Gas Adsorption, Magnetism, and Single-Crystal to Single-Crystal Transformation Studies of a Three-Dimensional Mn(II) Porous Coordination Polymer

摘要

A porous coordination polymer {[Mn2(DBIBA)3]NO3·3DMF· 4H_2O}_n (1) [DBIBAH = 3,5-di(1H-benzo[d]imidazol-1-yl)benzoic acid] has been synthesized solvothermally and structurally characterized by single-crystal X-ray diffraction. The following four new coordination polymers {[Mn_2(DBIBA)_3]·ClO_4·DMF·H_2O}_n (2), {[Mn_2(DBIBA)_3]·Cl·DMF·8H_2O}_n (3), {[Mn_2(DBIBA)_3]·NO_3·CH_3OH·5H_2O}_n (4) and {[Mn_2(DBIBA)_3]·NO_3·_3CH_3COCH_3·7H_2O}_n (5) have been synthesized from 1 via anion/solvent exchange protocols in a single-crystal to single-crystal fashion at room temperature. Gas sorption studies for desolvated compounds 1, 2, and 3 show that CO_2 uptake capacity is entirely dependent upon the size of the anion present in the framework. Complex 1 also exhibits antiferromagnetic properties below 17 K, confirmed through magnetic susceptibility measurements.