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Formazanate boron difluoride dyes: discrepancies between TD-DFT and wavefunction descriptions.
Journal of Molecular Modeling 2016 November
In this work, we investigate the ground- and excited-state structures as well as the optical properties of a series of five formazanate dyes using state-of-the-art density-based and wavefunction-based methods. The present work is the first to evaluate the properties of formazanate-BF2 dyes with wavefunction-correlated schemes. Firstly, we show that CC2 provides more twisted ground-state geometries than DFT while both approaches lead to planar excited-state structures. Secondly, we demonstrate that the differences between the transition energies computed at TD-DFT, CIS(D), SOS-CIS(D), ADC(2), and CC2 levels are large and that the optical spectra also significantly depend on the selected geometries. Indeed, CC2 fluorescence energies computed on TD-DFT structures significantly differ from their full-CC2 counterparts. Thirdly, we discuss the importance of solvent effects evaluated with various continuum models. Fourthly, we provide comparisons with experiment.
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