Stability Constants of the Copper (II) and Zinc (II) Chelates of 3,4-Dihydroxybenzaldehyde in Aqueous Solution
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The conditional stability constants of the chelates of 3,4-dihydroxybenzaldehyde (LH_2) with Cu (II) and Zn (II) (M^<2+>), defined as K_1=[ML]/([M^<2+>][LH_2]) and K_2=[ML_2^<2->]/([ML][LH_2]), in 0.2M MES buffer (pH, 5.6) at various temperatures were calculated from the absorption at 350nm of the solution containing varying concentrations of the ligand and the metal ions. From the method of least squares, we obtained log K_1=4.38 (21℃), 4.51 (30℃) and 4.44 (37℃) for the Cu (II) chelate, and log K_1=1.53 (37℃) for Zn (II) chelate. The value of K_2 for the Cu (II) chelate at 37℃ was log K_2=0.442±0.5 and that of the Zn (II) chelate was too small to obtain reliable results by the present method.
- 共立薬科大学の論文
- 1988-03-25
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