Singlet quenching of chlorophyll a and pheophytin a by 2,4,7-trinitro-9-(fluoroenylidene)malononitrile: influence of ground-state complexation

✍ Scribed by L.V. Natarajan; M.Thandi Buthelezi; Laura R. Lim; Raymond Chang

• Book ID: 103032958
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 310 KB
• Volume: 197
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)86037-i

✦ Synopsis

The fluorescence quenching of chlorophyll a (Chl a) and pheophytin a (Pheo a) by 2,4,7-trinitro-9-(fluoroenylidene)malononitrile (TNFM) has been studied in acetonitrile and dichloromethane. There is evidence of 1: 1 ground-state complex formation between the donor (Chl a or Pheo a) and the acceptor (TNFM). Fluorescence lifetime measurements in acetonitrile indicate that the quenching is dynamic type by collisional interaction of TNFM with the uncomplexed fluorophore.