ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Reversible Photoisomerizations of Sulfophthalein Indicator Dyes. IV. Stopped Flow Investigations on the Mechanism of the Base Induced Sulton Ring OpeningThe colour formation of rapidly mixed solutions of bromo thymol blue and organic bases in toluene obeys a biexponential rate law. The most probable reaction sequence is: Sulton (colourless) + base ⇌ ring opened H-bridged complex (λmax ≈ 420 nm) ⇌ H-bridged ion pair (λmax ≈ 400 nm). Alternative reaction schemes of the same complexity could be ruled out though the underlying kinetic problem is underdetermined. As a generalizing conclusion it is stated that valuable mechanistic and kinetic information may be derived from underdetermined kinetic problems by calculating the ranges of physically meaningful solutions for the unknowns which are compatible with the particular kinetic schemes instead of the unavailable singular solutions.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19853270407
