Electronic Absorption and Emission Spectra of 1, 3‐Diaryltriazenes

Abstract

SummaryThe Pariser-Purr-Pople (PPP) type LCI-SCF-MO calculations were used to study the models of 1,3-diphenyltriazene (l), 1,3-bis (3-pyridy1)triazene (2), 1,3-bis (2,4-dichloropheny1)triazene (3), and 1,3-bis (4-ethoxycarbony1)triazene (4). The results of the calculations were compared with the experimental electronic absorption and emission (fluorescence, phosphorescence) spectra of these compounds.Introduction. -In several previously published papers on triazenes, electronic spectra were utilized to study their tautomeric structures [ 1-61. Our interest in the photochemical behavior of 1,3-diaryltriazenes [7] [8] has prompted us to investigate their electronic absorption and emission spectra and to compare the experimental results with the calculated transitions obtained by using the PPP (Pariser-ParrPopZe, LCI-SCF-MO) method. The four compounds selected for this study were 1,3-diphenyltriazene (diazoaminobenzene) (l), 1,3-bis (3-pyridy1)triazene (2), 1,3-bis (2,4-dichlorophenyl)triazene (3), and 1,3-bis (4-ethoxycarbony1)triazene (4).

The synthesis, X‐ray structure analysis, and photophysical characterization of 4‐[(E)‐2‐(4‐cyanophenyl)diazenyl]‐morpholine

“…All observed emission was assigned to a p*!p transition centered on the triazene moiety. The observed absorption and emission properties of 1 agreed with those found in the literature for similar compounds [17,18]. The synthesis of 1 was attractive for its operational simplicity, good yield and its use of inexpensive starting materials.…”