Excitation wavelength dependent O2 release from copper(II)-superoxide compounds: Laser flash-photolysis experiments and theoretical studies

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Excitation wavelength dependent O2 release from copper(II)-superoxide compounds: Laser flash-photolysis experiments and theoretical studies - PC:672

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Autor segons l'article:	Karlin, K.D. Meyer, G.J. Neese, F. Zapata Rivera, J.E. Liakos, D.G. Saracini, C.
Any de publicació de la revista:	2014
ISSN:	0002-7863
DOI de l'article:	10.1021/ja4115314
Enllaç font original:	http://pubs.acs.org/doi/abs/10.1021/ja4115314
Versió de l'article dipositat:	info:eu-repo/semantics/submittedVersion
Accès a la llicència d'ús:	https://creativecommons.org/licenses/by/3.0/es/
Departament:	Química Física i Inorgànica
URL Document de llicència:	https://repositori.urv.cat/ca/proteccio-de-dades/
Entitat:	Universitat Rovira i Virgili.
Pàgina inicial:	1260
Pàgina final:	1263
Volum de revista:	136

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Títol:	Excitation wavelength dependent O2 release from copper(II)-superoxide compounds: Laser flash-photolysis experiments and theoretical studies
Descripció:	10.1021/ja4115314 Irradiation of the copper(II)-superoxide synthetic complexes [(TMG 3tren)CuII(O2)]+ (1) and [(PV-TMPA)CuII(O2)]+ (2) with visible light resulted in direct photogeneration of O2 gas at low temperature (from -40 C to -70 C for 1 and from -125 to -135 C for 2) in 2-methyltetrahydrofuran (MeTHF) solvent. The yield of O2 release was wavelength dependent: ?exc = 436 nm, = 0.29 (for 1), = 0.11 (for 2), and ?exc = 683 nm, = 0.035 (for 1), = 0.078 (for 2), which was followed by fast O2-recombination with [(TMG3tren)Cu I]+ (3) and [(PV-TMPA)CuI]+ (4). Enthalpic barriers for O2 rebinding to the copper(I) center (~10 kJ mol-1) and for O2 dissociation from the superoxide compound 1 (45 kJ mol-1) were determined. TD-DFT studies, carried out for 1, support the experimental results confirming the dissociative character of the excited states formed upon blue- or red-light laser excitation.
Cobertura:	Anglès
Tipus:	Pre-print info:eu-repo/semantics/submittedVersion
Coautor:	Química Física i Inorgànica Universitat Rovira i Virgili.
Matèria:	Copper compounds 0002-7863
Idioma:	en
Autor:	Karlin, K.D. Meyer, G.J. Neese, F. Zapata Rivera, J.E. Liakos, D.G. Saracini, C.
Drets:	info:eu-repo/semantics/openAccess
Data:	2014