Enhancing accuracy in predicting optical properties of explicitly solvated systems: a comprehensive approach through long-range separated tuning of RSH functional and sequential QM/MM
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2023-07-31
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Universidade Federal de Goiás
Resumo
The properties of molecular systems are generally measured experimentally in solution.
In a theoretical context, molecular modeling is done in vacuum, leading to discrepancies
when comparing theoretical results with the experimental ones. In light of this, the use
of solvation methods become necessary. However, existing methodologies do not allow
optimizing the separation parameter of electronic interactions in RSH functionals ω. An
approach to combine functional optimization of the functionals with explicitly solvated organic systems, such as para-Nitroaniline and Phenol Blue, was developed by this work.
The explicit solvation was performed using the S-QM/MM methodology with ASEC-FEG
approximations. The optimization process was performed using the JGAP scheme with a
Golden Ratio-based search algorithm to minimize the number of calculations. RSH functionals are noteworthy for improving the description of photoelectronic properties, hence
we decided to study such properties. Firstly, electronic excitation and non-linear optical
properties calculations were performed for para-nitroaniline to verify the change in photophysical properties with functional optimization. The properties were evaluated as well for
Phenol Blue systems, which has well-elucidated optoelectronic properties, to validate the
methodology. Finally, the results showed that the proposed methodology is successful in
explicit solvation. Photophysical properties were improved by circa 20%, in high polar systems, for para-Nitroaniline and Phenol Blue. NLO Properties for Phenol Blue have an good
agreement for first-hyperpolarizability in non-polar and protic-polar systems, and secondhyperpolarizability have the best results in protic-polar systems.
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MATIAS, P. H. F. Enhancing accuracy in predicting optical properties of explicitly solvated systems: a comprehensive approach through long-range separated tuning of RSH functional and sequential QM/MM. 2023. 90 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2023.