Photoinduced processes in bis(diethylaminobenzylidene)cyclohexanone and its bis(aza-18-crown-6)-containing analogue in acetonitrile

• Published in: High energy chemistry Vol. 50; no. 6; pp. 442 - 446
• Main Authors: Zakharova, G. V., Zyuz’kevich, F. S., Gutrov, V. N., Nuriev, V. N., Vatsadze, S. Z., Plotnikov, V. G., Avakyan, V. G., Gromov, S. P., Chibisov, A. K.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-11-2016; Springer Nature B.V
• Subjects: Acetonitrile; Ambient temperature; Chemistry; Chemistry and Materials Science; Cyclohexanone; Fluorescence; Phosphorescence; Photonics; Physical Chemistry; phosphorescence; photoisomerization; laser photolysis; dienones; fluorescence
• ISSN: 0018-1439; 1608-3148
• DOI: 10.1134/S0018143916060205

Photoinduced processes in bis(diethylaminobenzylidene)cyclohexanone (CH1) and its bis(aza-18-crown-6) derivative (
CH2
) in acetonitrile at ambient temperature and 77 K have been studied. The absorption, fluorescence, and phosphorescence spectra of CH1 and CH2 are similar. The probability of the formation of the triplet state is higher for CH2 molecules (λ
T-T
max
= 660 nm, lifetime τ
T
~ 20 μs). The lifetime of the CH1 molecule in the triplet state is estimated at τ
T
~ 2–3 μs. Photoisomers of CH1 and CH2 are formed along with the triplet state. According to DFT calculation results, the formation of
trans–cis
photoisomers of CH1 and CH2 is the most energetically favorable.