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Titolo:
Effects of diamine bridge length and substituents on the spectral properties of N,N '-bis(alpha-substituted salicylidene)diamines in solution
Autore:
Kawasaki, T; Kamata, T; Ushijima, H; Kanakubo, M; Murata, S; Mizukami, F; Fujii, Y; Usui, Y;
Indirizzi:
Natl Inst Mat & Chem Res, Ibaraki, Osaka 3058565, Japan Natl Inst Mat & Chem Res Ibaraki Osaka Japan 3058565 Osaka 3058565, Japan Ibaraki Univ, Grad Sch Sci & Engn, Ibaraki, Osaka 3108512, Japan Ibaraki Univ Ibaraki Osaka Japan 3108512 n, Ibaraki, Osaka 3108512, Japan
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 2, , anno: 1999,
pagine: 193 - 198
SICI:
0300-9580(199902):2<193:EODBLA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROTON-TRANSFER; SCHIFF-BASES; STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Mizukami, F Natl Inst Mat & Chem Res, 1-1 Higashi, Ibaraki, Osaka 3058565,Japan Natl Inst Mat & Chem Res 1-1 Higashi Ibaraki Osaka Japan 3058565
Citazione:
T. Kawasaki et al., "Effects of diamine bridge length and substituents on the spectral properties of N,N '-bis(alpha-substituted salicylidene)diamines in solution", J CHEM S P2, (2), 1999, pp. 193-198

Abstract

Absorption and fluorescence spectra of thirteen N,N'-bis(alpha-substitutedsalicylidene)diamines in solution were investigated with the intention of investigating the role of the substituent and diamine bridge length on their optical properties. The fluorescence efficiency was improved by an increase in the electron-donating property of the substituents on the azomethine carbon accompanied by an increase of the n-->pi* transition;absorption. However, the effect did not occur for the substituents on the azomethine nitrogen, in which no drastic changes in fluorescence efficiency could be observed. Through the investigation of the diamine bridge length effects, it was found that a diamine Schiff base seems to form neither an inter- nor an intramolecular dimer with any peculiar fluorescence in the solution even if ithas a long methylene bridge. It was also suggested that the diamine Schiffbase has a third fluorescence species in the excited state, which might bea pre-keto form, the existence of which is strongly affected by the hydrogen bond strength between the hydroxy and azomethine groups.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 00:20:56