FLUORESCENCE QUENCHING AND CHARGE-TRANSFER COMPLEXES OF PYRENE WITH PI-ACCEPTORS

The charge transfer (CT) complexes of pyrene with pi-acceptors such as tetracyanoethylene, 7,7,8,8-tetracyanoquinonedimethane, 2,3-dichloro- 5,6-dicyano-p-benzoquinone and p-chloranil were studied spectrophotome trically in solution using UV-visible and fluorescence spectroscopies. The effect of chemical structure of the accepters on equilibrium and spectroscopic parameters of the CT complex formation of pyrene was inv estigated. In addition, the role of medium viscosity, temperature and the influence of some accepters on the efficiency of the fluorescence quenching of pyrene was studied. The solid CT complexes of pyrene with some accepters were prepared and investigated with infrared and condu ctivity measurements.