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

Two new cobalt 1,3,5-benzenetricarboxylate (trimesic acid, TMA) coordination polymers were synthesized and structurally characterized: [Co 3 (H 2 O) 6 (TMA 3 - )(TMA 2 - )(TMA 1 - )]·2H 2 O ( 1 ) and K[Co 3 (TMA 3- )(TMA 2- ) 2 ]·5H 2 O ( 2 ). 1 crystallizes in the hexagonal system, space group P 6 5 22 (no. 179), with a = 16.7265(2), c = 20.5822(4) Å, V = 4986.9(2) Å 3, and D c = 1.889 g cm - 3 . 2 is monoclinic, space group P 2/ 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) Å 3, and D c = 1.938 g cm - 3 . 1 is two-dimensional and formed by a “dense” stacking of {Co 3 (H 2 O) 6 (TMA 3 - )(TMA 2 - )(TMA 1 - )} 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.