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How Dispersion Interactions at the Excited State Can Tune Photochromism of Embedded Chromophores
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We present QM/MMPol-cLR3, a polarizable embedding quantum mechanics/molecular mechanics (QM/MM) framework that includes explicit, state-specific dispersion terms. This method enables a rigorous treatment of dispersion on top of electrostatic and induction effects in ground- and excited-state calculations. Using QM/MMPol-cLR3, we show that dispersion interactions control excited-state solvatochromism through two distinct mechanisms. In azulene, opposite shifts of the La and Lb states arise from state-specific dispersion linked to changes in excited-state polarizability. In bacteriochlorophyll a, dispersion instead stems from the interplay between polarizability changes and transition-dipole-driven response, governing the Qy and Qx shifts. Finally, application to the LH2 complex reveals pigment-dependent dispersion shifts between the B800 and B850 rings, impacting the excitation-energy transfer. These results establish dispersion as an essential, nonempirical component for predictive excited-state simulations in complex environments.
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GUIDO, Ciro a., CUPELLINI, Lorenzo, MENNUCCI, Benedetta, CURUTCHET BARAT, Carles e.. How Dispersion Interactions at the Excited State Can Tune Photochromism of Embedded Chromophores. _Journal of the American Chemical Society_. 2026. Vol. 148, núm. 1, pàgs. 1847-1857. [consulta: 25 de gener de 2026]. ISSN: 0002-7863. [Disponible a: https://hdl.handle.net/2445/225923]