A SPECTROPHOTOMETRIC STUDY OF COMPLEX FORMATION BY IRON(III) AND 2,3-DIMERCAPTO-1-PROPANOL IN ALKALINE SOLUTIONS

被引:13
作者
Leussing, D. L. [1 ]
Mislan, J. P. [1 ]
机构
[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA
关键词
D O I
10.1021/j100841a025
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Iron(III) and 2,3-dimercapto-1-propanol (DMP) react in alkaline solutions to form the red complex FeDMPOH. The formation constant of this species is 5 X 10(+30) as determined by competition with EDTA at 25 degrees in 0.10 M ammonium chloride. The complex FeDMP(NH(4))OH with a formation constant of about 7 X 10(+31) is also formed in ammoniacal solutions. In the more alkaline of those solutions studied in the present investigation (up to pH 11.00), the +3 valence state of iron is stable in the DMP systems. This is in contrast to the cysteinate and mercaptoacetate systems where reduction to iron(II) is accompanied by oxidation of the mercaptan to disulfide. With bidentate ligands steric factors seem to limit to two the number of sulfur atoms coordinated to an iron(III) nucleus.
引用
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页码:1908 / 1910
页数:3
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