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

Abstract

A heterobimetallic coordination polymer [Au 4 (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 CH 3 CN/CH 2 Cl 2 (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 [Au 4 Ag 2 S 2 ] cluster units are connected by [Au 2 (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 (λ ex = 375 nm). Coordination polymer 1 exhibited a rapid, selective, reversible, and visible vaporchromic response on exposure to methanol (MeOH) vapor with its emission shifting to a more intense green (530 nm, λ ex = 388 nm) with QY = 46.8% and τ = 1.24 μs (λ ex = 375 nm). A polymethylmethacrylate film containing 1 served as a reversible chemical sensor for the sensitive detection of MeOH in air.

Unveiling dual catalysis enhancement of a pyridinium-containing Zn(ii) coordination polymer in aerobic photooxidation of organic substrates and selective photoreduction of CO2

“…Coordination polymers (CPs) are classic hybrid materials that are commonly obtained through coordination reactions of ligands and metals, and have been used in versatile applications including energy storage, 26,27 photodynamic therapy, 28,29 sensing, 30,31 electrocatalysis, 32,33 and photocatalysis. 34,35 Properties of CPs are highly related to constituent ligands and metals.…”