M(H2O)2(4,4′‐bipy)[C6H4(COO)2]·2H2O (M = Mn2+, Co2+) – Zwei isotype Koordinationspolymere mit Schichtstruktur

Abstract M(H 2 O) 2 (4,4′‐bipy)[C 6 H 4 (COO) 2 ]·2H 2 O (M = Mn 2+ , Co 2+ ) – Two Isotypic Coordination Polymers with Layered Structure Monoclinic single crystals of Mn(H 2 O) 2 (4,4′‐bipy)[C 6 H 4 (COO) 2 ]·2H 2 O ( 1 ) and Co(H 2 O) 2 (4,4′‐bipy)[C 6 H 4 (COO) 2 ]· 2H 2 O ( 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, β = 92.67(2)°, V = 0.9572(2) nm 3 ; 2 : a = 761.18(9), b = 1135.69(9), c = 1080.89(9) pm, β = 92.276(7)°, V = 0.9337(2) nm 3 . M 2+ (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 : M–O 219.5(2), 220.1(2) pm, M–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). M 2+ and [C 6 H 4 (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.