Effect of pore structures on selective gas sorption behavior of ultramicroporous MOFs

Abstract

Synthesis, crystal structures and selective gas sorption properties of two new MOFs based on pyrimidyl-5-carboxylate (pmc) are reported.[Co3Cl4(pmc)(2)(CH3OH)(4)] (1) possesses pillared layer-type network and narrow one-dimensional channels. In [Fe-3(O)(pmc)(5.3)(O2CH)(0.7)]center dot DMF (2), the trinuclear basic carboxylate units form a uninodal 5-connected network with isolated cage-like pores. 1 Shows the selective sorption of hydrogen against nitrogen at 77 K and CO2 against CH4 at 195 K. For 2, a selective sorption is observed only at 77 K, and the sorption is almost indiscriminate at 195 K. This difference is believed to originate from the different pore structures of 1 and 2. 0 2011 Elsevier Inc. All rights reserved.