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Modelling absorption and emission of a meso-aniline-BODIPY based dye with molecular mechanics.
Physical Chemistry Chemical Physics : PCCP 2018 May 31
Absorption and emission spectra of 8-(4-dimethylaminophenyl)-1,3,5,7-tetramethyl-BODIPY have been calculated using Coupled Cluster (CC) approaches, Time-Dependent Density Functional Theory (TD-DFT) and a QM-informed MM approach. In the case of TD-DFT calculations solvent effects were included using the linear-response (LR), corrected linear response (cLR) and state specific (SS) Polarizable Continuum Model (PCM). We show that range-separated functionals give results in reasonable agreement with coupled cluster methods but both tend to overestimate excitation energies. Furthermore, we show that the SS-PCM approach is unable to provide a quantitative description of solvent effects in these systems, especially for the highly challenging charge-separated charge-transfer state. In contrast, the QM-informed MM approach gives results in good agreement with experiment and we propose a scheme which can be used to directly compare theoretically obtained spectra with experimental ones.
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