The structure of a second crystal polymorph of silver(I) 2,6-dihydroxybenzoate

The structure of a second crystal polymorph of silver(I) 2,6-dihydroxybenzoate, [Ag2((OH)2 · C6H3COO)2]n has been determined by X-ray diffraction and refined to a residual R = 0.036 for 1332 observed reflections. Crystals are monoclinic, space group P21/n with two dimeric units in a cell of dimensions a = 7.090(1), b= 11.693(2), c = 8.164(1)Å, β = 90.58(1)°. As in the first reported polymorph, the structure contains centrosymmetric bis(carboxylato-O,O′) bridged silver dimers. In the present structure, the dimers are cross-linked via Ag — O (hydroxyl) bonds [2.607(3)Å] to form a sheet polymer, whereas those in the earlier structure are discrete. Chelate-ring dimensions are essentially unchanged [Ag — O, 2.220, 2.236(3) cf. 2.203, 2.240(4)Å; Ag — Ag, 2.926(1) cf. 2.910(1)Å]

The crystal structure of tetrakis[trimethylthiomethyl-platinum(IV)], [Pt(CH3)3(SCH3)4

The crystal structure of trimethyl(thiomethyl)platmum(IV), [Pt(CH)(SCH)], has been determined using X-ray diffraction. The compound has three independent but isostructural tetrameric units in the asymmetric unit. The four metal atoms in each tetramer are linked by bridging thiomethyl sulphurs, with three methyl groups completing the octahedral coordination around each platinum. Mean interatomic distances within the tetramer are PtS, 2.48(2), PtC, 2.00(4), PtPt, 3.80(2) Å, with a mean bridge angle SPtS, 79.1(7)°

The preparation and crystal structure of the calcium complex with the herbicide endothall, Catena-[diaqua(7-oxabicyclo-[2.2.1]-Heptane-2,3- dicarboxylato)calcium(II)]

The calcium complex with the herbicide Endothall (7-oxabicyclo-[2.2.1]-heptane- 2,3-dicarboxylic acid) has been synthesized and its structure determined by X-ray methods. The seven-coordination about calcium is irregular comprising four oxygens from two carboxylate groups (two bridging), an ether oxygen [CaO, 2.387-2.508(3) Å] and two water molecules [CaO, 2.389, 2.398(4) Å]. The carboxylate groups on the Endothall moiety adopt an exo rather than an endo configuration

Crystal structure of bis(1-thia-4,7-diazacyclononane)copper(II) perchlorate

The cation, bis(1-thia-4,7-diazacyclononane)copper(II), in the perchlorate salt, has the metal atom on a crystallographic twofold axis, and is dissimilar to the nitrate, where the metal is at a centre of symmetry

The crystal structure of silver(I) 2,4,5-trichlorophenolate

The crystal structure of silver(I) 2,4,5-trichlorophenolate has been determined by X-ray diffraction and refined to a residual R = 0.031 for 1072 observed reflections. Crystals are orthorhombic, space group Pccn with 8 molecules in a cell of dimensions, a 11.455(4), b 23.75(1), c 5.645(1) Å. Each silver in the polymeric structure is bonded to three independent phenolate oxygens (Ag O range, 2.317-2543(3) Å; OAgO range, 86.5-106.5(2)°). In addition there is an unusual symmetrical and directed phenyl carbon-silver bond (AgC, 2.443(5) Å) that completes a trigonal pyramidal stereochemistry about silver

Metal-phenoxyalkanoic acid interactions. Part 20. The crystal structures of diaquabis(2-carbamoylphenoxyacetato)-copper(II) and tetraaquabis(2-carbamoylphenoxyacetato)nickel(II)

The crystal structures of two metal(II) complexes of 2-carbamoylphenoxyacetic acid (salicylamide-O- acetic acid, (SAH)) have been determined by X-ray methods. The first, diaquabis(2-carbamoylphenoxyacetato)copper(II) (1), forms triclinic crystals, space group P1 with 1 molecule in a unit cell of dimensions a = 4.0796(4), b = 9.936(1), c = 13.020(2) Å, α = 103.88(1), β = 107.00(1), γ = 97.61(1)°. The complex units are centrosymmetric monomers involving unidentate, trans-related acid ligands bonded through the phenoxy carboxylate oxygen [CuO, 1.933(2)] with two water ligands [CuOw, 1.961(3) Å] completing a square planar coordination about the central Cu(II) atom. Tetraaquabis(2-carbamoylphenoxyacetato)nickel(II) (2), is monoclinic, space group P2/c with 2 molecules in a unit cell of dimensions a = 10.957(2), b = 4.996(1), c = 20.042(4) Å, β = 105.51(2)°. These complex units are discrete centrosymmetric monomers involving unidentate, trans- related acid ligands bonded through the phenoxy carboxylate oxygen [NiO, 2.072(2) Å] with four water ligands [NiOw (mean), 2.069(2) Å] completing an almost regular octahedral coordination around the central Ni(II) atom. In both complexes, inter and intramolecular hydrogen bonding aids complex and crystal lattice stability

Metal-(phenylthio)acetic acid interactions-IV. The crystal structure of tetra-μ-[(2,4-dichloro-5-methylphenylthio)acetato-O,O′]-bis[acetonecopper(II)], a dimeric complex having coordinated acetone molecules

The crystal structure of the acetone adduct of copper(II) (2,4-dichloro-5-methylphenylthio)acetate has been determined by single crystal X-ray diffraction and refined by least squares to 0.051 for 3701 "observed" reflections. Crystals of the compound are triclinic, space group P1 with one dimer in a cell with a = 8.357(1), b = 12.502(2), c = 13.721(2) Å, α = 107.20(1), β = 96.09(1), γ = 104.94(1)°. The complex is a tetracarboxylate bridged dimer of the copper acetate hydrate type, with a CuCu separation of 2.646(1) Å and a mean CuO (equatorial) distance of 1.961(4) Å, while the axial positions of the dimer are occupied by coordinated acetone molecules [CuO, 2.206(3) Å]. X-ray crystal data and the results of chemical analyses are also presented, indicating that a second chemical polymorph has both acetone and water molecules, with a similar dimeric structure but having solvated acetone