Stereochemical effects on the catalytic properties of tricyclic Cu(II) complexes with bis(oxa, aza) chelate ligandsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Catalytic properties of Cu(II) tricyclic chelates of tetradentate Schiff bases from salicylaldehyde or enaminoketones from benzoylacetone and 1,2-ethylenediamine or 1,4-tetramethylenediamine were studied in cyclohexene liquid-phase oxidation by molecular oxygen. The initial catalytic activity of Cu(II) chelates of pseudotetrahedral structure based on 1,4-tetramethylenediamine is higher than the catalytic activity of square-planar Cu(II) complexes that are 1,2-ethylenediamine derivatives. The rate of the catalytic oxidation of cyclohexene in the presence of square-planar Cu(II) chelates is constant, whereas the catalytic activity of the pseudotetrahedral chelate, a derivative of salicylaldehyde, monotonically decreases and attains the steady-state value, which is different from that for the 1,2-ethylenediamine-based Cu(II) complex. The non-steady-state behavior of the pseudotetrahedral Cu(II) chelates is stipulated by rotational isomerization that yields a stable flattened isomer of lower catalytic activity.