单宁酸和杨梅素与铁（III）配合物的研究

Investigation of complexes tannic acid and myricetin with Fe(III).

作者信息

Sungur Sana, Uzar Atike

机构信息

Department of Chemistry, Science and Letters Faculty, Mustafa Kemal University, 31024 Antakya, Hatay, Turkey.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2008 Jan;69(1):225-9. doi: 10.1016/j.saa.2007.03.038. Epub 2007 Mar 31.

DOI:10.1016/j.saa.2007.03.038

PMID:17493867

Abstract

The pH dependence of the complexes was determined by both potentiometric and spectrophotometric studies. Stability constants and stoichiometries of the formed complexes were determined using slope ratio method. Fe(III) was formed complexes with tannic acid of various stoichiometries, which in the 1:1 molar ratio at pH<3, in the 2:1 molar ratio at pH 3-7 and in the 4:1 molar ratio at pH>7. Fe(III) was formed complexes with myricetin in the 1:2 molar ratio at pH 4 and 5 and in the 1:1 molar ratio at pH 6. Stability constant values were found to be 10(5) to 10(17) and 10(5) to 10(9) for Fe(III)-tannic acid complexes and Fe(III)-myricetin complexes. Both tannic acid and myricetin were possessed minimum affinities to Cu(II) and Zn(II). They had less affinity for Al(III) than for Fe(III).

摘要

通过电位滴定法和分光光度法研究确定了配合物的pH依赖性。使用斜率比法测定了所形成配合物的稳定常数和化学计量比。Fe(III)与单宁酸形成了不同化学计量比的配合物，在pH<3时为1:1摩尔比，在pH 3 - 7时为2:1摩尔比，在pH>7时为4:1摩尔比。Fe(III)与杨梅素在pH 4和5时形成1:2摩尔比的配合物，在pH 6时形成1:1摩尔比的配合物。发现Fe(III)-单宁酸配合物和Fe(III)-杨梅素配合物的稳定常数分别为10(5)至10(17)和10(5)至10(9)。单宁酸和杨梅素对Cu(II)和Zn(II)的亲和力均最低。它们对Al(III)的亲和力比对Fe(III)的亲和力小。