Intramolecular excimer formation of the diastereoisomers of bis[1-(2-pyrenyl)ethyl] ether as revealed by picosecond time-resolved absorption spectroscopy

Abstract

Excimer formation of the diastereoisomers of bis[1-(2-pyrenyl)ethyl] ether has been studied by picosecond time-resolved absorption spectroscopy. The rise time of intramolecular excimer (which corresponds to the time of 1 3 rotation of the backbone chain) was determined to be 280 ps for meso-B2PEE and ≈ 20 ns for rac-B2PEE in isooctane. The absorption spectrum of a full-overlap sandwich pyrene excimer has been confirmed for the first time without any contribution of other geometrical structures.