Journal
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
Volume 15, Issue 10, Pages 5495-5507Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jctc.9b00574
Keywords
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Funding
- European Training Network Computational Spectroscopy In Natural sciences and Engineering (COSINE) [765739]
- Research Council of Norway [275506]
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The fully polarizable QM/MM approach based on fluctuating charges and fluctuating dipoles, named QM/FQF mu (J. Chem. Theory Comput. 2019, 15, 2233-2245), is extended to the evaluation of nuclear gradients and the calculation of IR spectra of molecular systems in condensed phase. To this end, analytical equations defining first and second energy derivatives with respect to nuclear coordinates are derived and discussed. The potentialities of the approach are shown by applying the model to the calculation of IR spectra of methlyoxirane, glycidol, and gallic acid in aqueous solution. The results are compared to the continuum QM/PCM and the polarizable QM/FQ, which is based on fluctuating charges only.
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