کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1235272 | 968844 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Investigation of complexes tannic acid and myricetin with Fe(III) Investigation of complexes tannic acid and myricetin with Fe(III)](/preview/png/1235272.png)
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 105 to 1017 and 105 to 109 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).
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 69, Issue 1, January 2008, Pages 225–229