The Crystal and Molecular Structure of catena-{Aquabis[2-methyl-2-(phenylthio)-propanoato]cadmium(II) monohydrate}

The crystal structure of the cadmium complex of 2-methyl-2-(phenylthio) propanoic acid, [ Cd (C6H5SC(CH3)2CO2)2(H2O)]. H2O has been determined by X-ray diffration and refined to a residual R 0.051 for 2725 observed reflections. Crystals are orthorhombic, space group Pbca with a 10.819(2), b 9.030(1), c 47.24(2) A and Z 8. The stereochemistry about cadmium is distorted MO6S seven-coordinate with Cd -S 2.747(2)Ǻ and a Cd -O range 2.277-2.491(5)Ǻ. Bonds are from cadmium to a water, and to four oxygens from two bidentate carboxylate groups, one of which also forms a polymer link. The same carboxylate group is also involved in a five- membered (S,O) chelate ring.

Univalent Metal Complexes of (Perfluorophenoxy)acetic Acid. The Crystal Structures of (2,3,4,5,6-Pentafluorophenoxy)acetic Acid, Bis-μ-[(2,3,4,5,6-pentafluorophenoxy)acetato-O,O']-bissilver(I) and catena-Bis-μ-[(2,3,4,5,6-Pentafluorophenoxy)acetato-O]-bismercury(I)

The crystal structures of perfluorophenoxyacetic acid [(2,3,4,5,6- pentafluorophenoxy )acetic acid] and its anhydrous complexes with silver(I) and mercury(I) have been determined by X-ray diffraction and refined to residuals R = 0.046, 0.042 and 0.104 for 1235, 1789 and 2750 observed reflections respectively. The acid forms the usual hydrogen- bonded cyclic dimers [O---O, 2.705(3)Ǻ] with the oxyacetic acid side- chain synclinally oriented. Crystals age triclinic, space group Pī with Z 2 in a cell of dimensions a 7.479(1), b 7.592(2), c 8.463(2)Ǻ,α 80.15(2),β 85.34(2),γ 61.31(1)Ǻ. The silver complex, [Ag2L2],(1), has crystals with a 5.992(3), b 30.22(2), c 5.277(2)Ǻ, β 106.42(5)°, space group P21/a and Z 2. The bis-carboxylato (O,O′) dimers have Ag-Ag 2.943(1)Ǻ with Ag-O, 2.203, 2.230(3)Ǻ and O-Ag-O 161.6(2)°. The complex with mercury(I), [Hg2L2]n, (2), is centrosymmetric with the usual linear O-Hg-Hg-O-bonds [Hg-Hg, 2.514(1)Ǻ; Hg-O, 2.13(1)Ǻ; O-Hg-Hg, 173.9(2)°]. Longer peripheral bonds to Hg [Hg-O, 2.63(1)Ǻ] produce a polymeric structure. Crystals of (2) are triclinic, space group Pī with Z 1 in a cell of dimensions a 5.038(1), b 5.970(1), c 15.774(6)Ǻ, α 80.77(2),β 86.42(2),γ 84.38(2)°.

Metal Phenoxyalkanoic Acid Interactions. XXV. The Crystal Structures of (2-Formyl-6-Methoxyphenoxy)Acetic Acid and Its Zinc(II) Complex and the Lithium, Zinc(II) and Cadmium(II) Complexes of (2-Chlorophenoxy)Acetic Acid

The crystal structures of (2-formyl-6-methoxyphenoxy)acetic acid (1), diaquabis [(2-formyl-6-methoxyphenoxy) acetato ]zinc(11) (2), tetraaquabis [(2-chlorophenoxy) acetato ]zinc(11) (3), triaquabis [(2-chlorophenoxy) acetato ]cadmium(11) dihydrate (4) and lithium (2-chloro- phenoxy )acetate 1.5 hydrate (5) have been determined by X-ray diffraction. The acid (1) forms centrosymmetric hydrogen-bonded cyclic dimers [O…0, 2.677(6) �] which are non-planar. Complex (2) is six-coordinate with two waters [Zn- Ow , 1.997(2) �] and four oxygens from two asymmetric bidentate carboxyl groups [Zn-O, 2.073, 2.381(2) �] completing a skew trapezoidal bipyramidal stereochemistry. Complex (5) is also six-coordinate but is octahedral, with two trans-related unidentate carboxyl oxygens [mean Zn-O, 2.134(9) �] and four waters [mean Zn-O, 2.081(9) �]. The seven-coordinate complex (4) has crystallographic twofold rotational symmetry relating two :symmetric bidentate acid ligands [ Cd -O, 2.26, 2 48(:) �] and two waters [ Cd -O, 2.34(2) �] while the third water lies on this axis [ Cd -O, 2.27(2) �]. In contrast to the monomers (2)-(4), complex (5) is polymeric with tetrahedral lithium coordinated to one water and three carboxylate oxygens [mean Li-0, 1.95(1) �]. The essential conformation of the free acid is retained in complexes (2), (3) and (4) but in (5), it is considerably changed.

