What is it about?
The phenomenon of excimer luminescence in aromatic hydrocarbons has been the subject of many theoretical and experimental works. This study examines the contribution of different intermolecular (non covalent) forces responsible for stabilizing naphthalene excimers.
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Why is it important?
The contributions of the various intermolecular forces responsible for stabilizing the singlet and triplet state excimers were examined using the Pertubation theory. The results show that the singlet excimer of naphthalene is more stable than the corresponding triplet excimer primarily due to large contributions of the exciton-resonance and the dispersion energy terms. The variation of the different energy terms with the conformations of the excimers suggests that the singlet and triplet excimers of naphthalene cannot have identical structure.
Perspectives
The present study reveals that the binding and the equilibrium conformation of the triplet excimer are controlled by the Van der Waal's dispersion forces as in the corresponding ground state dimer. The large stability of the singlet excimer is due to the exciton-resonance and the dispersion energy terms and not due to the exciton-resonance alone as was emphasised in the literatures. The conformational difference between the singlet and the corresponding triplet excimers is primarily due to the exciton-resonance energy.
E.J. Padma Malar
University of Madras
Read the Original
This page is a summary of: Singlet and triplet molecular interaction in excimers, January 1980, Springer Science + Business Media,
DOI: 10.1007/bf00576959.
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