Effects of solvent, excitation wavelength, and concentration on the photobehavior of some diazonaphthoquinones

Autor: Marco Cipolloni, Pier L. Gentili, Fausto Ortica, Ralph S. Becker, and Gianna Favaro

Publikováno v: ARKIVOC, Vol 2011, Iss 9, Pp 205-220 (2011)

Externí odkaz: https://doaj.org/article/0e3dd76195e24f83a5e89f80c058d9a5

Vibronic effects in pathways of photochemistry and vibrational relaxation

Autor: Pier Luigi Gentili, Giovanna Favaro, Aldo Romani, Ralph S. Becker, Fernando B. Dias

Publikováno v: Chemical Physics. 316:108-116

A photochemical and photophysical investigation has been carried out on 2,2-dimethyl-7,8-benzo-2H-chromene and 2,2-dimethyl-5,6-benzo-2H-chromene. Absolute quantum yields of fluorescence [ΦF(n)] and photochemistry [ΦPC(n)] have been determined and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e15b95be875e2de7b72168efd035f0d5
https://doi.org/10.1016/j.chemphys.2005.05.008

Photochemistry of Flavothione and Hydroxyflavothiones: Mechanisms and Kinetics¶

Autor: Emilia Leitao, A.A. Dias, Gian Gaetano Aloisi, Fausto Elisei, Vasco D. B. Bonifácio, Ralph S. Becker, Fausto Ortica, António L. Maçanita, Maria João Caldeira, Christopher D. Maycock

Publikováno v: Photochemistry and Photobiology. 77:22-29

In this work we present a detailed study of the mechanism of photochemistry and thermal reactions, as well as of the kinetics of flavothione (FLT) in ethanol. Furthermore, we analyzed how the hydroxysubstitution pattern of FLT influenced both the kin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e8af6139b71f4335127adb606188e90
https://doi.org/10.1562/0031-8655(2003)0770022pofahm2.0.co2

Comprehensive Investigation of the Photophysical Behavior of Oligopolyfurans

Autor: Ralph S. Becker, Gian Gaetano Aloisi, Fausto Elisei, Carlos A. Gartner, J. Sérgio Seixas de Melo

Publikováno v: Scopus-Elsevier
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
CIÊNCIAVITAE

The photophysical properties of (oligo)polyfurans (Fn, where n ) 1-5 represents the number of rings) are presented for the first time for 2-4 rings and compared to parallel data for the corresponding (oligo)polythiophenes (Tn). The quantum yields of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e22ae1f1bd25502fa9a4d42d8f61257
https://doi.org/10.1021/jp994177v

Singlet and triplet energies of α-oligothiophenes: A spectroscopic, theoretical, and photoacoustic study: Extrapolation to polythiophene

Autor: J. Sérgio Seixas de Melo, Luis G. Arnaut, Luı́s M. Silva, Ralph S. Becker

Publikováno v: The Journal of Chemical Physics. 111:5427-5433

The triplet state energies, ET(0–0), for the α-oligothiophenes (αn’s) with n=1–7, were determined and vary from 18 000 cm−1 (α2) to 13 000 cm−1 (α7). The data were obtained from spectroscopic and calorimetric measurements. It was found

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::880a7a70e2e5f04087c2aa5e0e49beef
https://doi.org/10.1063/1.479825