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Title: Mononuclear Zinc(II) and Mercury(II) Complexes of Schiff Bases Derived from Pyrrolealdehyde and Cysteamine Containing Intramolecular NH---S Hydrogen Bonds
Authors: Wu, Kuan-Yi;Hsieh, Chang-Chih;Horng, Yih-Chern
Contributors: 化學系
Keywords: NH-S hydrogen bond;Cysteamine;Schiff base;Pyrrole
Date: 2009-06
Issue Date: 2013-01-07T02:15:57Z
Publisher: Elsevier
Abstract: Two neutral group 12 metal complexes, bis(pyrrol-2-ylmethyleneaminoethylthio)zinc(II) (1) and bis(pyrrol-2-ylmethyleneaminoethylthio)mercury(II) (2), with the (Nimine)2S2 coordination mode were synthesized by using metal-templated Schiff base condensation, and their molecular structures were determined by X-ray diffraction analysis. Complex 1 exhibits a distorted tetrahedral geometry around the metal, whereas the metal center has a bisphenoidal configuration in complex 2. Both mononuclear complexes possess intramolecular NH⋯S hydrogen bonds, as evidenced by IR, 1H NMR and X-ray crystallography. The hydrogen-bond donor (H–Npyrrole) and acceptor (S atom) are coming from different ligands within a single molecule. Complex 2 represents the first example of a mercury complex in the N2S2 coordination mode with intramolecular NH⋯S hydrogen-bond interactions. An investigation of the effects of the NH⋯S hydrogen bonding on the stability of 1 and 2, using an N-methyl pyrrolyl analogue, demonstrated that the N–H hydrogen-bond donor from the pyrrolyl moiety probably played a role in the stability of 1, but not 2.
Relation: J. Organomet. Chem., 694(13): 2085-2091
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