{[Co2(ndc)2(bpee)2](bpee)}: a 3D multifunctional MOF

Abstract

A new multifunctional 2-fold interpenetrated 3D metal–organic framework (MOF) {[Co₂(ndc)₂(bpee)₂](bpee)} has been synthesized by a solvothermal technique from a mixture of Co(NO₃)₂, 6H₂O, ndc and bpee with addition of 1 ml Et₃N (ndc = 2,6-napthalene dicarboxylic acid, bpee = 4,4′-bipyridine ethylene). X-ray crystal structure analysis reveals that complex 1 was crystallized in the P space group with the Schlafli symbol {3⁶.4¹⁸.5³.6}.{3⁶.4¹⁸.5³.6}. The micro-porous complex contains large void space for accommodation of guest bpee after interpenetration. Adsorption study with the evacuated complex indicates that it selectively adsorbs 40.5 ml g⁻¹ CO₂ and 29 ml g⁻¹ benzene but can't adsorb N₂ and can be potentially used for benzene storage. Guest dependent magnetic behavior of the complex has been studied. Magnetic ordering is enhanced on removal of guest. The evacuated complex is a soft magnet and exhibits a square hysteresis loop.