Base hydrolysis and aquation of trans-methyl-substituted acidopenta-amminecobalt(III) complexes

被引：5

作者：

Benzo, F

Massaferro, A

Queirolo, M

Sienra, B

Capparelli, A

Martire, DO

机构：

[1] FAC QUIM MONTEVIDEO, MONTEVIDEO, URUGUAY

[2] INST INVEST FIS QUIM TEORICAS & APLICADAS, FAC CIENCIAS EXACTAS, LA PLATA, ARGENTINA

来源：

POLYHEDRON | 1996年 / 15卷 / 12期

关键词：

D O I：

10.1016/0277-5387(95)00473-4

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Base hydrolysis and aquation of trans-[Co(NH3)(4)(NH2CH3)X](2+) (where X = Cl, Br and NO3) complexes are reported. Both types of reactions are four to eight times faster than the corresponding reactions for [Co(NH3)(5)X](2+) complexes. The positive activation entropies of the base hydrolysis for all the studied trans-[Co(NH3)(4) (NH2CH3)X](2+) ions and the stereochemistry of the hydroxo products are indicative of a dissociative conjugate base, Dcb, mechanism. The steric course of the base hydrolysis differs significantly from that of the parent penta-ammines. For the aquation reactions, the activation enthalpies of the tr ans-methylamine and penta-ammine complexes are similar, while the activation entropies are more positive (or less negative) for the former. These results are interpreted in terms of an I-d mechanism.

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页码：1915 / 1921

页数：7

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