Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 17, Pages 3980-3985Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b01736
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Funding
- NSFC [21373004, 21573074]
- Science and Technology Commission of Shanghai Municipality [15520711500, 15ZR1411700, 15ZR1410100]
- Program of Introducing Talents of Discipline to Universities [B12024]
- JoRRIS project
- Key Laboratory for Ultrafine Materials of The Ministry of Education, East China University of Science and Technology
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The fluorescence-phosphorescence dual solvoluminescence (SL) of water-soluble metal nanoclusters (NCs) at room temperature was successfully achieved by a simple solvent-stimulated strategy. The strong interaction between carboxylate ligands and the metal core at the nanoscale interface not only induces rigid conformations of carbonyl groups but also affords a perfect carbonyl cluster that acts as an exact chromophore of metal NCs for aggregation-induced emission (ME) mechanics. The clustering of carbonyl groups bearing on the polymer backbone chain is promoted by newly discovered n -> pi* noncovalent interactions. The efficient delocalization of electrons in overlapped C=O double bonds between neighboring carbonyl groups triggered by strong n -> pi* interactions in the polymer cluster accounts for its unique SL properties, especially the abnormal phosphorescence. This was further confirmed by controlled experiments for the presence of intersystem crossing (ISC) transitions. The results provide novel insights for understanding the complex SL process and open up a new way to study the inherent mechanism of SL by broadening the application of metal NCs.
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