Transient kinetic studies involving exciplex formation. Methods of analysis

✍ Scribed by Jacques Richer; Ginette Lessard; Michel Belletěte; Gilles Durocher

• Publisher: John Wiley and Sons
• Year: 1986
• Tongue: English
• Weight: 762 KB
• Volume: 18
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550181006

✦ Synopsis

In this paper, rate parameters are extracted from fluorescence decay data in the framework of Feedback-Type Kinetics (h, < k4). The exciplex dissociation ( h a ) and fluorescence decay rate constants (ha) have been obtained for the five following systems:

(1) Pyrene/n-hexane + ethyliodide ( k , = 3.8 x 10" s-'; h, = 1.7 x 10' s-?,

+ethanol (k4 = 1.45 x 10'" s-'; k , = 2.73 x 10* s-'), ( h , = 1.7 x 10" s-'; k , = 2.97 x 1 0 ' s -l i , ( k , = 6.7 + loy s k 8 = 5.04 x lo8 s-').

For this task we have added to the straight line method of Ware which is valid in certain cases only at high perturber concentrations, a new but similar Taylor series method applicable at low concentrations. Thereafter, a safer and more general method of kinetic analysis based on a quasi-linear ,yz minimization procedure has been developed and applies to data in any range of concentration.