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Energy of the TCNQ triplet state in phenazine—TCNQ and fluorene—TCNQ crystals

✍ Scribed by E.L. Frankevich; A.N. Chaban; M.M. Triebel; J.U. von Schütz; H.C. Wolf

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
364 KB
Volume
177
Category
Article
ISSN
0009-2614

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✦ Synopsis

Using magnetic field effect measurements ofthe fluorescence of oriented phenazine-TCNQ (Ph/TCNQ) and fluorene-TCNQ (F/TCNQ) crystals as a function of excitation power and temperature. we were able to reveal the singlet depletion path St (T+T) which is thermally activated: for F/TCNQ with AE= 3226 cm-', for Ph/TCNQ AEE= I1 30 cm-'. Assuming 2&=&t AI?, the triplet energies are 8865 cm-' for Ph/TCNQ and 9865 cm-' for F/TCNQ. The difference in the energy can bc attributed to different stabilization energies of the ground states of the complexes.

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The reported Raruan spectrum of the Rb TCNQ salt allows, for the fll time, examination of all the vibrational features of the TCNQ: radical anion. The knowledge of the TCNQ= fundamental frequencies as well as of those for neukalTCNQ makes it possible to interpret the infrared and Raman spectra of Cs