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Titolo:
Cationic pi-electron systems with high quadratic hyperpolarisability
Autore:
Lambert, C; Gaschler, W; Noll, G; Weber, M; Schmalzlin, E; Brauchle, C; Meerholz, K;
Indirizzi:
Univ Wurzburg, Inst Organ Chem, D-97074 Wurzburg, Germany Univ Wurzburg Wurzburg Germany D-97074 n Chem, D-97074 Wurzburg, Germany Univ Regensburg, Inst Organ Chem, D-93040 Regensburg, Germany Univ Regensburg Regensburg Germany D-93040 , D-93040 Regensburg, Germany Univ Munich, Inst Phys Chem, D-81377 Munich, Germany Univ Munich Munich Germany D-81377 st Phys Chem, D-81377 Munich, Germany
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
fascicolo: 6, , anno: 2001,
pagine: 964 - 974
SICI:
1472-779X(2001):6<964:CPSWHQ>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYPER-RAYLEIGH SCATTERING; NONLINEAR-OPTICAL-PROPERTIES; BOND-LENGTH ALTERNATION; FIRST HYPERPOLARIZABILITIES; MOLECULAR HYPERPOLARIZABILITY; 2ND-ORDER POLARIZABILITY; OCTUPOLAR MOLECULES; SOLVENT DEPENDENCE; THREEFOLD SYMMETRY; PARA-NITROANILINE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
82
Recensione:
Indirizzi per estratti:
Indirizzo: Lambert, C Univ Wurzburg, Inst Organ Chem, D-97074 Wurzburg, Germany Univ Wurzburg Wurzburg Germany D-97074 7074 Wurzburg, Germany
Citazione:
C. Lambert et al., "Cationic pi-electron systems with high quadratic hyperpolarisability", J CHEM S P2, (6), 2001, pp. 964-974

Abstract

Cationic NLO-chromophores based on tolane pi -systems in which conventional electron donors are combined with ionic pyridinio or triorganoammonio and-phosphonio substituents, respectively, perform much better than conventional donor/acceptor-substituted (D/A-substituted) tolanes concerning their hyperpolarisability-transparency trade-off. This effect occurs because ionicacceptors do not enlarge the pi -system in contrast to conventional acceptors. The same holds true for benzene-type chromophores. Despite their different electronic nature, the extrapolated maximal high-energy absorption of the ionic chromophore series as well as of the conventional donor/acceptor-tolanes coincide at the absorption energy of unsubstituted tolane. This proves that the maximal blue transparency of a given series of substituted chromophores is governed by the absorption maximum of the unsubstituted parentchromophore. In this way chromophores have been designed with much higher quadratic hyperpolarisability than e.g. p-nitroaniline at about the same absorption wavelength. By applying the same concept, a two- and a three-dimensional highly efficient octupolar NLO-chromophore assembly has also been synthesised.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 00:29:00