M(H2O)2(4,4'-bipy)[C6H4(COO)2]·2H2O (M=Mn2+,Co2+) Two Isotypic Layer-like Coordination Polymers

What is it about?

Monoclinic single crystals of Mn(H2O)2(4,4'-bipy)[C6H4(COO)2]·2H2O (1) and Co(H2O)2(4,4'-bipy)[C6H4(COO)2]·2H2O (2) have been prepared in aqueous solution at 80 °C. Space group P2/n (no. 13), Z = 2; 1: a = 769.20(10), b= 1158.80(10), c= 1075.00(10) pm, beta= 92.67(2)°, V = 0.9572(2) nm3; 2: a = 761.18(9), b = 1135.69(9), c = 1080.89(9) pm, beta= 92.276(7)°, V = 0.9337(2) nm3. 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). Thermogravimetric analysis in air of 1 indicated a loss of water of crystallization between 154 and 212 °C and in 2 between 169 and 222 °C.

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