Abstract
From the detailed analysis of emission and absorption spectra of 2,6-diphenyl pyridine (DPP), m-terphenyl (MTP) and 2,6-luitidine (LTD) in different solvents, a striking change in absorption and emission characteristics of DPP compared to others could be observed. Consideration of through-space interaction of nonbonding electrons of the N atom and the π electrons of the outer rings becomes significant in explaining the dramatic change of absorption and emission character of the title compound in relation to a polyphenyl, MTP. The lowest excited singlet state of DPP is identified as 1L a, indicating a crossover of states relative to MTP.
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