An unprecedented mononuclear double helicate with a square planar metal ion

Drew, M.G.B., De, S. and Datta, D. (2008) An unprecedented mononuclear double helicate with a square planar metal ion. Inorganica Chimica Acta, 361 (9-10). pp. 2967-2972. ISSN 0020-1693 doi: 10.1016/j.ica.2007.10.045

Abstract/Summary

Reactions of the 1:2 condensate (L) of benzil dihydrazone and 1-methyl-2-imidazole carboxaldehyde with Cd(ClO4)(2)center dot xH(2)O and CdI2 yield [CdL2]( ClO4)(2) (1) and LCdI2 (2), respectively. The yellow ligand L, and its yellow complexes 1 and 2 are characterized by NMR and single crystal X-ray diffraction. Though L contains four N-donor centers, 1 is found to be a four-coordinate double helicate with a square planar Cd(II)N-4 core and 2 a spiral coordination polymer with tetrahedral Cd(II)N2I2 moieties. The bidentate nature of L and the occurrence of the square planar coordination of Cd( II) is explained by DFT calculations. (c) 2007 Elsevier B. V. All rights reserved.