Coexistence of MLCT Excited States of Different Symmetry upon Photoexcitation of a Single Molecular Species

Journal article


Publication Details

Author(s): Oviedo PS, Pieslinger GE, Baraldo LM, Cadranel A, Guldi DM
Journal: Journal of Physical Chemistry C
Publication year: 2019
Volume: 123
Journal issue: 6
Pages range: 3285-3291
ISSN: 1932-7447


Abstract

Photoexcitation of [Ru(tpy)(bpy)(mu-CN)Ru-(py)(4)Cl](2+) ([RuRu](2+)) at 387 nm results in the population of two (MLCT)-M-3 excited states of different symmetry that coexist on the nanosecond scale. Common to both states is an excited electron in a tpy-based orbital. Their configuration differs in the position of the hole. In one excited state, (3)MLCTz, the hole sits in an orbital parallel to the intermetallic axis allowing for a strong metal-metal electronic interaction. As a result, (3)MLCTz is highly delocalized over both metal centers and shows an intense photoinduced intervalence charge transfer (PIIVCT) NIR signature. In the other excited state, (3)MLCTxy, the hole is localized in an orbital perpendicular to the intermetallic axis and hence, significant intermetallic coupling is absent. This state shows no PIIVCT in the NIR and its spectrum is very similar to the one observed [Ru(tpy)(bpy)(CN)](+) reference. Both (MLCT)-M-3 excited states have nanosecond lifetimes. The intervening energy barrier for a hole reconfiguration between the two different (MLCT)-M-3 excited states offers the opportunity to exploit wave functions of different symmetry before either the interconversion between them or the decay to the ground state is operative.


FAU Authors / FAU Editors

Guldi, Dirk Michael Prof. Dr.
Lehrstuhl für Physikalische Chemie I


External institutions with authors

Universidad de Buenos Aires (UBA) / University of Buenos Aires


How to cite

APA:
Oviedo, P.S., Pieslinger, G.E., Baraldo, L.M., Cadranel, A., & Guldi, D.M. (2019). Coexistence of MLCT Excited States of Different Symmetry upon Photoexcitation of a Single Molecular Species. Journal of Physical Chemistry C, 123(6), 3285-3291. https://dx.doi.org/10.1021/acs.jpcc.8b09499

MLA:
Oviedo, Paola S., et al. "Coexistence of MLCT Excited States of Different Symmetry upon Photoexcitation of a Single Molecular Species." Journal of Physical Chemistry C 123.6 (2019): 3285-3291.

BibTeX: 

Last updated on 2019-06-03 at 15:08