Construction of Two- and Three-Dimensional Coordination Polymers from Cobalt Trimesate

Abstract

Two new cobalt 1,3,5-benzenetricarboxylate (trimesic acid, TMA) coordination polymers were synthesized and structurally characterized: [Co3(H2O)6(TMA3-)(TMA2-)(TMA1-)]·2H2O (1) and K[Co3(TMA3-)(TMA2-)2]·5H2O (2). 1 crystallizes in the hexagonal system, space group P6522 (no. 179), with a = 16.7265(2), c = 20.5822(4) Å, V = 4986.9(2) Å3, and Dc = 1.889 g cm-3. 2 is monoclinic, space group P2/c (no. 13), with a = 9.6096(1), b = 12.5610(1), c = 13.9736(2) Å, β = 109.239(1)°, V = 1592.50(3) Å3, and Dc = 1.938 g cm-3. 1 is two-dimensional and formed by a "dense" stacking of {Co3(H2O)6(TMA3-)(TMA2-)(TMA1-)} layers. In compound 2 the connection of sinusoidal chains of cobalt octahedra by two types of trimesate ions gives a three-dimensional network with pentahydrated channels.