New [(D-terpyridine)-Ru-(D or A-terpyridine)][4-EtPhCO2]2 complexes (D = electron donor group; A = electron acceptor group) as active second-order non linear optical chromophores |
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Authors: | Colombo Alessia Locatelli Danika Roberto Dominique Tessore Francesca Ugo Renato Cavazzini Marco Quici Silvio De Angelis Filippo Fantacci Simona Ledoux-Rak Isabelle Tancrez Nicolas Zyss Joseph |
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Institution: | Dipartimento di Chimica Inorganica, Metallorganica e Analitica Lamberto Malatesta dell'Università degli Studi di Milano, UdR di Milano dell'INSTM, I-20133 Milano, Italy. |
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Abstract: | The dipolar and octupolar contributions of the second order nonlinear optical properties of (4'-(C(6)H(4)-p-D)-2,2':6',2'-terpyridine)-Ru-(4'-(C(6)H(4)-p-A)-2,2':6',2'-terpyridine)]Y(2) heteroleptic complexes (D and A are donor and acceptor groups, respectively), and related free terpyridines and homoleptic complexes, have been obtained by means of a comprehensive combination of Electric Field Induced Second Harmonic generation, Third Harmonic Generation, and Harmonic Light Scattering measurements. These results evidence how a metal can act as a bridge between two π-delocalized terpyridine moieties bearing a D and an A group, respectively, leading to a large quadratic hyperpolarizability hugely dominated by the octupolar contribution. |
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