Steric Influences in Octahedral Cohaloximes. The Crystal and Molecular Structure of trans-methylhis(dimethylglyoximato) (phosphite)cobalt(III) Complexs with Phosphite=P(OMe)2Ph and P(OMe)Ph2

The crystal structures of the title compounds, (P(OMe)2Ph)Co( DH)2Me (I) and (P(0Me)Ph2)Co(DH)2Me (II), are reported. Compound I crystallizes in the orthorhombic system, space group Pbca, with cell parameters a = 14.652(7), b = 26.45(1) and c = 11.330(6) A and z = 8; compound II crystallizes in the monoclinic system, space group P21 with cell parameters a = 9.423(7), b = 15.184(8), c = 8.948 (7) A and ~ = 100.50(9)0 , Z = 2. Both structures were solved by conventional Patterson and Fourier methods and refined by the block diagonal least-squares method to final R values of 0.033(1) and 0.034(II), using 2108 for I and 2063 for II independent reflections with I > 30\u27(1). In both compounds the cobalt atom has a distorted octahedral geometry, the two DH units occupying the equatorial positions and Me and the P-ligand the axial ones. The Co-C and Co- P bond lengths are 2.013(5) and 2.287(1) A in I and 2.019(6) and 2.352(1) A in II, respectively. Linear correlation between Co-P bond lengths and Tolman\u27s cone angles in the series RaPCo(DH)2Me is found, with the exception of the P(OMe)Ph2 derivative. Furthermore, the linear relationship between the above Co-P distances and those reported for analogous chloro-derivatives, already found for phosphines, is valid for I but not for II

4-[(4′-Chloro­methyl-[1,1′-biphen­yl]-4-yl)meth­yl]bis­(dimethyl­glyoximato-κ2 N,N′)(pyridine-κN)cobalt(III)1

The title compound, [Co(C14H14Cl)(C4H6N2O2)2(C5H5N)], is a model compound for the more complex cobalamines like vitamins B12. The CoIII atom is coordinated by a (4′-chloro­methyl-[1,1′-biphen­yl]-4-yl)methyl group, an N-bonded pyridine and two N,N′-bidentate dimethyl­glyoximate ligands in a distorted octa­hedral geometry. The glyoximate ligands exhibit intra­molecular O—H⋯O hydrogen bonds, which is very common in cobaloxime derivatives

catena-Poly[[aqua­copper(II)]-μ2-imino­diacetato-κ4 O,N,O′:O′]

In the title compound, [Cu(C4H5O4)(H2O)]n, the imino­diacetate (ida) ligands link the CuII atoms into polymeric zigzag chains running along [010]. Each CuII ion is five-coordinated in a distorted square-pyramidal geometry by one N and two O atoms from an ida ligand, one O atom from the neighbouring ida ligand and one water O atom. In the crystal, the polymeric chains are held together via inter­molecular O—H⋯O and N—H⋯O hydrogen bonds

(N 4-n-Butyl­pyridine-4-carbothio­amide-κN 4)chloridobis(dimethyl­glyoximato-κ2 N,N′)cobalt(III) hemihydrate

The title compound, trans-[Co(C4H7N2O2)2Cl(C10H14N2S)]·0.5H2O, contains two independent mol­ecules in the asymmetric unit in which the CoIII ions are coordinated in slightly distorted octa­hedral coordination environments. The bis-chelating glyoximate ligands, which occupy equatorial sites, are linked by interligand O—H⋯O hydrogen bonds. The dihedral angles between the mean planes of the glyoximate ligands in each mol­ecule are 2.07 (8) and 1.60 (1)°. The asymmetric unit contains a solvent water mol­ecule which is disordered over two sites with refined occupancies 0.64 (2) and 0.36 (2)

1,1,1-Trifluoro-4-(thio­phen-2-yl)-4-[(2-{[4,4,4-trifluoro-3-oxo-1-(thio­phen-2-yl)but-1-en-1-yl]amino}­eth­yl)amino]­but-3-en-2-one

The asymmetric unit of the diamine compound, C18H14F3N2O2S2, consists of two mol­ecules; the C=C double bond has a Z configuration in the C4H3S—C=C—C(=O)—C segment. The –NH—CH2—CH2—NH chain adopts a twisted U-shape. The amino group is an intra­molecular hydrogen-bond donor to the carbonyl group; the intra­molecular hydrogen bond generates a six-membered ring. In both mol­ecules, the thienyl rings are disordered over two positions; the occupancies of the major components are 0.817 (4) and 0.778 (4) in one mol­ecule and 0.960 (4) and 0.665 (4) in the other. One of the trifluoro­methyl groups is disordered over two positions with the major component having 0.637 (8) occupancy