Deciphering Photoluminescence Dynamics and Reactivity of the Luminescent Metal-Metal-Bonded Excited State of a Binuclear Gold(I) Phosphine Complex Containing Open Coordination Sites

Chensheng Ma, Chris Tsz Leung Chan, Wai Pong To, Wai Ming Kwok, Chi Ming Che

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)

Abstract

KGaA, Weinheim. Luminescent metal complexes having open coordination sites hold promise in the design of sensory materials and photocatalysts. As a prototype example, [Au2(dcpm)2)]2+ (dcpm = bis(dicyclohexylphosphanyl) is known for its intriguing environmental sensitive photoluminescence. By integrating a range of complementary ultrafast time-resolved spectroscopy to interrogate the excited state dynamics, this study uncovers that the events occurring in extremely rapid timescales and which are modulated strongly by environmental conditions play a pivotal role in the luminescence behavior and photochemical outcomes. Formed independent of the phase and solvent property within 0.15 ps, the metal-metal bonded 35dσ6pσ state is highly reactive possessing strong propensity toward increasing coordination number at AuI center, and with 510 ps lifetime in dichloromethane is able to mediate light induced C-X bond cleavage.
Original languageEnglish
Pages (from-to)13888-13893
Number of pages6
JournalChemistry - A European Journal
Volume21
Issue number40
DOIs
Publication statusPublished - 1 Sep 2015

Keywords

  • femtosecond time-resolved fluorescence
  • gold
  • photocleavage
  • substrate binding
  • transient absorption

ASJC Scopus subject areas

  • Chemistry(all)

Cite this