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

Resultado de la investigación: Contribución a una revistaArtículo

16 Citas (Scopus)

Resumen

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).

Idioma originalInglés
Páginas (desde-hasta)3929-3935
Número de páginas7
PublicaciónJournal of Physical Chemistry A
Volumen119
N.º17
DOI
EstadoPublicada - 30 abr 2015

Áreas temáticas de ASJC Scopus

  • Química física y teórica

Huella Profundice en los temas de investigación de 'Dual Emission of a Novel (P,N) Re<sup>I</sup> Complex: A Computational and Experimental Study on [P,N-{(C<sub>6</sub>H<sub>5</sub>)<sub>2</sub>(C<sub>5</sub>H<sub>4</sub>N)P}Re(CO)<sub>3</sub>Br]'. En conjunto forman una huella única.

  • Citar esto