One-Dimensional Heterobimetallic Au/Ag Coordination Polymer Showing a Selective, Reversible, and Visible Vapor-Chromic Photoluminescent Response toward Methanol

• Published in: Inorganic chemistry 2023-04, Vol.62 (16), p.6439-6446
• Main Authors: Feng, Mengyao, Liu, Fuyuan, Yang, Ningwen, Yu, Jiayao, Yang, Wei, Young, David James, Cao, Xiang-Qian, Li, Hong-Xi, Ren, Zhi-Gang
• Format: Article
• Language: English
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.3c00429

A heterobimetallic coordination polymer [Au4(dppmt)4(AgCl)2] n (1) incorporating an in situ generated P–S ligand (dppmtH) was synthesized from the solvothermal reaction of Au­(tht)­Cl, AgCl, and dpppyatc in CH3CN/CH2Cl2 (dppmtH = (diphenylphosphino)­methanethiol, tht = tetrahydrothiophene, dpppyatc = N,N-bis­((diphenylphosphaneyl)­methyl)-N-(pyridin-2-yl)-amino-thiocarbamide). The structure of 1 contains a one-dimensional helical Au–Au chain in which the unique [Au4Ag2S2] cluster units are connected by [Au2(dppmt)2] dimers. Upon excitation at 343 nm, 1 exhibited cyan (495 nm) phosphorescent emission at quantum yield (QY) = 22.3% and τ = 0.78 μs (λex = 375 nm). Coordination polymer 1 exhibited a rapid, selective, reversible, and visible vapor-chromic response on exposure to methanol (MeOH) vapor with its emission shifting to a more intense green (530 nm, λex = 388 nm) with QY = 46.8% and τ = 1.24 μs (λex = 375 nm). A polymethylmethacrylate film containing 1 served as a reversible chemical sensor for the sensitive detection of MeOH in air.