A monoaqua zinc complex. Unique acid dissociation behaviour

Drew, M.G.B., Parui, D., De, S., Chowdhury, S. and Datta, D. (2007) A monoaqua zinc complex. Unique acid dissociation behaviour. New Journal of Chemistry, 31 (10). pp. 1763-1768. ISSN 1144-0546 doi: 10.1039/b706230n

Abstract/Summary

Using the I : 2 condensate of benzil dihydrazone and 2-acetylpyridine as the ligand L, two complexes of zinc, [ZnL(CH3COO)]PF6 (1) and [ZnL(H2O)CIO4]CIO4 H2O (2), are synthesised from Zn(CH3COO)(2).2H(2)O and Zn(CIO4)(2).6H(2)O, respectively. From X-ray crystallography, both the complexes are found to be single helical with the metal in distorted octahedral N4O2 environment. In 1, the two oxygen atoms come from the bidentate acetate while 2 is a monoaqua complex with a perchlorate anion bound to the metal in monodentate fashion. The perchlorate in 2 is not at all weakly bound [Zn-O(perchlorate) 2.256(4) A]. Still in acetonitrile solution, the coordinated perchlorate ion dissociates upon deprotonation [reaction (i)].