Effect of magnetic field on luminescent exterplexes: the diphenylbutadiene-dimethylaniline system

The excited state complexation reaction between 1,4-diphenyl-1,3-butadiene and N,N-dimethylaniline was studied. In a sufficiently polar medium, 1: 2 complexes (or exterplexes) were formed. This exterplex system is magnetic field (MF) sensitive. The various parameters which characterize the MF effect in radical ion pair systems, namely wavelength dependence of the MF, field dependence, dielectric constant dependence and time dependence, were studied. The anomaly between the theoretically estimated and experimentally determined B 1 2 values was explained on the basis of the hopping mechanism.