校園頭條

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化學系王志傑特聘教授發表最新期刊論文

One-dimensional chains based on linear tetranuclear copper(I) units: reversible structural transformation and luminescence change

作者：Chih-Tung Yang, Xiang-Kai Yang, Ji-Hong Hu, Wei-Te Lee, Tsun-Ren Chen, Chih-Chieh Wang and Jhy-Der Chen

CrystEngComm (SCI)

卷數：22

期數：19

頁碼：3322-3328

出版日期：May 2020

Abstract

One-pot solvothermal reactions of 2-aminopyridine, triethylorthoformate and sodium hydroxide with CuX (X = Br, and I) in dimethylformamide (DMF) and methanol (MeOH) afforded extended metal chains based on the linear tetracopper units, {[Cu₄Br₂(Dpyf)₂]·DMF}_n, 1, and [Cu₄I₂(Dpyf)₂]_n, 2, which were structurally identified by X-ray crystallography. Complexes 1 and 2 present closed-shell Cu(I)–Cu(I) interactions that are supported by formamidinate ligands, resulting in a face-to-side configuration and a face-to-face configuration, respectively, for the tetranuclear units. Complexes 1 and 2 represent the first example of one-dimensional (1D) coordination polymers that are based on linear tetracopper units. Moreover, complexes 1 and 2 can be regarded as copper(I) halide aggregates with the unique Cu₄Br₂²⁺ and Cu₄I₂²⁺ cations extending into a 1D zigzag chain and a looped chain, respectively. Complexes 1 and 2 show broad emissions at 570 and 549 nm, respectively, which can most probably be ascribed to 3d(Cu) → π* metal to ligand charge transfer. Reversible crystal-to-crystal transformation and luminescence change were observed for complex 1 upon solvent exchange, which can be regarded as a potential luminescent sensor for selective detection of water and methanol.

Keywords

Coordination Polymers; Crystal-Structures; Complexes; Anions; Chemistry; Contacts

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