M(H2O)(2)(4,4 '-bipy)[C6H4(COO)(2)]center dot 2H(2)O (M = Mn2+, Co2+) - Two isotypic coordination polymers with layered structure

摘要

Monoclinic single crystals of Mn(H2O)(2)(4,4'-bipy)[C6H4(COO)(2)](.)2H(2)O (1) and Co(H2O)(2)(4,4'-bipy)[C6H4(COO)(2)](.)2H(2)O (2) have been prepared in aqueous solution at 80 degrees C. Space group P2 (no. 13), Z 2; 1: a = 769.20(10), b = 1158.80(10), c = 1075.00(10) pm, beta 92.67(2)degrees, V = 0.9572(2) nm(3); 2: a = 761.18(9), b = 1135.69(9), c = 1080.89(9) pm, beta = 92.276(7)degrees, V = 0.9337(2) nm(3). M2+ (M = Mn, Co), which is situated on a twofold crystallographic axis, is coordinated in a moderately distorted octahedral fashion by two water molecules, two oxygen atoms of the phthalate anions and two nitrogen atoms of 4,4'-biypyridine (1: Mn-O 219.5(2), 220.1(2) pm, Mn-N 225.3(2), 227.2(2) pm; 2: Co-O 212.7(2), 213.7(2)pm, Co-N 213.5(3), 214.9(3)pm). M2+ and [C6H4(COO)(2))](2-) build up chains, which are linked by 4,4'-biyridine molecules to yield a two-dimensional coordination polymer with layers parallel to (001).Thermogravi metric analysis in air of I indicated a loss of water of crystallization between 154 and 212 degrees C and in 2 between 169 and 222 degrees C.