Synthesis and Structural Characterization of Mono- and Di-nuclear Zinc(Ⅱ) Coordination Compounds of Triphenylphosphoniopropionate

Abstract

Abstract: Two novel coordination compounds of Zn(Ⅱ) with PH₃P⁺(CH₂)₂CO₂^-(L), namely, [ZnL₄(H₂O)₂]·(ClO₄)₂·2H₂O(compound 1) and [Zn₂Cl₄(μ-L-O,O′)₂](compound 2), have been prepared. The single crystal X-ray structure analysis of these compounds indicates that in compound 1 the Zn(Ⅱ) atom is coordinated by four monodentate carboxylato groups on the equatorial plane and two aqua ligands occupy the axial coordination positions. The pendant oxygen atoms form strong hydrogen bonds with the aqua molecules which results in the stability of this structure. In compound 2, two Zn(Ⅱ) atoms are bridged by a pair of carboxylato groups, showing a skew-bridge mode, and thus enabling a long Zn(Ⅱ)…Zn(Ⅱ) separation. As we know, it is a dinuclear coordination compound with the longest Zn…Zn separation.

Key words: Triphenylphosphoniopropionate, Quaternary phosphonium betaine, Mono- and Di-nuclear Zn(Ⅱ) coordination compounds, Crystal structure

LI Song-lin, HOU Jian-feng, JIANG Ning-yi, Mak Thomas C. W.. Synthesis and Structural Characterization of Mono- and Di-nuclear Zinc(Ⅱ) Coordination Compounds of Triphenylphosphoniopropionate[J]. Chemical Research in Chinese Universities, 2005, 21(4): 391-395.

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