ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
(1)The relative acidity constants K′ of derivatives of 3-methyl-4-dimethyl-amino-azobenzene substituted in the 3′-or 4′-position follow the Hammett relationship for substituted benzene derivatives (ϱ = + 0.46)(2)The relative acidity constants of substituted mono-protonated 4-dimethyl-amino-azobenzenes (DAB) follow the Hammett relationship with most substituents (ϱ = + 0.77). Significant deviations are observed with -M-substituents in 4′-position (NO2, COCH3, CN): the acidifying effect of these substituents is smaller than expected(3)Molar extinction coefficients and acidity constants are dependent on the concentration of these DAB derivatives. It can be demonstrated that these compounds are highly aggregated, even in very dilute solutions.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19620450620
Permalink