Mixed Ligand Complexes of Cobalt(III)
- 1 November 1973
- journal article
- research article
- Published by Wiley in Zeitschrift für anorganische und allgemeine Chemie
- Vol. 402 (1) , 120-128
- https://doi.org/10.1002/zaac.19734020115
Abstract
Mixed ligand complexes of the type [CoIII(Lig)(LL)] · nH2O (Lig = dianion of Schiff bases of salicylaldehyde or substituted salicylaldehyde with diamine; LL = anions of acetylacetone, glycine, salicylaldehyde, oxine, or N‐phenyl‐salicylaldimine) and [CoIII(Lig)(LL)]ClO4 (LL = ethylenediamine or ethanolamine) have been prepared by the reaction of previously oxidised [CoII(Lig)] with appropriate bidentate ligands. The preceding oxidation of cobalt(II) complexes seems to be indispensible to the reaction, which does not occur in nitrogen. The reaction of CoII(acac)2 (acac = acetylacetonate anion) with appropriate LigH2 in presence of oxygen also yields [CoIII(Lig)–(acac)] · nH2O (n = 1–3). The preparation of binuclear complex [Co2(BSTN‐ol)3] · H2O (BSTN‐ol = dianion of N,N′(2‐hydroxy)trimethylene‐bis(salicylideneiminato)) is also described. In these chelates the quadridentate Schiff base presumably adopts the unusual non‐planar conformation, while the bidentate ligand occupies two cis‐positions. The preparation of the chelates of the type [CoIII(Lig)L2] (L = NH3, py, or OH; x = NO3, or nothing) is also reported, where the quadridentate Schiff base adopts usual planar conformation. The complexes have been studied by ir, uv, and visible spectra, molecular weights, molar conductances, elemental analyses, and magnetic techniques.Keywords
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