Dipartimento di Chimica Inorganica, Metallorganica e Analitica Lamberto Malatesta dell'Università degli Studi di Milano, UdR di Milano dell'INSTM, I-20133 Milano, Italy.
Dalton Trans. 2012 Jun 14;41(22):6707-14. doi: 10.1039/c2dt30183k. Epub 2012 Apr 17.
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.
[(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) 杂配配合物（D 和 A 分别为供体和受体基团）二阶非线性光学性质的偶极和八极贡献，以及相关的游离三吡啶和同核配合物，通过电场感应二次谐波产生、三次谐波产生和谐波光散射测量的综合组合得到了获得。这些结果表明，金属如何在分别带有 D 和 A 基团的两个π离域三吡啶部分之间充当桥梁，从而导致主要由八极贡献主导的大二次超极化率。
