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Cadranel, A.; Oviedo, P.S.; Pieslinger, G.E.; Yamazaki, S.; Kleiman, V.D.; Baraldo, L.M.; Guldi, D.M. "Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes" (2017) Chemical Science. 8(11):7434-7442
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Abstract:

The picosecond excited state dynamics of [Ru(tpm)(bpy)(NCS)]+ (RubNCS+) and [Ru(tpm)(bpy)(CN)]+ (RubCN+) (tpm = tris(1-pyrazolyl)methane, bpy = 2,2′-bipyridine) have been analyzed by means of transient absorption measurements and spectroelectrochemistry. Emissive 3MLCTs with (GS)HOMO(h+)-(GS)LUMO(e-) configurations are the lowest triplet excited states regardless of whether 387 or 505 nm photoexcitation is used. 387 nm photoexcitation yields, after a few picoseconds, the emissive 3MLCTs. In contrast, 505 nm photoexcitation populates an intermediate excited state that we assign as a 3MLCT state, in which the hole sits in a metal-centered orbital of different symmetry, prior to its conversion to the emissive 3MLCTs. The disparities in terms of electronic configuration between the intermediate and the emissive 3MLCTs have two important consequences. On one hand, both states feature very different fingerprint absorptions in transient absorption measurements. On the other hand, the reconfiguration is impeded by a kinetic barrier. As such, the conversion is followed spectroscopically and kinetically on the 300 ps timescale. © 2017 The Royal Society of Chemistry.

Registro:

Documento: Artículo
Título:Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes
Autor:Cadranel, A.; Oviedo, P.S.; Pieslinger, G.E.; Yamazaki, S.; Kleiman, V.D.; Baraldo, L.M.; Guldi, D.M.
Filiación:Department of Chemistry and Pharmacy, Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, Erlangen, 91058, Germany
Departamento de Química Analítica, Inorgánica y Química Física, INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, Buenos Aires, C1428EHA, Argentina
Department of Chemistry, University of Florida, PO BOX 117200, Gainesville, FL 32611-7200, United States
Palabras clave:Photoexcitation; Spectroelectrochemistry; Bipyridines; Electronic configuration; Excited-state dynamics; Kinetic barrier; Picoseconds; Ru(bpy); Time-scales; Transient absorption measurements; Excited states
Año:2017
Volumen:8
Número:11
Página de inicio:7434
Página de fin:7442
DOI: http://dx.doi.org/10.1039/c7sc02670f
Título revista:Chemical Science
Título revista abreviado:Chem. Sci.
ISSN:20416520
CODEN:CSHCC
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20416520_v8_n11_p7434_Cadranel

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Citas:

---------- APA ----------
Cadranel, A., Oviedo, P.S., Pieslinger, G.E., Yamazaki, S., Kleiman, V.D., Baraldo, L.M. & Guldi, D.M. (2017) . Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes. Chemical Science, 8(11), 7434-7442.
http://dx.doi.org/10.1039/c7sc02670f
---------- CHICAGO ----------
Cadranel, A., Oviedo, P.S., Pieslinger, G.E., Yamazaki, S., Kleiman, V.D., Baraldo, L.M., et al. "Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes" . Chemical Science 8, no. 11 (2017) : 7434-7442.
http://dx.doi.org/10.1039/c7sc02670f
---------- MLA ----------
Cadranel, A., Oviedo, P.S., Pieslinger, G.E., Yamazaki, S., Kleiman, V.D., Baraldo, L.M., et al. "Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes" . Chemical Science, vol. 8, no. 11, 2017, pp. 7434-7442.
http://dx.doi.org/10.1039/c7sc02670f
---------- VANCOUVER ----------
Cadranel, A., Oviedo, P.S., Pieslinger, G.E., Yamazaki, S., Kleiman, V.D., Baraldo, L.M., et al. Trapping intermediate MLCT states in low-symmetry {Ru(bpy)} complexes. Chem. Sci. 2017;8(11):7434-7442.
http://dx.doi.org/10.1039/c7sc02670f