Metal (Phenylthio)Alkanoic Acid Interactions. VII. The Crystal Structures of catena-[(Phenylthio)ethanoatosilver(I)] and Tetrakis-μ-[2-(2-chlorophenylthio)-2-Methyl-Propanoato-O,O']-bis[aquacopper(II)]

Metal complexes of two (phenylthio) alkanoic acids have been prepared and their structures determined by X-ray diffraction. catena-[( Phenylthio ) ethanoatosilver (1)] (1) forms crystals which are orthorhombic, space group Pccn, Z 8 and a 26.772(8), b 10.479(3) c 6.007(1) �. The polymer structure consists of a distorted trigonal pyramidal AgO3S repeating unit with coordination in the trigonal plane by a bidentate chelate thioethanoate group [Ag-O, 2.508(3); Ag-S, 2.513(2) �]. The third position in the plane and the axial position are occupied by bridging carboxylate oxygens [Ag-0, 2.454(3), 2.230(4) �], giving the two-dimensional structure. Complex (2) is a tetracarboxylate bridged dimer of the copper(11) ethanoate hydrate type, with a Cu-Cu separation of 2.624(2) � and Cu-OH2 (axial) distances of 2.155(7) and 2.182(6) �. Crystals are triclinic, space group PI with two dimers in a cell of dimensions a 7.340(2), b 14.863(5), c 22.963(8) �; α 104.33(2), β98.18(2), γ 102.18(2)�. Final residuals for (1) and (2) were 0.045 and 0.051 for 1688 and 3467 observed reflections respectively.

The Crystal Structure of catena-{μ-[2-Methyl-2-(phenylthio)propanoato-O,O′]-{tris-μ-[2-methyl-2 -(phenylthio)propanoato-O,O′]-dizinc(II)}}

.The crystal structure of the anhydrous zinc(11) complex of 2-methyl-2-(phenylthio) propanoic acid, with formula [Zn2(C10H12O2)4]n, has been determined by X-ray diffraction at 20�C and refined to a residual R 0.041 for 2885 observed reflections. Crystals are monoclinic, space group P 21, with two diper units of the polymer in a unit cell with dimensions a 12.710(4), b 13.760(2), c 12.699(6) �, β 95.44(5)�. The polymer structure is based on a repeating tris -carboxylate-bridged dimer unit with each zinc centre tetrahedral [Zn-O (mean) 1.958(5) �, Zn-Zn 3.393(2) �]. The dimer is extended into a linear polymer chain by an O,O' bridge through the carboxy group of the fourth carboxylate ligand.

The Crystal-Structure of Silver(I) (2-Carbamoylphenoxy)Acetate

The crystal structure of anhydrous silver(I)(2-carbamoylphenoxy)acetate has been determined by X-ray diffraction and refined to a residual of 0.041 for 1532 observed reflections. The complex forms crystal: with space group C2/c and Z4 in a unit cell of dimensions a 20.789(6), b 5.202(1) c 17.318(6)Ǻ, β 105.89(2)°. The structure is based on a centrosymmetric bis-carboxylate bridged dimer [Ag-O 2.228(3), 2.266(3)Ǻ, O-Ag-O 155.8(1)°; Ag…Ag 3.001(1)Ǻ] which is extended into an infinite zigzag polymer through the axial positions via the carbamoyl oxygens of adjacent ligands [Ag-O 2.494(3)Ǻ]. Symmetrical long-rang interactions of phenyl-carbon to silver are also found in the structure [Ag-C 3.094, 3.078(4)Ǻ].