Issue 23, 2012

Metallacycles of cadmium, mercury dicarboxylates

Abstract

A series of linear coordination polymers, metallacycles of cadmium(II) and mercury(II) of flexible carboxylic acid ligands, RCH{3-CH3–,5-CH3–,6-(–OCH2CO2H)C6H2}2, (when R = C6H5, (H2L1); 2-NO2C6H4– (H2L2) and 3-NO2C6H4– (H2L3)) are synthesized and characterized. [CdL1 (py)3]n·3nH2O (py = pyridine) is a linear coordination polymer, whereas [CdL2(py)(CH3OH)]2·CH3OH is a dinuclear complex of cadmium with a Cd2O2 type of core. The latter is obtained from reaction of cadmium(II) acetate with H2L2 in methanol followed by reaction with pyridine. A similar reaction of cadmium(II) acetate with H2L2 in dimethylformamide results in the formation of a cadmium metallacycle, namely [CdL2 (py)2(H2O)]2·H2O. The H2L3 reacted with cadmium(II) acetate in the presence of pyridine to form a metallacycle [CdL3(py)2(H2O)]2·3H2O. The ligand H2L2 form mercury(II) metallacycle [HgL2(4-mepy)2]2 in the presence of 4-methylpyridine (4-mepy) and the ligand H2L3 forms metallacycle [HgL3(3-mepy)2]2·DMF in the presence of 3-methylpyridine (3-mepy). The potassium salts of H2L1 and H2L2 were found to be coordination polymers and these potassium coordination polymers were structurally characterized.

Graphical abstract: Metallacycles of cadmium, mercury dicarboxylates

Supplementary files

Article information

Article type
Paper
Submitted
08 Mar 2012
Accepted
30 Mar 2012
First published
02 Apr 2012

Dalton Trans., 2012,41, 7115-7126

Metallacycles of cadmium, mercury dicarboxylates

B. Nath and J. B. Baruah, Dalton Trans., 2012, 41, 7115 DOI: 10.1039/C2DT30554B

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