Picosecond reversible reaction kinetics of excited p-dimethylaminoacetophenone and m-methyl-p-cyanodimethylaniline studied by oxygen quenching technique

✍ Scribed by E. Kirkor-Kamińska; K. Rotkiewicz; A. Grabowska

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 472 KB
• Volume: 58
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(78)85057-x

✦ Synopsis

Double fluorescence of p-dimethylacetophenone (DMAPh) in CHaCN and m-methyl-p-c&nodimethyhudliue (MCDMA) iu CHaCia has been observed and analyzed iu terms of reversible excited state isomerisation of the primary excited form b* to the strongly poiar rotamer a*. Using the oxygen quenching technique, the kinetics of the reactions have been solved and all rate constants separated_ The "formal" thfetimes of the species b*, ~b = (kbf t kbd + kba))-r , are 1 ps and 2.2 ps for DYAPh and MCDMA, respectively. The fust value fits well to the reorientation relaxation rime of acetouitrile.