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Abstract:

We report an efficient triplet state self-quenching mechanism in crystals of eight benzophenones, which included the parent structure (1), six 4,4′-disubstituted compounds with NH 2 (2), NMe 2 (3), OH (4), OMe (5), COOH (6), and COOMe (7), and benzophenone-3,3′,4, 4′-tetracarboxylic dianhydride (8). Self-quenching effects were determined by measuring their triplet-triplet lifetimes and spectra using femtosecond and nanosecond transient absorption measurements with nanocrystalline suspensions. When possible, triplet lifetimes were confirmed by measuring the phosphorescence lifetimes and with the help of diffusion-limited quenching with iodide ions. We were surprised to discover that the triplet lifetimes of substituted benzophenones in crystals vary over 9 orders of magnitude from ca. 62 ps to 1 ms. In contrast to nanocrystalline suspensions, the lifetimes in solution only vary over 3 orders of magnitude (1-1000 μs). Analysis of the rate constants of quenching show that the more electron-rich benzophenones are the most efficiently deactivated such that there is an excellent correlation, ρ = -2.85, between the triplet quenching rate constants and the Hammet θ + values for the 4,4′ substituents. Several crystal structures indicate the existence of near-neighbor arrangements that deviate from the proposed ideal for "n-type" quenching, suggesting that charge transfer quenching is mediated by a relatively loose arrangement. © 2011 American Chemical Society.

Registro:

Documento: Artículo
Título:Excited state kinetics in crystalline solids: Self-quenching in nanocrystals of 4,4′-disubstituted benzophenone triplets occurs by a reductive quenching mechanism
Autor:Kuzmanich, G.; Simoncelli, S.; Gard, M.N.; Spänig, F.; Henderson, B.L.; Guldi, D.M.; Garcia-Garibay, M.A.
Filiación:Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90024-1569, United States
Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, Pabellón 2, 1428 Buenos Aires, Argentina
Department of Chemistry and Pharmacy, Interdisciplinary Center of Molecular Materials (ICMM), Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 3, 91054 Erlangen, Germany
Palabras clave:Crystalline solids; Diffusion limited; Disubstituted compounds; Electron-rich; Excited state kinetics; Femtoseconds; Iodide ion; Nanocrystallines; Nanosecond transient absorption; Orders of magnitude; Parent structure; Phosphorescence lifetime; Quenching mechanisms; Self-quenching; Self-quenching effect; Triplet quenching; Triplet state; Charge transfer; Crystal structure; Crystals; Excited states; Ion exchange; Polypropylenes; Rate constants; Quenching; 4,4' bis(dimethylamino)benzophenone; 4,4' diaminobenzophenone; 4,4' dihydroxybenzophenone; benzophenone derivative; iodide; nanocrystal; unclassified drug; article; chemical reaction kinetics; chemical structure; crystal structure; molecular dynamics; phosphorescence; purification; self quenching; synthesis; Benzophenones; Kinetics; Nanoparticles; Oxidation-Reduction; Particle Size; Surface Properties
Año:2011
Volumen:133
Número:43
Página de inicio:17296
Página de fin:17306
DOI: http://dx.doi.org/10.1021/ja204927s
Título revista:Journal of the American Chemical Society
Título revista abreviado:J. Am. Chem. Soc.
ISSN:00027863
CODEN:JACSA
CAS:4,4' bis(dimethylamino)benzophenone, 90-94-8; iodide, 20461-54-5; Benzophenones
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027863_v133_n43_p17296_Kuzmanich

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Citas:

---------- APA ----------
Kuzmanich, G., Simoncelli, S., Gard, M.N., Spänig, F., Henderson, B.L., Guldi, D.M. & Garcia-Garibay, M.A. (2011) . Excited state kinetics in crystalline solids: Self-quenching in nanocrystals of 4,4′-disubstituted benzophenone triplets occurs by a reductive quenching mechanism. Journal of the American Chemical Society, 133(43), 17296-17306.
http://dx.doi.org/10.1021/ja204927s
---------- CHICAGO ----------
Kuzmanich, G., Simoncelli, S., Gard, M.N., Spänig, F., Henderson, B.L., Guldi, D.M., et al. "Excited state kinetics in crystalline solids: Self-quenching in nanocrystals of 4,4′-disubstituted benzophenone triplets occurs by a reductive quenching mechanism" . Journal of the American Chemical Society 133, no. 43 (2011) : 17296-17306.
http://dx.doi.org/10.1021/ja204927s
---------- MLA ----------
Kuzmanich, G., Simoncelli, S., Gard, M.N., Spänig, F., Henderson, B.L., Guldi, D.M., et al. "Excited state kinetics in crystalline solids: Self-quenching in nanocrystals of 4,4′-disubstituted benzophenone triplets occurs by a reductive quenching mechanism" . Journal of the American Chemical Society, vol. 133, no. 43, 2011, pp. 17296-17306.
http://dx.doi.org/10.1021/ja204927s
---------- VANCOUVER ----------
Kuzmanich, G., Simoncelli, S., Gard, M.N., Spänig, F., Henderson, B.L., Guldi, D.M., et al. Excited state kinetics in crystalline solids: Self-quenching in nanocrystals of 4,4′-disubstituted benzophenone triplets occurs by a reductive quenching mechanism. J. Am. Chem. Soc. 2011;133(43):17296-17306.
http://dx.doi.org/10.1021/ja204927s