Structural and photophysical properties of [(CO)3(phen)Re(μ-Br)Re(phen)(CO)3]+[(CO)3Re(μ-Br)3Re(CO)3]-: Where does its luminescence come from?

Hector Gallardo, Marjorie Cepeda-Plaza, Santi Nonell, Germán Günther, Eduardo Chamorro, Nancy Pizarro, Andrés Vega

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The multimetallic complex [[(CO)3(phen)Re(μ-Br)Re(phen)(CO)3][(CO)3Re(μ-Br)3Re(CO)3]]·CH2Cl2 was prepared by direct reaction of (Re(CO)3(THF)Br)2 (THF: tetrahydrofuran) and 1,10-phenanthroline in a 1:1 ratio, followed by recrystallization in dichloromethane. The compound is an ionic salt where both, cation and anion, are bimetallic complexes. Inside both of them the ReI centers are bridged by one or three bromides respectively. The compound has an absorption band centered at 375 nm in CH2Cl2, which has been assigned to a MLCT band. Excitation at 375 nm produces luminescent emission at 608 nm. Comparison of these results with closely related rhenium complexes, in addition to Time Dependant-DFT analysis, allow us to propose the [(CO)3(phen)Re(μ-Br)Re(phen)(CO)3]+ cation as main responsible for luminescence. Luminescence lifetime and singlet oxygen formation quantum yield suggest also that the emissive excited state has a triplet character.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalPolyhedron
Volume97
DOIs
Publication statusPublished - 12 Jun 2015

Keywords

  • Cation
  • Crystal structure
  • Luminescence
  • Multimetallic complex
  • Re

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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