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Titolo:
INTRAMOLECULAR CHARGE-TRANSFER AND ENHANCED QUADRATIC OPTICAL NONLINEARITIES IN PUSH-PULL POLYENES
Autore:
BLANCHARDDESCE M; ALAIN V; MIDRIER L; WORTMANN R; LEBUS S; GLANIA C; KRAMER P; FORT A; MULLER J; BARZOUKAS M;
Indirizzi:
ECOLE NORMALE SUPER,DEPT CHIM,URA 1679 CNRS,24 RUE LHOMOND F-75231 PARIS 05 FRANCE UNIV MAINZ,INST PHYS CHEM D-55099 MAINZ GERMANY INST PHYS & CHIM MAT STRASBOURG,OPT NONLINEAIRE & OPTOELECT GRP,UMR 046 CNRS F-67037 STRASBOURG FRANCE
Titolo Testata:
Journal of photochemistry and photobiology. A, Chemistry
fascicolo: 2-3, volume: 105, anno: 1997,
pagine: 115 - 121
SICI:
1010-6030(1997)105:2-3<115:ICAEQO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
DONOR-ACCEPTOR POLYENES; ORGANIC-MOLECULES; 2ND-ORDER POLARIZABILITY; ELECTRONIC-STRUCTURE; CONJUGATION LENGTH; EXCITED-STATE; END-GROUPS; HYPERPOLARIZABILITIES; NONLINEARITIES; DERIVATIVES;
Keywords:
ELECTRIC-FIELD-INDUCED 2ND-HARMONIC GENERATION (EFISH); ELECTROOPTICAL ABSORPTION MEASUREMENTS (EOAM); EXCITED STATE DIPOLES; HYPERPOLARIZABILITIES; INTRAMOLECULAR CHARGE TRANSFER; NONLINEAR OPTICS; PUSH-PULL POLYENES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
37
Recensione:
Indirizzi per estratti:
Citazione:
M. Blancharddesce et al., "INTRAMOLECULAR CHARGE-TRANSFER AND ENHANCED QUADRATIC OPTICAL NONLINEARITIES IN PUSH-PULL POLYENES", Journal of photochemistry and photobiology. A, Chemistry, 105(2-3), 1997, pp. 115-121

Abstract

Push-pull polyenes, which have an electron-donating group (D) and an electron-withdrawing group (A) grafted on opposite ends of a conjugated polyenic chain, are of particular interest as model compounds for long-distance intramolecular charge transfer (ICT), as well as potent non-linear optical chromophores. Several series of push-pull polyenes ofincreasing length, combining aromatic donor moieties and various acceptor groups, have been prepared and studied. Their linear and non-linear optical properties have been investigated by performing electro-optical absorption measurements (EOAM) and electric-field-induced second-harmonic generation (EFISH) experiments in solution. Each molecule shows a broad and intense ICT absorption band in the visible associated with an increase in the dipole moment (Delta mu). Lengthening the polyenic chain linking the D and A groups results in a bathochromic shift of the ICT absorption band and induces a linear increase in the excitedstate dipole. In contrast, the ground state dipole remains roughly constant. As a result, the longest molecules exhibit huge Delta mu. values (up to 42 D) as well as markedly enhanced quadratic hyperpolarizabilities (beta). In addition, the nature of the end groups has been found to influence strongly both the ICT and optical non-linearities: larger beta and Delta mu values, as well as steeper length dependences, are obtained with push-pull phenylpolyenes bearing strong accepters, (C)1997 Elsevier Science S.A.

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Documento generato il 05/04/20 alle ore 04:11:30