α,β,γ,δ-四-(羟基苯)卟吩与锌离子络合物光度特性的研究

Spectrophotometric Study of the Reaction of Zinc With α, β, γ, δ-Tetrakis (hydroxyphenyl) porphine

为探讨羟基苯卟吩与锌离子络合物的光度特性,对三种新合成的卟啉化合物与锌离子的显色反应分别作了研究和比较。实验表明T-(3-HP)P所生成的络合物的灵敏度最高,其表观摩尔吸光系数达4.76×10~5L·mol^(-1)·cm^(-1)。本文还就试剂的分子结构与显色反应的某些规律作了初步的讨论。

Three new porphyrin compounds, namely α, β, γ, δ, -tetrakis (2-hydroxyphenyl) porphine(Ⅱ), α, β, γ, δ-tetrakis (3-hydroxyphcnyl) porphine (Ⅱ) and α, β, γ, δ-tetrakis (3, 4-dihydroxyphenyl)porphine (Ⅲ), were used as spectrophotometric reagents for zinc (Ⅱ) ion. The optimum pH ranges for the complexing reactions of Ⅰ, Ⅱ and Ⅲ with Zn (Ⅱ) were found to be 9.5～10.2, 8.8～9.3 and 6.2～7.3, respectively. Beer's law was obeyed in the concentration rangeor of 0～0.24, 0～0.28 and 0～024 μg/ml and the aparent molar absorptivities were 3.23×10~5, 4.76×10~5 and 8.1×10~4L·mol^(-1), cm^(-1) and the relative standard deviations were 1.11%, 1.08% and 2.20%(n=18), respectively. The effects of the molecular structure of the above mentioned reagents on their sphotometric properties were also discussed.