engleski

Tunable coordination geometry of Cd(II) in picolinamide complexes

As a d-block metal with 4d10 electronic configuration, cadmium(II) does not have ligand field stabilization energy (LFSE). The coordination number of cadmium(II) in its complexes is determined as a balance between bonding energies and repulsions among the ligands determines. The combining effects of softness and lack of LFSE allow CdII to adopt various coordination numbers and variety of geometries and structural motifs from discrete mononuclear complexes to complex three-dimensional networks. It is now well established that coordination polymers of CdII may readily be obtained by using some inorganic bridging anions (halides or pseudohaliedes) in combination with organic ligands of interest. Less attention was paid to understand how coordination numbers and geometries of CdII ion could be tuned by slight variation of similar ions and/or reaction conditions. For this purpose, investigated were reactions of CdII with pyridine-2-carboxamide and various oxoanions as well as halide ions. The reactions were carried out in aqueous solutions at ambient conditions. The structural characterization was achieved by the single crystal X-ray diffraction method.

cadmium(II); coordination polyhedra; crystal structure

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