Influence of the molecular configuration on second-order nonlinear optical properties of coordination compounds

Several unsymmetrically substituted aromatic donor-acceptor disulfides have been synthesized and analysed for their second order nonlinear optical properties These molecules exhibit moderately high first hyperpolarizability (β) with excellent transparency in the visible region Most of the unsymmetrical disulfides have a cut-off wavelength below 420 nm Calculations show that the molecules have an asymmetric charge distribution around the disulfide bond which is responsible for their high β values These results provide motivation for the design and synthesis of nonlinear optical chromophores with multiple disulfide bonds for large second order nonlinearity and excellent visible transparency

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Unsymmetrical aryl disulfides with excellent transparency in the visible region for second order nonlinear optics

Formation of an Unexpected Organometallic Mercury Compound in a Palladium-Catalyzed Reaction

Two-level hyperpolarisabilities,β2 of a series of amine substituted dicyanoquinodimethane molecules were investigated utilising a simple solvatochromic method developed by us for the determination of excited state dipole moments. The hyperpolarisability,β as well as the two-level approximation to it,β2, of these quinonoid systems were estimated computationally. Using a parallel study on a set of well known coumarin dyes and their reported electric field induced second harmonic generation (EFISHG)β for calibration, the experimental staticβ’s of quinonoid molecules are estimated and found to the very large, approximately in the range of −50 to −60×10−30 e.s.u.

Xiangdong Wu

Papers

Determination of the first molecular hyperpolarizability, β, of some organomercury compounds by solvatochromism☆