∞1[MII(4,4′-bipy)(H2O)4](ADC)•4H2O with MII = Mn, Fe, Co, Cu: Four New Coordination Polymers based on 4,4′-Bipyridine (4,4′-bipy) and Acetylenedicarboxylate (ADC2-)

By slow diffusion of 4,4'-bipyridine (4,4'-bipy) into a solution of a respective metal salt and acetylenedicarboxylic acid (H(2)ADC), single crystals of four new coordination polymers (1)(infinity)[M-II(4,4 '-bipy)(H2O)(4)](ADC)center dot 4H(2)O (M-II = Mn, Fe, Co; P (1) over bar, Z = 1) (1-3) and (1)(infinity)[Cu(4,4 '-bipy)(H2O)(4)](ADC)center dot 4H(2)O](ADC)-4H(2)O (C2/c, Z = 4) (4) were obtained. In all compounds octahedral M-II(H2O)(4)N-2 units are connected by 4,4'-bipyridine ligands to form chain-like polymers. In 4 these octahedra are elongated due to Jahn-Teller distortion. The acetylenedicarboxylate dianions are bound by hydrogen bonds to the [M-II(4,4'-bipy)(2/2)(H2O)(4)] chains to form a 3D network. Surprisingly, the acetylenedicarboxylate dianions are not part of the first coordination sphere of the transition metal ions.