Dual Emission of a Novel (P,N) ReI Complex: A Computational and Experimental Study on [P,N-{(C6H5)2(C5H4N)P}Re(CO)3Br]

Nancy Pizarro, Mario Duque, Eduardo Chamorro, Santi Nonell, Jorge Manzur, Julio R. De la Fuente, Germán Günther, Marjorie Cepeda-Plaza, Andrés Vega

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The spectroscopic, electrochemical, and photophysical properties of the new complex [P,N-{(C6H5)2(C5H4N)P}Re(CO)3Br] are reported. The UV-vis spectrum in dichloromethane shows an absorption maximum centered at 315 nm and a shoulder at 350 nm. These absorption bands have been characterized to have MLCT character. Excitation at both wavelengths (maximum and shoulder) leads to an emission band centered at 550 nm. Cyclic voltammetry experiments show two ill-defined irreversible oxidation waves around +1.50 and 1.80 V that are assigned to ReI/ReII and ReII/ReIII couples whereas an irreversible reduction signal centered at -1.80 V is likewise assigned to a ligand reduction process. These results support the proposal of the MLCT nature of the states implied by the emission of the complex. The luminescent decay fits to a biexponential function, where the lifetimes and emission quantum yields are dependent on the solvent polarity. DFT calculations suggest that dπ → π∗pyridine and dπ → π∗phenyl excited states may account for the existence of two decay lifetimes. (Graph Presented).

Original languageEnglish
Pages (from-to)3929-3935
Number of pages7
JournalJournal of Physical Chemistry A
Volume119
Issue number17
DOIs
Publication statusPublished - 30 Apr 2015

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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