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Diboron- and Diaza-Doped Anthracenes and Phenanthrenes: Their Electronic Structures for Being Singlet Fission Chromophores

preprint
submitted on 28.07.2020 and posted on 29.07.2020 by Ekadashi Pradhan, Tao Zeng

We used quantum chemistry methods at the levels of mixed-reference spin-flipping time-dependent density functional theory and multireference perturbation theory to study diboron- and diaza-doped anthracenes and phenanthrenes. This class of structures recently surged as potential singlet fission chromophores. We studied electronic structures of their excited states and clarify the reasons why they satisfy or fail to satisfy the energy criteria for singlet fission chromophores. Many studied structures have their S1 states not dominated by HOMO->LUMO excitation, so that they cannot be described using the conventional two sites model. This is attributed to frontier orbital energy shifts induced by the doping and different charge transfer energies in different one-electron singlet excitations, or in other words different polarizations of hole and/or particle orbitals in their S1 and T1 states. There is a mirror relation between the orbital energy shifts induced by diboron- and diaza-dopings, which, together with alternant hydrocarbon pairings of occupied and unoccupied orbitals, leads to more mirror relations between the excited states' electronic structures of the two types of doped structures.

Funding

the Natural Sciences and Engineering Research Council (RGPIN-2016-06276)

York University (481333)

History

Email Address of Submitting Author

tzeng@yorku.ca

Institution

York University

Country

Canada

ORCID For Submitting Author

0000-0002-1553-7850

Declaration of Conflict of Interest

We declare no conflict of interest

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