PH-Controlled Construction of Cu(I) Coordination Polymers: In Situ Transformation of Ligand, Network Topologies, and Luminescence and UV-vis-NIR Absorption Properties was written by Fang, Zhen-Lan;He, Jian-Gang;Zhang, Qi-Sheng;Zhang, Qi-Kai;Wu, Xiao-Yuan;Yu, Rong-Min;Lu, Can-Zhong. And the article was included in Inorganic Chemistry in 2011.Electric Literature of C12H8N4O This article mentions the following:
Two coordination polymers, [CuI3(L1)I3]n (1, L1 = 2,5-bis(4-pyridyl)-1,3,4-oxadiazole) and [CuI3(L2)I2]n (2, L2 = 2,5-bis(4-pyridyl)-1,2,4-triazolate), are controllably formed by using aqueous ammonia to regulate the pH value of the reaction involving CuI and L1. L2 of 2 is in situ generated from the ring transform of L1 when increase the pH value of the reaction. 1 Exhibits a 2-dimensional layer, while 2 shows 3-dimensional MOFs with a novel 3-nodal 4,4,5-connected net topol. of an unprecedented Point (Schlafli) symbol: (4闁?2闁?2闁?)(54闁?2)(43闁?闁?6). Although both 1 and 2 are built of CuI and similar ligands, different arrangements of CuI chains and ligands endow them with different phys. properties. 1 Displays a strong pure red luminescence emission, while 2 is non-luminescent and shows a broad absorption band covering the whole UV-visible-NIR spectrum range. The emissive excited states of 1 and the charge transitions of the optical absorption for 2 are solved by DFT calculations In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7Electric Literature of C12H8N4O).
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闁荤姾娅eΛ纭俵闂? in pyridine vs. 150 kJ闁荤姾娅eΛ纭俵闂? in benzene). Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. Electric Literature of C12H8N4O