Protonation of chloro-, bromo- and iodo-pentacyanocobaltate(III) complexes

被引：4

作者：

Ojo, JF ^{[1
]}

Ige, JD ^{[1
]}

Ogunlusi, GO ^{[1
]}

Owoyomi, O ^{[1
]}

Olaseni, ES ^{[1
]}

机构：

[1] Obafemi Awolowo Univ, Dept Chem, Ife, Nigeria

来源：

TRANSITION METAL CHEMISTRY | 2006年 / 31卷 / 03期

关键词：

D O I：

10.1007/s11243-005-6398-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The reactions between Fe(Phen)(3)(2+) [phen= tris-( 1,10) phenanthroline] and Co( CN)(5)X3- (X= Cl, Br or I) have been studied in aqueous acidic solutions at 25 degrees C and ionic strength in the range I= 0.001 - 0.02 mol dm(-3) (NaCl/HCl). Plots of k(2) versus root I, applying Debye - Huckel Theory, gave the values -1.79 +/- 0.18, -1.65 +/- 0.18 and 1.81 +/- 0.10 as the product of charges (Z(A)Z(B)) for the reactions of Fe(Phen)(3)(2+) with the chloro-, bromo- and iodo-complexes respectively. Z(A)Z(B) of approximate to - 2 suggests that the charge on these Co-III complexes cannot be -3 but is -1. This suggests the possibility of protonation of these Co-III complexes. Protonation was investigated over the range [H+]= 0.0001 -0.06 mol dm(-3) and the protonation constants K-a obtained are 1.22 x 10(3), 7.31 x 10(3) and 9.90 x 10(2) dm(6) mol(-3) for X= Cl, Br and I, respectively.

引用

页码：337 / 339

页数：3

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