Radiative exciplexes of 1,2,4,5-tetracyanobenzene with sterically hindered alkylbenzenes

The formation of radiative exciplexes of a series of electron donor-acceptor pairs of 1,2,4,5-tetracyanobenzene (TCB) and bulky alkyl-substituted benzenes is reported for the first time in nonpopular solvents BEN, TOL, and PXY. Exciplexes of donor-acceptor pairs of bulky and flat donors with similar structures and electron-transfer properties give almost the same fluorescence quantum yields.