A G Orpen

Chlorobis(triphenylphosphine)nickel(I)

Crystals of the title compound, [NiCl(C(18)H(15)P)(2)], contain one molecule per asymmetric unit with no short intermolecular interactions. This is noteworthy since previous studies have reported that the formally 15-electron species oligomerizes in the solid state. The nickel(I) centre has a distorted trigonal-planar coordination geometry, the origin of which is suggested to be electronic in nature.

Three PtII catecholate and 1,2-dithiocatecholate complexes

In the crystal structures of the three title complexes, (benzene-1,2-diolato-O,O)bis(triphenylphosphine)platinum(II), [Pt(C 6 H 4 O 2 )(C 18 H 15 P) 2 ], (1), (benzene-1,2-dithiolato-S,S) bis (triphenylphosphine)platinum(II), [Pt(C 6 H 4 S 2 )(C 18 H 15 P) 2 ] (2), and the n-hexane hemisolvate of (benzene-1,2-diolato-O,O)-bis(tricyclohexylphosphine)platinum(II), [Pt(C 6 H 4 O 2 )(C 18 H 33 P) 2 ].0.5C 6 H 14 , (3), the Pt atoms are tetracoordinate with distorted square-planar geometry. Compounds (1) and (2) are isostructural.

Three sulfur-containing diborane(4) compounds

The preparation and structures of three diborane(4) compounds are described. The compound B2(3,4-S2C4H2-1-S)2 [2,2′-bi(1,3,5,2-trixadthiaxadborapentalene), C8H4B2S6] is planar and lies at a crystallographic inversion centre. The amine adducts [B2(C3S5)2(NHMe2)2] [2,2′-bisxad(dixadmethylxadamino)-2,2′-bi(1,3,4,6,2-tetraxadthiaxadborapentalene-5-thione), C10H14B2N2S10] and [B2(1,2-S2C2H4)2(NHMe2)2]·0.33CH2Cl2 [1,2-bisxad(di-methylamino)-1,1:2,2-bis(dimethylenedithioxy)diborane(4) dixadchloroxadmethane solvate, C8H22B2N2S4·0.33CH2Cl2] contain dixadmethylxadamine ligands bound to each boron in an anti conformation about the B—B bond, with tetrahedral geometry at the B atoms. The crystal structures display a number of S⋯S interactions, which appear to dictate the packing arrangements.

Di­methyl­ammonium tetra­hydro­pentaborate

The title compound [systematic name: dixadmethylxadammonium 1,1′-spiro-bis(3,5,-dixadhydroxy-2,4,6-trioxa-1,3,5-triboraxadcycloxadhexane)xadborate], C2H8N+·B5H4O10−, contains the [B5O6(OH)4]− tetraxadhydroxadpentaborate anion, which possesses typical geometrical parameters, accompanied by dixadmethylxadammonium cations. The packing of these species is influenced by cation-to-anion N—H⋯O and anion-to-anion O—H⋯O hydrogen bonds.

Compositional disorder in trans-[RhBr0.26Cl0.74H(PMe3)4]-[B(1,2-O2C6Br4)].CH2Cl2

The structure of trans-(bromo/xadchloro)xadhyxaddridoxadtetraxadkisxad(tri-mexadthylxadphosxadphine)xadrhodxadium(III) bisxad(tetraxadbromoxadpyroxadcatechol-ato-O,O′)xadborate dichloromethane solvate, [RhCl0·74Br0·26H-(C3xadH9xadP)4]xad(C12xadBBr8xadO4)·xadCH2Cl2, is reported. The RhIII comxadplex shows bromine/chlorine compositional disorder with a trans arrangement of the hydride and halide ligands. The anion has approximate D2d symmetry, with a central spiro-B atom distorted from regular tetrahedral geometry by the small chelating O—B—O angles.

