S. Ghosh, S. Neogi, E. Sañudo
2008
Citations
0
Influential Citations
13
Citations
Journal
Inorganica Chimica Acta
Abstract
The reaction between pyridine-4-hydroxy-2,6-dicarboxylic acid (cdaH 2 ) and Cu(NO 3 ) 2 · 3H 2 O afford products that depend on the reaction conditions applied. In presence of excess of aqueous pyridine (1:2 v/v), equimolar amounts of the reactants form {[Cu( cda )(py) 3 ] 2 · 5H 2 O} n ( 1 ). In this complex, dimeric water clusters are H-bonded to carboxylate O atoms forming both left- and right-handed helices. These helices are further H-bonded to form a tubular coordination polymer. It crystallizes in the monoclinic space group P 2 1 / a with a = 14.235(5), b = 23.097(4), c = 15.542(6) A, β = 114.392(5)°, V = 4654(2) A 3 , Z = 4, R 1 = 0.0422, wR 2 = 0.0992, S = 0.899. When pyridine is used in place of aqueous pyridine, a new coordination polymer, {Cu( cda )(py)} n ( 2 ) is formed that crystallizes in the monoclinic space group P 2 1 / c with a = 12.391(5), b = 12.770(5), c = 7.135(5) A, β = 95.155(5)°, V = 1124(1) A 3 , Z = 4, R 1 = 0.0415, wR 2 = 0.0882, S = 1.190. The structure of 2 consists of carboxylate-bridged [Cu( cda )(py)] units extending as a zigzag infinite chain where each metal ion shows square-pyramidal geometry. Variable temperature magnetic susceptibility measurements in the temperature range, 2–300 K for 2 is also reported.