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Title: Deactivation routes in gold(I) polypyridyl complexes: internal conversion Vs fast intersystem crossing
Author: Aguiló Linares, Elisabet
Moro, Artur J.
Outis, Mani
Pina, Joan
Sarmento, Daniela
Seixas de Melo, J.S.
Rodríguez Raurell, Laura
Lima, João Carlos
Keywords: Or
Compostos d'or
Gold compounds
Issue Date: 10-Oct-2018
Publisher: American Chemical Society
Abstract: An electronic spectral and photophysical characterization of three gold(I) complexes containing heterocyclic chromophores differing in the number and arrangement of pyridine rings (pyridine, bipyridine and terpyridine, with the acronyms pD, bD and tD respectively) was performed. Quantum yields of fluorescence, internal conversion and triplet state formation, together with the rate constants for singlet to triplet intersystem crossing, S1~~~S0 internal conversion and fluorescence were measured in order to equate the impact of fast triplet state formation on the amount of triplets formed. The results showed a correlation between the increase on the measured decay values of S1 (leading to the main formation of T1) and the increase in the Charge Transfer (CT) character of the lowest energy transition, as evaluated from the orthogonality of the frontier orbitals. The measured triplet state quantum yields range from ~50-60 % to 70%, while the intersystem crossing rate constants differ by almost 2 orders of magnitude, from 9.4 x109 s-1 for tD to 8.1 x1011 s 1 for bD. This constitutes an evidence for the existence of a correlation between the intersystem crossing and the internal conversion mechanisms.
Note: Versió postprint del document publicat a:
It is part of: Inorganic Chemistry, 2018, vol. 57, num. 21, p. 13423-13430
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ISSN: 0020-1669
Appears in Collections:Articles publicats en revistes (Química Inorgànica i Orgànica)

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