Highly luminescent multifunctional hemi-ortho ester derivatives of fullerenol

The present article describes successful evaluation of interesting photophysical properties of multiple double bond terminated fullerene core star-like acyclic hemi-ortho esters. These hemi-ortho ester derivatives are synthesized by the selective nucleophilic addition reactions of fullerenol on to the carbonyl group of the different vinyl esters. The ground state electronic interactions are observed from the appearance of the structured absorption bands in the UV–vis spectra. Photoexcited state electronic transition from S1 to hu and formation of charge transfer exciplex is detected from the appearance of strong emission energy peak at 1.85–1.87 eV and quenching of luminescence intensity compared to fullerenol and vinyl esters.