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Stereochemical factors and the catalytic activity of tricyclic Cu(II) complexes with tetraaza chelate coresстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Zakharov A.N., Zefirov N.S.
- Журнал: Kinetics and Catalysis
- Том: 39
- Номер: 4
- Год издания: 1998
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 493
- Последняя страница: 501
- Аннотация: The catalytic activity of tricyclic Cu(II) complexes with tetradentate Schiff bases based on o-aminobenzaldehyde, 1,2-ethylenediamine (I), or 1,4-tetramethylenediamine (II) was studied in the model liquid-phase reaction of cyclohexene oxidation by molecular oxygen. The Schiff bases had tetraaza chelate cores with square-planar and pseudotetrahedral structures. The initial catalytic activity increased when the square-planar structure changed to distorted tetrahedral as agrees with the general trend of allied Cu(II) complexes with bis(oxa, aza) chelate cores. Comparison of the catalytic behavior of Cu(II) chelates of similar spatial structure having different ligand-binding atoms points to the absence of the influence of close neighborhood on the mechanism of cyclohexene oxidation. Chelates with tetraaza cores exhibited higher catalytic activity. In the presence of the square-planar chelate I, the rate of cyclohexene oxidation is not stationary. This property distinguishes I from similar Cu(II) chelates with tetradentate Schiff bases, enaminoketones, or hydrazone imines. The nonstationary oxidation of cyclohexene in the presence of complex II agrees with the model of the rotational isomerization of chelate core, which was discovered earlier for distorted tetrahedral complexes.
- Добавил в систему: Зефиров Николай Серафимович