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Synthesis and Structures of Zinc(II) and Cadmium(II) Complexes with ( η 6 ‐Benzenecarboxylate) Chromium Tricarbonyl and Pyrazole Derivatives
Author(s) -
Murugesapandian Balasubramanian,
Roesky Peter W.
Publication year - 2011
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201100269
Subject(s) - pyrazole , chromium , denticity , zinc , bimetallic strip , chemistry , cadmium , medicinal chemistry , carboxylate , cadmium acetate , stereochemistry , crystallography , crystal structure , organic chemistry , catalysis
Abstract. Reaction of zinc acetate with four different substituted pyrazoles (3,5‐dimethyl pyrazole (3,5‐Me 2 PzH), 3,5‐di‐ tert ‐butyl pyrazole (3,5‐ t Bu 2 PzH), 3,5‐diphenyl pyrazole (3,5‐Ph 2 PzH), and 5‐methyl‐3‐phenyl pyrazole (3‐Ph‐5‐Me‐PzH)) followed by treatment with( η 6 ‐benzenecarboxylic acid) chromium tricarbonyl afforded the bimetallic zinc‐chromium complexes [Zn{( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } 2 (3,5‐Me 2 PzH) 2 ], [Zn{( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } 2 (3,5‐ t Bu 2 PzH) 2 ], [Zn{( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } 2 (3,5‐Ph 2 PzH) 2 ], and [Zn{ η 6 ‐C 6 H 5 COO)Cr(CO) 3 } 2 (3‐Ph‐5‐Me‐PzH) 2 ]. The corresponding bimetallic cadmium‐chromium complexes [Cd{( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } 2 (3,5‐Me 2 PzH) 2 ] and [Cd{( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } 2 (3,5‐ t Bu 2 PzH) 2 ] were obtained by using cadmium acetate as starting material. The pyrazole rings and the carboxylate {( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } – anion act as monodentate ligand in the zinc complexes, whereas a monodentate and bidentate coordination of the {( η 6 ‐C 6 H 5 COO)Cr(CO) 3 } – anion is observed in the cadmium complexes.