Reversible Luminescence Vapochromism and Crystal-to-Amorphous-to-Crystal Transformations of Pseudopolymorphic Cu(I) Coordination Polymers

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• 作者：Gihaeng Kang ; Youngeun Jeon ; Kang Yeol Lee ; Jineun Kim ; Tae Ho Kim
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：5183-5187
• 全文大小：323K
• ISSN：1528-7505

文摘

Four solvent-responsive one-dimensional copper(I) coordination polymers (CPs), namely, {[Cu₄I₄L(MeCN)₂]路CH₂Cl₂}_n (1), {[Cu₄I₄L(MeCN)₂]路CHCl₃}_n (2), {[Cu₄I₄L(MeCN)₂]路0.5p-xylene}_n (3), and [Cu₄I₄L(MeCN)₂]_n (4), were prepared by reaction of CuI with N,N鈥?bis[2-(cyclohexylthio)ethyl]pyromellitic diimide (L) via self-assembly under varying solvent conditions. CPs 1鈥?b>4, which are pseudopolymorphic supramolecular isomers derived from solvent molecules, are composed of Cu₄I₄ cubane clusters. The ligands in CPs 1鈥?b>3 adopted a syn-conformation, whereas in CP 4 they were observed in the anti-conformation. This occurred via syn to anti transitions upon heating, followed by exposure to MeCN vapor. In addition, a reversible anti to syn transition was achieved by agitating in mixed organic solvents. It was shown that ligand transition from the syn- to the anti-conformation occurred through crystal-to-amorphous-to-crystal transformations. Furthermore, CPs 1鈥?b>3 exhibited reversible solvent exchange and crystal transformation by exposure to vapors from volatile organic compounds.