2-Oxo-1,2-dihydro­pyrimidin-3-ium di-μ-chlorido-bis­{dichloridobis[pyrimidin-2(1H)-one-κN3]cuprate(II)} dihydrate

The asymmetric unit of the title compound, (C4H5N2O)2[Cu2Cl6(C4H4N2O)2]·2H2O, consists of one cation, one half of a centrosymmetric dianion and one water molecule. The centrosymmetric dianion formed by dimerization in the crystal structure has neutral pyrimidin-2-one ligands coordinated to each copper(II) centre through Cu—N bonds. The Cu atoms each have a distorted trigonal bipyramidal geometry, with the N atom of the pyrimidin-2-one ligand in an axial position, and dimerize by sharing two equatorial Cl atoms. N—H⋯Cl, O—H⋯Cl and N—H⋯O hydrogen bonds connect the anions, cations and water molecules, forming a three-dimensional network.

2,6-Dibromo-4-nitroaniline

In the crystal structure of 2,6-dibromo-4-nitroaniline, C 6 H 4 Br 2 N 2 O 2 , weak hydrogen bonds exist between the pair of amino protons on one molecule and the pair of p-nitro O atoms on an adjacent molecule, with further interactions, perpendicular to these weak hydrogen bonds, between O and Br atoms on neighbouring molecules, forming π-stacked two-dimensional layers in the crystallographic a direction.

Mononuclear Indium and Gallium Tetrachlorocatecholate Complexes

Two mononuclear tetrachlorocatecholate complexes, chlorotri(pyridine-N) [3,4,5,6-tetrachloro-1,2-benzene-diolato(2-)-O,O]indium, [InCl(1,2-O 2 C 6 Cl 4 )(py) 3 ], (1), and chloro(1,10-phenanthroline-N,N)(pyridine-N)[3,4,5,6-tetrachloro-1,2-benzenediolato(2-)-O,O]gallium, [GaCl(1,2-O 2 C 6 Cl 4 )(py)(phen)], (2) (py is pyridine, C 5 H 5 N, and phen is 1,10-phenanthroline, C 12 H 8 N 2 ), have been structurally characterized as solvates, (1) as its bis(diethyl ether) solvate and (2) as its 3.5-pyridine solvate. Both (1) and (2) contain octahedrally coordinated metals but with the nitrogen donor ligands in a mer arrangement in (1) and a fac arrangement in (2). Stabilization by intramolecular CH...O and CH... Cl interactions is evident, and, together with steric considerations, is likely to promote the observed configurations. Compound (1) shows an interesting packing arrangement of infinite planar sheets held together by short Cl...Cl contacts.

Tetrahydrofuran adducts of a chlorobismuthate(III) anion and antimony triiodide

Tetrahydrofuran (thf) adducts of a chlorobismuthate(III) anion and of antimony triiodide have been prepared and characterized by X-ray crystallography. The former compound, bis[tetrakis(tetrahydrofuran-O)lithium(I)] di-μ-chloro-bis[trichloro(tetrahydrofuran-O)bismuthate(III)], [Li(C4H8O)4]2[Bi2Cl8(C4H8O)], contains centrosymmetric edge-shared bi-octahedral dianions with the formula [Bi2Cl6(thf)2(μ-Cl)2]2− in which the thf ligands occupy terminal sites at 90° to the Bi2(μ-Cl)2 plane; the cations are [Li(thf)4]+. The latter structure, triiodo(tetrahydrofuran-O)antimony(III), [SbI3(C4H8O)], comprises a polymeric arrangement of SbI3(thf) units, the antimony centres bridged alternately by pairs of I atoms and pairs of thf ligands.

4‐Methyl­pyridinium bis­(pyrocatecholato‐κ2O,O′)­borate catechol solvate

Unlike the previously reported salts of the 4-methylxadpyridinium cation and the bisxad(pyrocatecholato)xadborate anion [Clegg et al. (1998). Acta Cryst. C54, 1875–1880], the title compound, C6H8N+·C12H8BO4−·C6H6O2, is a solvate containing a molxadecule of catechol. The crystal packing is influenced by N—H⋯O and O—H⋯O hydrogen bonds.