Table 3 The stoichiometry and association constants of MTB complexes with ZnII, CuII, and FeII at the aqueous solution (pH 5).

From: Study of interaction of metal ions with methylthymol blue by chemometrics and quantum chemical calculations

MIs

Stoichiometry

Association constants

 

ZnII

Zn(MTB)2

Log Ka1

4.45 (± 0.03)

Zn(MTB)

Log Ka2

3.18 (± 0.05)

CuII

Cu(MTB)2

Log Ka1

5.64 (± 0.06)

Cu(MTB)

Log Ka2

3.49 (± 0.02)

FeII

Fe(MTB)

Log Ka1

6.96 (± 0.04)

Fe2(MTB)

Log Ka2

4.81 (± 0.05)

  1. Numbers in parentheses indicate the standard deviation values (n = 3).
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