions and three F atoms belonging to different tetrafluoridoborate anions in the equatorial plane. The material consists of infinite chains of [Ag(C14H12N2O4)] units running along [001], held together by BF4 − bridging anions.
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Methyl 2-oxo-2H-chromene-3-carboxylate
(2012)
- The title compound, C11H8O4, features an almost planar molecule (r.m.s. deviation = 0.033 Å for all non-H atoms). In the crystal, the molecules are linked via C-H...O hydrogen bonds, forming two-dimensional networks lying parallel to (1-21).
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Iodido(tri-tert-butylphosphane-κP)gold(I)
(2012)
- The AuI atom of the title compound, [AuI(C12H27P)], shows an almost linear coordination, with a P—Au—I angle of 178.52 (3)° [Au—P = 2.2723 (14) Å and Au—I = 2.5626 (6) Å].
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Intra- and intermolecular proton transfer in 2,6-diaminopyridinium 4-hydroxypyridin-1-ium-2,6-dicarboxylate
(2012)
- Chelidamic acid (4-hydroxypyridine-2,6-dicarboxylic acid) and 2,6-diaminopyridine react to form the title salt, C5H8N3+·C7H4NO5-; there are two formula units in the asymmetric unit. The pyridine N atom of 2,6-diaminopyridine is protonated whereas chelidamic acid is deprotonated at both carboxylate groups but protonated at the N atom; the reaction involves intra- and intermolecular proton transfer. In the crystal, each 2,6-diaminopyridinium cation participates in five strong N-H...O hydrogen bonds (including one bifurcated hydrogen bond). The crystal structure also features strong O-H...O hydrogen bonds between the chelidamate anions, leading to chains along the a axis.
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Dimethyl 6-bromo-2-methyl-1,2-dihydroquinoline-2,4-dicarboxylate
(2012)
- In the title compound, C14H14BrNO4, the dihydropyridine ring adopts a screw-boat conformation. In the crystal, pairs of N—H[cdots, three dots, centered]O hydrogen bonds link the molecules into inversion R 2 2(10) dimers.
