Accessing the triplet manifold of naphthalene benzimidazole–phenanthroline in rhenium(i) bichromophores. Issue 37 (25th August 2021)

• Record Type: Journal Article
• Authors: Wells, Kaylee A.; Yarnell, James E.; Sheykhi, Sara; Palmer, Jonathan R.; Yonemoto, Daniel T.; Joyce, Rosalynd; Garakyaraghi, Sofia; Castellano, Felix N.
• Is Part Of: Dalton transactions. Volume 50:Issue 37(2021)
• Page Start: 13086
• Page End: 13095
• Publication Date: 2021-08-25
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt02329b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Two new Re(i ) metal–organic bichromophores containing a phenanthroline appended perinone are shown to quantitatively generate extremely long-lived triplet ligand-centered excited states. 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 CH3 CN) 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.