oa South African Journal of Chemistry - The crystal structures of two novel cadmium-picolinic acid complexes in relation to the solution species : short communication
|Article Title||The crystal structures of two novel cadmium-picolinic acid complexes in relation to the solution species : short communication|
|© Publisher:||South African Chemical Institute (SACI)|
|Journal||South African Journal of Chemistry|
|Affiliations||1 University of the Witwatersrand, 2 University of the Witwatersrand and 3 University of the Witwatersrand|
|Publication Date||Jan 2011|
|Pages||38 - 41|
|Keyword(s)||Cadmium, Controlled pH, Crystal structures, Picolinic acid and Solution species|
The crystal structures of two novel cadmium-picolinic acid complexes grown in aqueous solutions at selected pH values are reported. The structures are compared to expected solution species under the same conditions. The crystal structure of complex 1 exhibits a seven coordinate structure which contains a protonated picolinic acid ligand that bonds bidentately to the cadmium ion via both carboxylate oxygens. Two nitrates coordinate to the metal centre within the same plane, one monodentately and the other bidentately, and two water molecules are found in the axial positions. The structure of complex 2 shows cadmium bonded to three of N,O-bidentate picolinic acid ligands to produce a distorted octahedron.
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