Electrochemistry of 9,9′-bifluorenylidene: Detection of the radical species by spectroelectrochemical and EPR methods

Abstract

It is shown by cyclic voltammetry and differential pulse polarography that 9,9′-bifluorenylidene (BFD) undergoes two successive reduction waves in ap a reversible ( E 1 = −1.10 V SCE) followed by a quasi-reversible ( E 2 = −1.50 V SCE) couple. These were monitored by spectrochemical m monoelectronic transfers. The monoradical was detected by EPR, and the spectrum interpreted in terms of delocalization of the unpaired electron on the