Impact of van der Waals interactions on the structural and nonlinear optical properties of azobenzene switches

Literature Information

Publication Date 2021-08-23
DOI 10.1039/D1CP02500G
Impact Factor 3.676
Authors

Frédéric Castet


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Abstract

The geometrical structures, relative Z–E energies, and second-order nonlinear responses of a collection of azobenzene molecules symmetrically substituted in the meta-position with functional groups of different bulkiness are investigated using various ab initio and density functional approximations. We show that RI-MP2 and RI-CC2 approximations provide very similar geometries and relative energies and evidence that London dispersion interactions existing between bulky meta-substituents stabilize the Z conformer. The ωB97X-D exchange–correlation functional provides an accurate description of these effects and gives a good account of the nonlinear optical response of the molecules. We show that density functional approximations should include no less than 50% of Hartree–Fock exchange to provide accurate hyperpolarizabilities. A property–structure analysis of the azobenzene derivatives reveals that the main contribution to the first hyperpolarizability comes from the azo bond, but phenyl meso-substituents can enhance it.

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Physical Chemistry Chemical Physics
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