Abstract
AbstractA positive magnetic field effect (MFE) on the luminescence of three different N,N,N',N'‐tetraalkyl‐p‐phenylenediamines (TAPD) has been detected by field‐modulated MARY (MAgnetic Field Effects on Reaction Yields) spectroscopy in a binary solvent mixture of toluene/dimethylsulfoxide containing more than 20% vol. dimethylsulfoxide and in neat dimethylsulfoxide. The p‐phenylenediamine derivatives' luminescence in these solvents could be increased by application of small external magnetic fields in the order of less than 30 mT (1T = 104G) and the B1/2 values could be measured. In a comparative experiment the N,N‐dimethylaniline (DMA) fluorescence did not show such a behaviour. In conclusion a reaction scheme involving an electron transfer process between the p‐phenylenediamines and the solvent dimethylsulfoxide is suggested.
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