Chromogenic reagents

Details Chromogenic reagents Chromogenic reagents

C - Chemistry, Metallurgy

07

D

C07D 498/08 (2006.01) C09B 29/26 (2006.01) G01N 21/79 (2006.01) G01N 31/22 (2006.01) G01N 33/52 (2006.01) G01N 33/84 (2006.01)

Patent

CA 2142117

2142117 9404539 PCTABS00030 Chromogenic reagents, and more particularly compounds which function as selective cation-sensitive dyes are disclosed. The compounds are of formula (II) wherein X is a chromophore; Y and Z are -CH2(CHR-O-CHR)nCH2- in which n is an integer from 1 - 10 (which may be different for Y and Z) and each R independently is hydrogen or a substituent for hydrogen or when n is an integer from 2-10 at least one -CHR-CHR- group may additionally represent a substituted or unsubstituted arylene group; W indicates one or more optional substituents on the benzene ring; and A is a group imparting acidity to the molecule. Preferred compounds are those in which n = 2 for Z and n = 1 or 2 for Y; X is 4-nitrophenylazophenol and R is hydrogen or additionally when n is 2 at least one -CHR-CHR- group may represent a substituted or unsubstituted arylene group.

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