Hydroxy-substituted cyanoformazans and their use in...

Details Hydroxy-substituted cyanoformazans and their use in... Hydroxy-substituted cyanoformazans and their use in...

C - Chemistry, Metallurgy

09

B

260/153, 150/26,

C09B 50/00 (2006.01) C07F 3/00 (2006.01) G01N 33/50 (2006.01) G01N 33/84 (2006.01)

Patent

CA 1270817

HYDROXY-SUBSTITUTED CYANOFORMAZANS AND THEIR USE IN ANALYTICAL COMPOSITIONS AND METHODS Abstract of the Disclosure 1,5-Bis(2-hydroxyphenyl)-3-cyanoformazans substituted in at least one of the 3-, 4- and 5- positions of either phenyl moiety are useful for the determination of magnesium ions. The cyanoformazan substituents are chosen such that their cumulative Hammett-sigma value is greater than about 0.23. These cyanoformazans are useful in analytical com- positions and methods for either wet or dry assay of magnesium ions.

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