Photoresponsive molecular switches enable spatial and temporal control of molecular processes and are therefore crucial for the development of smart functional materials. Because the light-induced dynamics of these switching units are at the core of the resulting functionality, a detailed insight into their structural time evolution is fundamental for molecular embedding. Here, we performed a hybrid quantum mechanics (CASPT2 and TDDFT)/molecular mechanics (QM/MM) study to elucidate the photodynamics of an azodicarboxamide-based molecular switch, which is a promising candidate for implementation in highly dense environments such as polymers. In particular, we report a detailed picture of the molecular motion at the atomic level based on a relevant number of excited-state trajectories. We show that the azodicarboxamide-based molecular switch undergoes both a forward and backward pedalo-type motion upon excitation. Trans-cis photoisomerization on the other hand, which is well-known to occur for other azo-based chromophores, is shown to be a negligible pathway. By validating the volume-conserving pedalo-type motion, we provide a rational basis for the design of novel types of photoresponsive functional materials in which the active component must operate in a confined space.

Conti I., Buma W.J., Garavelli M., Amirjalayer S. (2020). Photoinduced Forward and Backward Pedalo-Type Motion of a Molecular Switch. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 11(12), 4741-4746 [10.1021/acs.jpclett.0c01094].

Photoinduced Forward and Backward Pedalo-Type Motion of a Molecular Switch

Conti I.;Garavelli M.;
2020

Abstract

Photoresponsive molecular switches enable spatial and temporal control of molecular processes and are therefore crucial for the development of smart functional materials. Because the light-induced dynamics of these switching units are at the core of the resulting functionality, a detailed insight into their structural time evolution is fundamental for molecular embedding. Here, we performed a hybrid quantum mechanics (CASPT2 and TDDFT)/molecular mechanics (QM/MM) study to elucidate the photodynamics of an azodicarboxamide-based molecular switch, which is a promising candidate for implementation in highly dense environments such as polymers. In particular, we report a detailed picture of the molecular motion at the atomic level based on a relevant number of excited-state trajectories. We show that the azodicarboxamide-based molecular switch undergoes both a forward and backward pedalo-type motion upon excitation. Trans-cis photoisomerization on the other hand, which is well-known to occur for other azo-based chromophores, is shown to be a negligible pathway. By validating the volume-conserving pedalo-type motion, we provide a rational basis for the design of novel types of photoresponsive functional materials in which the active component must operate in a confined space.
2020
Conti I., Buma W.J., Garavelli M., Amirjalayer S. (2020). Photoinduced Forward and Backward Pedalo-Type Motion of a Molecular Switch. THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 11(12), 4741-4746 [10.1021/acs.jpclett.0c01094].
Conti I.; Buma W.J.; Garavelli M.; Amirjalayer S.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/785762
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