Combined visible spectroscopy-conductance-electrospray mass spectrometry studies of paramagnetic catalysts.: Speciation of Jacobsen's manganese salen complex in the presence of σ-donor ligands, hydroxide sources, and cumyl hydroperoxide

被引：19

作者：

Chipperfield, JR ^{[1
]}

Clayton, J

Khan, SA

Woodward, S

机构：

[1] Univ Hull, Dept Chem, Kingston Upon Hull HU6 7RX, Yorks, England

[2] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England

来源：

JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS | 2000年 / 07期

关键词：

D O I：

10.1039/b001059f

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Combined multi-technique (visible spectroscopy, conductance, electrospray MS) experiments have been applied to the study of Jacobsen's manganese salen complex, JCl. Equilibria between JCl and sigma-donors L (heterocyclic amines and 4-phenylpyridine N-oxide) form labile octahedral salts [J(L)(2)]Cl as the major solution species. Many samples of JCl are found occasionally to contain small amounts of an impurity whose kinetic behaviour suggest it is JOH. The compound JOH may also be generated by Bu4NOH addition to JCl. In the presence of an excess of cumyl hydroperoxide CHP and N-methylimidazole, JOH is converted into a green intermediate, characterised by mass spectrometry as [J(2)(O)](+). This intermediate undergoes first-order decomposition in the presence of CHP regenerating JOH.

引用

页码：1087 / 1094

页数：8

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