Luminescence of 5-Phenyltetrazole and its Derivatives Part III. Quantum Yields and Mean Lifetimes of Fluorescence

Abstract

L u m in escen ce o f 5 -P h e n y lte tr a z o le a n d its D e riv a tiv e s P a r t III.Q u a n tu m Y ie ld s a n d M e a n L ife tim e s o f F lu o r e s c e n c e I. Gryczyński and A. Kawski Luminescence Research Group, Institute of Experimental Physics, University of Gdansk, Gdansk, Poland A Rażyńska and Z. Grzonka Institute of Chemistry. University of Gdansk, Gdansk, Poland Z. Naturforsch. 39a, 960-962 (1984); received August 9, 1984 Quantum yields and mean lifetimes of fluorescence have been measured of 5-phenyltetrazole and its three methyl derivatives, para-, meta-and ortho-methyl-5-phenyltetrazole. The rate constants, k¥, of the radiative transition Sj -»• S0 have been deduced from these measurements. The mean lifetimes, rF, the quantum yields of fluorescence and the rate con stants have been found to be clearly dependent on the position of the methyl substituent in the ring and could be arranged as follows: tp > tp1 > tf and > k? > .