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Metallophilic Bond‐Induced Quenching of Delayed Fluorescence in Au 25 @BSA Nanoclusters
Author(s) -
Yu Pyng,
Wen Xiaoming,
Toh YonRui,
Huang Jane,
Tang Jau
Publication year - 2013
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/ppsc.201200111
Subject(s) - nanoclusters , intersystem crossing , chemistry , fluorescence , photochemistry , electron transfer , ion , quenching (fluorescence) , metal ions in aqueous solution , bovine serum albumin , excited state , organic chemistry , singlet state , biochemistry , physics , quantum mechanics , nuclear physics
The metallophilic bond is a weak interaction between closed‐shell ions and has been widely used a probe for various sensing of toxic chemicals for environmental safety concerns. Here, the interaction between Au nanoclusters (NCs) and metallic ions (mercury (Hg 2+ ) and copper (Cu 2+ ) ions) is explored using steady‐state and time‐resolved luminescence and transient absorption measurements. For Hg 2+ ions, the delayed fluorescence (DF) of bovine serum albumin (BSA) protected Au 25 (Au 25 @BSA) NCs is quenched via an effective triplet state electron transfer through the metallophilic bond. However, the Cu 2+ ions do not alter the DF in Au 25 @BSA NCs because of the absence of the metallophilic interaction. Furthermore, for Au 8 @BSA and Au 10 @histidine, in which there are no Au + ions on the surface, the fluorescence is not quenched by Hg 2+ ions. Such a novel triplet electron transfer process through metallophilic bonds are observed and reported for the first time. The reduction of the reverse intersystem crossing is the crucial for Hg 2+ ion sensing in the fluorescent Au 25 @BSA NCs.