Issue 37, 2021

Accessing the triplet manifold of naphthalene benzimidazole–phenanthroline in rhenium(i) bichromophores

Abstract

The steady-state and ultrafast to supra-nanosecond excited state dynamics of fac-[Re(NBI-phen)(CO)3(L)](PF6) (NBI-phen = 16H-benzo[4′,5′]isoquinolino[2′,1′:1,2]imidazo[4,5-f][1,10]phenanthrolin-16-one) as well as their respective models of the general molecular formula [Re(phen)(CO)3(L)](PF6) (L = PPh3 and CH3CN) has been investigated using transient absorption and time-gated photoluminescence spectroscopy. The NBI-phen containing molecules exhibited enhanced visible light absorption with respect to their models and a rapid formation (<6 ns) of the triplet ligand-centred (LC) excited state of the organic ligand, NBI-phen. These triplet states exhibit an extended excited state lifetime that enable the energized molecules to readily engage in triplet–triplet annihilation photochemistry.

Graphical abstract: Accessing the triplet manifold of naphthalene benzimidazole–phenanthroline in rhenium(i) bichromophores

Supplementary files

Article information

Article type
Paper
Submitted
13 Jul 2021
Accepted
08 Aug 2021
First published
11 Aug 2021

Dalton Trans., 2021,50, 13086-13095

Author version available

Accessing the triplet manifold of naphthalene benzimidazole–phenanthroline in rhenium(I) bichromophores

K. A. Wells, J. E. Yarnell, S. Sheykhi, J. R. Palmer, D. T. Yonemoto, R. Joyce, S. Garakyaraghi and F. N. Castellano, Dalton Trans., 2021, 50, 13086 DOI: 10.1039/D1DT02329B

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