Novel CuII, CoII and PbII supramolecular networks of pyridine-2,6-dicarboxylate (pydc) in cooperation with a bent dipyridyl spacer via coordinative, hydrogen-bonding and aromatic stacking interactions was written by Du, Miao;Cai, Hua;Zhao, Xiao-Jun. And the article was included in Inorganica Chimica Acta in 2006.HPLC of Formula: 15420-02-7 This article mentions the following:
Reaction of M(OAc)2 (MII = CuII for 1, CoII for 2, and PbII for 3) with pyridine-2,6-dicarboxylic acid (H2pydc) in presence of a dipyridyl spacer, 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo), affords three novel metal-organic supramol. networks, [Cu2(bpo)(pydc)2(H2O)3]·2.75H2O (1), [Co(bpo)(pydc)(H2O)2]·(H2O) (2) and [Pb(pydc)]n (3), which were structurally determined by single-crystal x-ray diffraction. The dimeric Cu-pydc coordination framework bridged by a bpo spacer in 1 is hydrogen-bonded to four others to result in a two-dimensional (2-D) sheet array. The neutral monomeric mols. in 2 have an ordered 3-dimensional stacking stabilized via hydrogen bonds and significant π-π interactions in the lattice, possessing large porous channels with the inclusion of guest solvates. In coordination polymer 3, the PbII ion takes the unusual distorted capped trigonal prismatic geometry (PbNO6) and each pydc dianion binds to four PbII centers to form a 2-dimensional infinite network. The thermal stabilities of these complexes also were studied. In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7HPLC of Formula: 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.HPLC of Formula: 15420-02-7