Manganese(II) one-dimensional coordination polymers with nitrobenzoato or nitrosalicylato bridges: Syntheses, crystal structures, and magnetic properties

摘要

Five polymericMn(II) complexes with bridging carboxylato groups were prepared and structurally characterized. The bridging carboxylato ligand in double-chain coordination polymeric structures of [Mn(μ-3-NO_2bz)_2 (bipy)]_n·nH_2O, [Mn(μ-3,5-(NO_2)_2bz)_2(bipy)]_n, [Mn(μ-5-(NO_2)sal)_2(bipy)]_n, and [Mn(μ-5-(NO_2)sal)_2(phen)]_n, where 3-NO_2bz~- = 3-nitrobenzoate, 3,5-(NO_2)_2bz~- = 3,5-dinitrobenzoate, 5-(NO_2)sal~- = 5-nitrosalicylate, bipy = 2,2'-bipyridine and phen = 1,10-phenanthroline, exhibits the syn-anti bidentate bridging mode. The Mn(II) atom in the coordination polymer [Mn(l-4-NO_2bz)(4-NO_2bz)(phen)(H_2O)]_n, where 4-NO_2bz = 3-nitrobenzoate, is coordinated by terminal carboxylato groups in the syn monodentate mode but two Mn(II) atoms are connected with bridging 4-nitrobenzoate ligands in the anti-anti bidentate bridging mode. The magnetic susceptibility and magnetization data confirm that weak exchange interactions of an antiferromagnetic nature apply in these complexes.