The second-order nonlinear optical (NLO) properties of a push–pull monomer, as well as of its dimer composed of two monomeric units connected through a non-conjugated spiro junction, are investigated by means of hyper-Rayleigh scattering (HRS) and quantum chemical calculations. It is shown that dimerization to form a molecule with an orthogonal geometry enhances the first hyperpolarizability by circa 20 % and induces a decrease of the dipolar character of the HRS response. Theoretical calculations correlate well with experimental measurements and allow an in-depth rationalization of the impact of the spiro linkage on the NLO properties through a detailed analysis of the relevant electronic excited states.
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Castet, F., Lerychard, T., Pielak, K., Szalóki, G., Dalinot, C., Leriche, P., Sanguinet, L., Champagne, B., & Rodriguez, V. (2017). How Dimerization Through a Spiro Junction Modifies the Nonlinear Optical Properties of a Push–Pull Organic Dye: Insights from Theory and Hyper-Rayleigh Scattering. ChemPhotoChem, 1(3), 93-101. https://doi.org/10.1002/cptc.201600039