Fotoqu?mica de compostos Di- e Tricarbonilados Vicinais C?clicos em presen?a de Olefinas
| Autor: | Silva, Monica Teixeira da |
|---|---|
| Přispěvatelé: | Ferreira, Jos? Carlos Netto, Fraiz Junior, Silas Varella, Silva, Francisco de Assis da, Nicodem, David Ernest, Gohlen, Marcelo |
| Jazyk: | portugalština |
| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Biblioteca Digital de Teses e Dissertações da UFRRJ Universidade Federal Rural do Rio de Janeiro (UFRRJ) instacron:UFRRJ |
| Popis: | Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2020-12-03T12:14:33Z No. of bitstreams: 1 1999 - Monica Teixeira da Silva.pdf: 6771856 bytes, checksum: 1b4c1e7e9d241d844108cf5b263c0ca7 (MD5) Made available in DSpace on 2020-12-03T12:14:33Z (GMT). No. of bitstreams: 1 1999 - Monica Teixeira da Silva.pdf: 6771856 bytes, checksum: 1b4c1e7e9d241d844108cf5b263c0ca7 (MD5) Previous issue date: 1999-07-30 Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES Spectroscopic, kinetic and product studies were performed with several cyciic vicinal di- and tricarbonyl compounds, such as acenaphthenequinone (6), aceanthrenequinone (35), 1,2,3-indanetrione (18), 5-methoxy-1,2,3- indanetrione (22), 1H- benz[f]indene-1,2,3-trione (23), alioxan (14) anal dehydroascorbic acid (36), in the presence of olefins. The quenching of 6, 35, 18, 22 and 23 tripiets by olefins in, degassed benzene solution has been measured by laser flash photolysis. The alkenes studied inciuded cyclic, acyclic, isolated and conjugated dienes, and enol ethers. For 6 the quenching rate constant (kq) ranges from 2.1 x 106 M-1s-1 (for 1,5-hexadiene) to 6.0 x 108 M-1 S-1 (for L,3-dimethyl-2-butenel. A plot of log kq versus the ionization potential of the olefin is linear (r = 0.98) with a slope of -2,1/eV. On the other hand, the quenching rate constant for the tripiet of 35 by olefins is extremely low ( |
| Databáze: | OpenAIRE |
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