Abstract

The dynamic first hyperpolarizabilities of a series of 1,10-phenanthroline Ru(II) complexes were carried out using density functional theory (DFT). The results indicate that these complexes have large second-order nonlinear optical (NLO) responses. Specially, complex 6b has a maximal first hyperpolarizability βtot value. The first hyperpolarizabilities can be tuned by changing the ancillary ligand, introducing electron-acceptor group NO2 and/or increasing π-conjugation on phenanthroline. Calculations on absorption spectra demonstrate that the second-order NLO responses of complexes in series a are ascribed to the intraligand charge transfer (ILCT), while the complexes in series b exhibit metal-to-ligand charge transfer (MLCT) and ligand-to-ligand charge transfer (LLCT) transition at relatively low-energy absorptions.

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