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The p-Terphenyl (donor) and 4-aminobenzophenon (acceptor) system in solvents of different static dielectric constants was studied by the fluorescence quenching due to nonradiative energy transfer. The dependence of I ṽ/n 4  (I ṽ is the overlap integral of the fluorescence spectrum of donor and the absorption spectrum of acceptor, n the refractive index of the solvent) on the polarity of the solvents was investigated. From the linear relation between (η D  0 /η D  - 1) (η D  0 /η D  is the relative quantum yield of the donor fluorescence) and I ṽ/n 4  the intermoleculare distance R for a given acceptor concentration in different and also mixed solvents were determined.

zeitschrift für naturforschung a

Energieübertragung zwischen gleich- und ungleichartigen Molekülen in Lösung.: IV. Fluoreszenzlöschung von p-Terphenyl durch 4-Aminobenzophenon in Lösungsmitteln verschiedener Dielektrizitätskonstanten/ Energy Transfer Among Like and Unlike Molecules in Solution.