Null Exciton Splitting in Chromophoric Greek Cross (+) Aggregate

Sebastian, Ebin ; Philip, Abbey M. ; Benny, Alfy ; Hariharan, Mahesh (2018) Null Exciton Splitting in Chromophoric Greek Cross (+) Aggregate Angewandte Chemie International Edition, 57 (48). pp. 15696-15701. ISSN 1433-7851

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Official URL: http://doi.org/10.1002/anie.201810209

Related URL: http://dx.doi.org/10.1002/anie.201810209

Abstract

Exciton interactions in molecular aggregates play a crucial role in tailoring the optical behavior of π-conjugated materials. Though vital for optoelectronic applications, ideal Greek cross-dipole (α = 90°) stacking of chromophores remains elusive. We report a novel Greek cross (+) assembly of 1,7-dibromoperylene-3,4,9,10-tetracarboxylic tetrabutylester (PTE-Br2) which exhibits null exciton coupling mediated monomer-like optical characteristics in crystalline state. Contrastingly, nonzero exciton coupling in X-type (α = 70.2°, PTE-Br0) and J-type (α = 0°, θ = 48.4°, PTE-Br4) assemblies render perturbed optical properties. Additionally, the semi-classical Marcus theory of charge-transfer rates predicts a selective hole transport phenomenon in the orthogonally stacked PTE-Br2. Precise rotation angle dependent optoelectronic properties in crystalline PTE-Br2 can have consequences in the rational design of novel π-conjugated materials for photonic and molecular electronic applications.

Item Type:Article
Source:Copyright of this article belongs to John Wiley & Sons, Inc.
ID Code:126994
Deposited On:17 Oct 2022 05:24
Last Modified:17 Oct 2022 05:24

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