𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Deactivation of the lowest triplet state of 4-H- 1 -benzopyran-4-thione in different solvents

✍ Scribed by Marek Sikorski; Włodzimierz Augustyniak; Igor V. Khmelinski; Valery V. Korolev; Nickolai M. Bazhin

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
488 KB
Volume
209
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

✦ Synopsis

Investigation of 4-H-I-benzopyran-4-thione (BPT) in its triplet state was performed in a flash photolysis system. The kinetics of phosphorescence and transient triplet-triplet absorption decay of BPT were measured in deoxygenated solutions. The studies were made with both protic and aprotic solutions of different polarity (ethanol, benzene, acetonitrile, n-hexane, n-hexadecane and 3-methylpentane). The rate constants of intramolecular decay Ire as well as the self-quenching rate constants k, for BPT at room temperature were determined. The results confirmed the essential nature of the contribution from the self-quenching process in the deactivation of the BPT triplet state. The k, values suggest that this process is near diffusion controlled, as is the case for other thioketones.

📜 SIMILAR VOLUMES

Some novel aspects of regioselectivity i
Some novel aspects of regioselectivity in 1,3 dipolar cycloadditions of 4h-1-benzopyran-4-thione
✍ Arpan K. Baruah; Dipak Prajapati; Jagir Sandhu 📂 Article 📅 1988 🏛 Elsevier Science 🌐 French ⚖ 326 KB

4H-1-Benzopyran-4-thione (1) reacted smoothly with nitrilimines (3a-e) to afford regioselective cycloadducts (4a-e) in good yields. In contrast, benzunitrile oxide (6) and aldonitrones (7a-d) reacted preferentially at the thione function. The unstable cycloadduct (8) or ( 9) ruptured to give as isol

Factor group splitting in the lowest tri
Factor group splitting in the lowest triplet state of p-benzoquinone-d4 crystals
✍ Hendrik Veenvliet; Douwe A. Wiersma 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 361 KB

Polzrizec! Stark-modulated Zceman absorption experiments on p-benzoquinonedc single crystds at 2 Ii show the fzctoi goup sp!itting in the origin of the lowest Big (n;;\*) rrip1e.t state at 1854s cinvl io lx 0.6ZO.06 cm-', Tine ordering OF the crystal states is such that the orbitd p!us skte ties at