Synthesis, characterization and catalytic activity of novel monometallic and bimetallic Mn(II) complexes with thiocarboxamide and phenanthroline ligands
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Abstract
Novel manganese(II) complexes, 1–3, involving 1,10-phenanthroline and thiocarboxamide ligands, were prepared and characterized structurally using single-crystal X-ray diffraction that revealed monometallic and bimetallic nature of the octahedral complexes. The catalytic activities of 1–3 were investigated in the oxidation of selected primary and secondary alcohols. During the optimization of the oxidation reactions, 1, a bimetallic manganese(II) complex bearing phenanthroline and bridging anthranilate showed higher activity as catalyst precursor than monometallic 2 or 3 in the oxidation of primary alcohols. The catalytic reactions were carried out in the presence of various oxidants such as molecular oxygen, hydrogen peroxide and tert-butyl hydroperoxide (TBHP) and additives such as acetic acid and imidazole. In this study, the oxidant/additive combination of TBHP and imidazole was shown to be effective for the oxidation of substrates investigated and the degree of their impact on oxidation reaction is highly dependent on a balanced ratio between them. 1 and 2 were selected as the most effective catalyst precursor under optimized reaction conditions and revealed efficient for the oxidation of selected primary and secondary alcohols, respectively.
期刊介绍：
Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc.
Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.
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