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Titolo:
Azulenylium and guaiazulenylium cations as novel accepting moieties in extended sesquifulvalene type D-pi-A NLO chromophores
Autore:
Farrell, T; Meyer-Friedrichsen, T; Malessa, M; Haase, D; Saak, W; Asselberghs, I; Wostyn, K; Clays, K; Persoons, A; Heck, J; Manning, AR;
Indirizzi:
Natl Univ Ireland Univ Coll Dublin, Dublin 4, Ireland Natl Univ Ireland Univ Coll Dublin Dublin Ireland 4 n, Dublin 4, Ireland Univ Hamburg, Inst Anorgan & Angew Chem, D-20146 Hamburg, Germany Univ Hamburg Hamburg Germany D-20146 ngew Chem, D-20146 Hamburg, Germany Univ Oldenburg, FB Chem, D-26111 Oldenburg, Germany Univ Oldenburg Oldenburg Germany D-26111 hem, D-26111 Oldenburg, Germany Katholieke Univ Leuven, Lab Chem & Biol Dynam, B-3001 Louvain, Belgium Katholieke Univ Leuven Louvain Belgium B-3001 m, B-3001 Louvain, Belgium
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 1, , anno: 2001,
pagine: 29 - 36
SICI:
1472-7773(2001):1<29:AAGCAN>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYPER-RAYLEIGH SCATTERING; NONLINEAR-OPTICAL PROPERTIES; FIRST HYPERPOLARIZABILITY MEASUREMENTS; HIGH-FREQUENCY DEMODULATION; MULTIPHOTON FLUORESCENCE; MOLECULES; COMPLEXES; DERIVATIVES; FERROCENE; DONOR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Farrell, T Natl Univ Ireland Univ Coll Dublin, Dublin 4, Ireland Natl UnivIreland Univ Coll Dublin Dublin Ireland 4 , Ireland
Citazione:
T. Farrell et al., "Azulenylium and guaiazulenylium cations as novel accepting moieties in extended sesquifulvalene type D-pi-A NLO chromophores", J CHEM S DA, (1), 2001, pp. 29-36

Abstract

The novel series of monometallic monocations Fc-[n]-Az(+) and Fc-[n]-Guaz() (where Az(+) and Guaz(+) denote azulenylium and guaiazulenylium cations respectively and n=0-3), and a bimetallic dicationic complex Fc-[0]-Guaz(RuCp)(2+) have been prepared. Single crystal structures of Fc-[0]-Guaz(+) andFc-[0]-Guaz(RuCp)(2+) have been determined. Analysis of the bond lengths and angles coupled with the electrochemistry data provides evidence for strong ground state charge transfer in the series which diminishes upon pi -bridge extension. The electronic absorption spectra reveal that alkylation of the cationic terminus (1) diminishes the electron-accepting ability, (2) results in a larger dipole moment change upon excitation and (3) causes a smaller sequential lowering of the CT transitions with pi -bridge extension. The NLO properties which were characterised by hyper-Rayleigh scattering techniques indicate the potential of the azulenylium based donor-acceptor chromophores, but also that the extended complexes exhibit two-photon absorption fluorescence.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/11/20 alle ore 11:23:03