{[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) was written by Du, Miao;Lam, Chi-Keung;Bu, Xian-He;Mak, Thomas C. W.. And the article was included in Inorganic Chemistry Communications in 2004.Reference of 15420-02-7 This article mentions the following:
In the 1st CuI coordination polymer containing an angular bipyridine-type ligand 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo), {[Cu(bpo)2(MeCN)]ClO4·MeCN·(H2O)1.5}n (1), bpo exhibits different monodentate and bidentate bridging modes in binding to the CuI center forming a novel 1-dimensional infinite comb-like polymeric chain with the monodentate ligands on one side. The most striking feature of this structure is the formation of a 3-dimensional porous network with large rectangular channels through two distinct types of inter-chain π-π stacking interactions, which was further stabilized by weak H-bonding interactions. In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7Reference of 15420-02-7).
2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Reference of 15420-02-7