1966
DOI: 10.1063/1.1727185
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ESR and Phosphorescence Spectra of the Triplet States of Phenyl s-Triazines and Phenyl Benzenes

Abstract: ESR and optical measurements have been made on the lowest triplet state of a series of phenyl s-triazines and polyphenyl benzenes. The features of the phosphorescence spectra and the value of the zero-field splitting parameters of these azines and their hydrocarbon analogs leads to the assignment of the lowest triplet state of the phenyl triazines as (π, π*). The effect of nitrogen substitution is discussed.

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Cited by 26 publications
(5 citation statements)
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“…The vibrational structure in the phosphorescence of pCTRZ and mCTRZ resembles neither that observed in carbazole nor that of triazine. Rather, it closely resembles the structure obtained for carbazole-biphenyl derivatives, where the triplet state was found to be localized on the central two phenyl rings (Brinen et al, 1966 ; Bagnich et al, 2015a , b ). Thus, we conclude that the triplet state is dominated by the transition localized on the phenyl bridge and the triazine core, again in very good agreement with the theoretical predictions.…”
Section: Spectroscopic Analysissupporting
confidence: 80%
“…The vibrational structure in the phosphorescence of pCTRZ and mCTRZ resembles neither that observed in carbazole nor that of triazine. Rather, it closely resembles the structure obtained for carbazole-biphenyl derivatives, where the triplet state was found to be localized on the central two phenyl rings (Brinen et al, 1966 ; Bagnich et al, 2015a , b ). Thus, we conclude that the triplet state is dominated by the transition localized on the phenyl bridge and the triazine core, again in very good agreement with the theoretical predictions.…”
Section: Spectroscopic Analysissupporting
confidence: 80%
“…In contrast, there are no significant differences between HPTs and MPTs as far as phosphorescence lifetimes and triplet energies are concerned. According to Stueber et al. , this can be explained by the assumption that the phosphorescence originates from a triplet state of the photoexcited triphenyltriazine core (see refs and for triphenyltriazine phosphorescence spectra). An extension of the mesomeric system should then lead to a bathochromic shift of the phosphorescence maximum as is actually observed for the biphenyl derivative H-OH-B (Table ).…”
Section: Resultsmentioning
confidence: 99%
“…Figure 3 shows the decrease in the zero-field splitting |D|, with increasing EQE for the TADF molecules. The |D| values for 4Cz-IPN and PXZ-TRZ are significantly smaller than those for the lowest 3 ππ* states for the unit molecules in the TADF compounds, such as carbazole (|D| = 0.1022 cm −1 ), 16 11,12diphenyl-11H,12H-indolo[2,3-a]carbazole (|D| = 0.088 cm −1 , see Figure S4, Supporting Information), triphenyl-s-triazine (|D| = 0.124 cm −1 ), 17 phenoxazine (|D| = 0.1247 cm −1 ), 18 and cyanobenzene (|D| = 0.1371 cm −1 ), 19,20 whereas Cz-T and PIC-TRZ, respectively, have |D| values close to that of carbazole and indolocarbazole rather than s-triazine. Comparison of the zero field splitting parameter indicates that the T 1 states of Cz-T and PIC-TRZ have an electronic structure of 3 ππ* localized in the carbazole part ( lo T 1 ).…”
mentioning
confidence: 91%