Null Exciton Splitting in Chromophoric Greek Cross (+) Aggregate
Ebin Sebastian
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
These authors contributed equally to this work.
Search for more papers by this authorAbbey M. Philip
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
These authors contributed equally to this work.
Search for more papers by this authorAlfy Benny
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
Search for more papers by this authorCorresponding Author
Dr. Mahesh Hariharan
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
Search for more papers by this authorEbin Sebastian
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
These authors contributed equally to this work.
Search for more papers by this authorAbbey M. Philip
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
These authors contributed equally to this work.
Search for more papers by this authorAlfy Benny
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
Search for more papers by this authorCorresponding Author
Dr. Mahesh Hariharan
School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram (IISER-TVM), Maruthamala P. O., Vithura, Thiruvananthapuram, Kerala, 695551 India
Search for more papers by this authorGraphical Abstract
Monomer-like aggregates: Null exciton coupling in an ideal Greek cross-dipole (+) assembly affords monomer-like optical properties and an exceptional charge-filtering (selective hole transport) effect in orthogonal chromophore stacks.
Abstract
Exciton interactions in molecular aggregates play a crucial role in tailoring the optical behaviour 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 the crystalline state. In contrast, nonzero exciton coupling in X-type (α=70.2°, PTE-Br0) and J-type (α=0°, θ=48.4°, PTE-Br4) assemblies have 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.
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