Synthesis and characterization of 2',7'-diarylspiro[cyclopentane-1,9'-fluorene] derivatives

摘要

A series of 2',7'-diarylspiro[cyclopentane-1,9'-fluorene] symmetrical derivatives containing different terminal aromatic units have been synthesized by employing palladium-catalyzed C-C cross-coupling reactions and characterized with respect to the optical and thermal properties. Their absorption and fluorescence properties were investigated. These compounds possess good fluorescence-emitting ability with phi (FL) values in the region of 0.67-0.92 in solution and display strong blue emission. The derivatives also showed good thermal stabilities with decomposition temperatures (T (d)) in the range of 265-386 A degrees C. Structure-optical behavior characteristics and further details of the electronic properties from cyclic voltammetry measurements and theoretical calculations were discussed.