Crystal structure and magnetic property of a metal-organic framework (MOF) containing double-stranded chain with metallomacrocycles and dinuclear Mn(II) subunits

One new metal-organic framework (MOF) {[Mn2L2(CH3OH)2.5H2O]·2.5CH3OH·5.5H2O}n 1 was prepared by assembling from the newly synthesized semirigid benzimidazole carboxylate ligand 2,6-bis(6-carboxy-4-methyl-2-propyl-benzimidazol-1-ylmethyl)benzene (H2L) with Mn(II) ion. It contained novel 1D double-stranded coordinating chain with metallomacrocycle and dinuclear Mn(II) subunit bridged by carboxylate ions. Variable temperature susceptibility measurements (2–300 K) revealed an antiferromagnetic coupling interaction (J = −0.97 cm−1). The crystal structure and the magnetic behavior of 1 were discussed in detail.