Photofading of basic triphenylmethane dyes: Evidence for electron transfer

1981 ◽  
Vol 2 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Norman S. Allen ◽  
Baghar Mohajerani ◽  
John T. Richards
Keyword(s):  
Electron Transfer ◽  
Triphenylmethane Dyes ◽  
Basic Triphenylmethane Dyes

Gleichgewichtsuntersuchungen an basischen Triphenylmethan-Farbstoffen in Methanol / Investigations of Equilibria on Basic Triphenylmethane-dyes in Methanol

1971 ◽  
Vol 26 (2) ◽  
pp. 99-105 ◽  
Author(s):  
Waldemar Broser ◽  
Heinrich Fleischhauer
Keyword(s):  
Equilibrium Constants ◽  
Water Soluble ◽  
Triphenylmethane Dyes ◽  
Buffer Solutions ◽  
Basic Triphenylmethane Dyes

The pKs* of the equilibrium between the monoacid dyecation and the methylester of twelve organometalically synthesised triphenylmethane dyes were measured spectrophotometrically in methanolic buffer solutions.The pKs of the water-soluble dyes were used to derive an equation, which allows calculation of the pKs (aqueous) of the water-insoluble dyes.The experimental equilibrium constants, which can be interpreted by HMO calculations, satisfy the Hammett ρ-σ-equation.

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