LAUSR

Two novel coordination polymers (CPs), namely, {[Mn2(HL)(DMF)2(H2O)]·H2O}n (1) and {[Mn2(HL)(bibp)(H2O)]·H2O}n (2) {H5L = 2,4-di(2′,5′-dicarboxylphenyl)benzoic acid, bibp = 4,4′-bis(imidazolyl)biphenyl}, were prepared under solvothermal conditions by a mixed-ligand strategy. The structural analysis shows that 1 has a 2D sheet structure with a 2-nodal (3,5)-connected {3·4·5}{32·4·5·62·74} topology, which is further expanded into a 3D supermolecular framework by hydrogen bonding between 2D layers, while 2 exhibits a 3D framework with a 3-nodal (3,3,12)-connected network with a point Schlafli symbol of {3·4·5}2{3·52}2{32·414·510·626·76·86·92}. Moreover, temperature dependent magnetic susceptibility and magnetization measurements revealed that 1 and 2 show weak antiferromagnetic interactions in the Mn chains with different spin topologies, which consist of repeating sequences of –J1J2– for 1 and –J1J2J3J2– for 2. Meanwhile, their superexchange coupling constants obtained using the PHI program further indicate that the magnetic interactions have an –AF–AF– repeating sequence for 1 and an –F–AF–F–AF– repeating sequence for 2, which are attributed to the structural differences of CPs 1 and 2 and are consistent with the magnetic results of structural analysis.