Metal-phenoxyalkanoic acid interactions. Part 15. The crystal structures of diaquabis(phenoxyacetato)cadmium(II) and catena-μ-[aquabis(phenoxyacetato-O)lead(II)-bis(phenoxyacetato)lead(II)] |
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Authors: | Thomas C W Mak Wai-Hing Yip |
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Institution: | Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong Department of Chemistry, Queensland Institute of Technology, Brisbane, Qld. 4000, Australia Department of Chemistry, University of Queensland, Brisbane, Qld. 4067, Australia |
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Abstract: | The crystal structures of the cadmium(II) and lead(II) complexes of phenoxyacetic acid (PAH) have been determined by single crystal X-ray diffraction techniques. The cadmium complex, Cd(PA)2(H2O)2] (1), space group C2, with Z = 2 in a cell of dimensions, a = 11.801(2), b = 5.484(1), c = 13.431(3) Å, β = 100.87(2)°, possesses a distorted trapezoidal bipyramidal coordination around the metal atom, involving two water oxygens 2.210(5) Å] and four carboxyl oxygens from two symmetrical bidentate phenoxyacetate ligands 2.363(4), 2.365(4) Å] with Cd lying on the crystallographic two- fold axis. The lead complex, Pb2(PA)4(H2O)]n(2) is triclinic, space group P, Z = 2, with a cell of dimensions, a = 10.135(4), b = 10.675(3), c = 19.285(9) Å, α = 114.66(3), β = 91.94(3) and γ = 114.99(3)°. (2) is a two-dimensional polymer with a repeating dimer sub-unit. The first lead Pb(1)] has an irregular MO8 coordination 2.34?2.96(2) Å: mean, 2.63(2) Å] involving the water molecule, two oxygens from an asymmetric bidentate carboxylate group, two from a bidentate chelate O(ether), O(carboxylate)] group and three from bridging oxygens, one of which also provides a polymer link to another symmetry generated lead. The second lead Pb(2)] is irregular seven-coordinate PbO, 2.48?2.73(2) Å: mean, 2.61(2) Å] with three bonds from the bridging groups, two from an unsymmetrical bidentate carboxylate (O, O′) group and one from a second carboxyl group which also bridges two Pb(2) centres in the polymer. |
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Keywords: | Author to whom correspondence should be addressed |
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