Abstract
The photoluminescence of gold thiolate clusters brings about many potential applications, but its origin is still elusive because of its complexity. A strategy in understanding the structure–properties relationship is to study closely related neutral gold thiolate coordination polymers (CPs). Here, a new CP is reported, [Au(m-SPhCO2H)]n. Its structure is lamellar with an inorganic layer made of Au–S–Au–S helical chains, similar to the [Au(p-SPhCO2H)]n analog. An in-depth study of its photophysical properties revealed that it is a bright yellow phosphorescent emitter with a band centered at 615 nm and a quantum yield (QY) of 19% at room temperature and in a solid state. More importantly, a comparison to the para-analog, which has a weak emission, displayed a strong effect of the position of the electron withdrawing group (EWG) on the luminescent properties. In addition, [Au(m-SPhCO2H)]n CPs were mixed with organic polymers to generate transparent and flexible luminescent thin films. The ability to tune the emission position with the appropriate contents makes these nontoxic polymer composites promising materials for lighting devices.
Highlights
Gold thiolate clusters, Aun(SR)m, are an intriguing family of materials that bridges the gap between molecular species and functionalized nanoparticles [1,2,3,4]
Pure and highly crystalline powder of [Au(m-SPhCO2H)]n coordination polymers (CPs) was synthesized under hydrothermal conditions
While its structure is similar to the analog [Au(p-SPhCO2H)]n, its luminescence is much more intense, displaying the effect of shorter Au–Au distances and the position of the electron withdrawing group (EWG) on the phenyl ring of the ligand
Summary
Aun(SR)m, are an intriguing family of materials that bridges the gap between molecular species and functionalized nanoparticles [1,2,3,4]. One of their attractive properties is their photoluminescence, which brings about many potential applications in areas such as chemical sensing, bioimaging, cell labeling, phototherapy, and drug delivery [5,6,7,8]. Gold thiolate CPs are the synthesis precursors of gold thiolate clusters and are easier to obtain through their isolation before the addition of a reducing agent
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