Cation polymer-induced aggregation of water-soluble Au(i)–thiolate complexes and their photoluminescence properties

Abstract

Au(I)-thiolate complexes are a new class of aggregation-induced emission (AIE) material. Here we demonstrate a new aggregation strategy of water-soluble Au(I)-thiolate complexes induced by cation polymers at optimized pH values....

Aggregation‐Induced Emission (AIE) of Au(I)‐GSH Complexes is Activated by Optical Manipulation and Exhibits Surprising 780 nm Emission

“…The Au 4f 7/2 binding energy (BE) of Au(I)‐GSH complexes is located at 84.3 eV, which is higher than for Au (0) (83.8 eV) and lower than for Au (III) (85 eV), as shown in Figure S1 (Supporting Information). According to previous reports, [ 10,16 ] Au(I)‐GSH complexes primarily comprise Au 2 (GSH) 2 , Au 4 (GSH) 4 , and Au 11 (GSH) 11 , lacking an Au (0) core, this contrasts with the bright Au(0)@Au(I)NCs formed by the encapsulation of Au(0) within Au(I)‐thiolate motifs. The UV–Vis absorption spectra of the solution of Au(I)‐GSH complexes are shown as Figure S2 (Supporting Information), with weak absorption at 405 nm, indicating that Au(I)‐GSH complexes can dissolve well in neutral water solution.…”

“…This surprising emission wavelength is different from any that have been reported, and has a red‐shift of 120 nm than the longest. [ 16 ] To better explain this phenomenon, it deserves more attention.…”

Aluminum-Mediated Polymerization of Allylic Ylides toward α,ω-Functionalized C3 Polymers with Enhanced Nontraditional Intrinsic Luminescence

“…As an emerging new class of luminescent materials, NTIL polymers have recently attracted considerable attention. NTIL polymers have been widely used in biomedicine, − chemical sensors, organic light-emitting diodes (OLEDs), , and chemo-and bioprobes. − These polymers, characterized by nonconjugated backbones that incorporate auxo chromophores or unconventional chromophores, exhibit unique blue fluorescence, without a notorious aggregation-caused quenching effect, and demonstrate high aggregated state emissions, structure turnability, and chain flexibility. ,, We have previously demonstrated that C3 polymers, poly­(3-methyl-propenylidene) and poly­(2-phenyl-propenylidene), exhibit NTIL by through-space interaction between the allylic segments. When halogen atoms participate in covalent bonds, there is a redistribution of electron density, and specifically, the electron density of an atom in its outer region decreases along the axis of the covalent bond, while it increases in the direction perpendicular to the bond. − This phenomenon leads to the hypothesis that incorporating halogen atoms could facilitate the staking of allylic units and consequently could modulate the fluorescence properties of C3 polymers.…”

A supramolecular assembly strategy towards organic luminescent materials

“…Au( i )–thiolate complexes are a new type of AIE material, which can be produced by the reduction of Au( iii ) to Au( i ) by thiols. Based on this point, they 35 synthesized a novel non-luminescent anionic water-soluble Au( i )–GSH (GSH = l -glutathione in the reduced form) complex, and introduced a cationic polymer called poly(diallyldimethylammonium chloride) ( PDDA ). When in a strong alkaline environment, GSH was completely deprotonated, and the high negative charge density on the surface of the Au( i )–GSH complex strongly attracted it to PDDA , thus forming uniform necklace-like aggregates and realizing strong red luminescence.…”