{[CuI(bpo)2(CH3CN)]ClO4 · CH3CN · (H2O)1.5}n: a novel three-dimensional open framework with large rectangular channels assembled from copper(I) perchlorate and 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo)

In the first CuI coordination polymer containing an angular bipyridine-type ligand 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo), {[Cu(bpo)2(CH3CN)]ClO4 · CH3CN · (H2O)1.5}n (1), the bpo molecules exhibit different monodendate and bidendate bridging modes in binding to the CuI center, forming a novel 1-D infinite comb-like polymeric chain with the monodendate ligands on one side. The most striking feature of this structure is the formation of a 3-D porous network with large rectangular channels through two distinct types of inter-chain π–π stacking interactions, which was further stabilized by weak hydrogen-bonding interactions.