Intermolecular Packing Effects on Singlet Fission in Oligorylene Dimers

ACS Omega
Takanori NagamiMasayoshi Nakano

Abstract

Using the density functional theory method, the crystalline packing effect on the singlet fission (SF) rate of oligorylenes, some of which are found to exhibit SF in crystal forms, is revealed by evaluating the effective electronic coupling (|Veff|), the square of which is proportional to the SF rate. The |Veff| values for terrylene and quaterrylene dimer models are investigated for a variety of slip-stacked forms. It is found that these values show similar dependences on the intermolecular packing as a function of lateral and longitudinal displacements of monomer frameworks, and that they are maximized in several configurations of one monomer slipped from another along the longitudinal axis. The present estimation method of the SF rate is also found to qualitatively explain the experimental SF rate difference between terrylene derivatives with different packing forms. Furthermore, by analyzing the effect of electronic couplings on the adiabatic electronic states related to SF, we predict several favorable molecular packings leading to a fast SF with a high triplet yield.

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Aug 10, 2018·Chemical Science·Ryan D PensackGregory D Scholes
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Aug 14, 2020·The Journal of Physical Chemistry. a·Takanori NagamiMasayoshi Nakano
May 8, 2019·Journal of the American Chemical Society·Nicolò AlagnaMarcus Motzkus

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