Cobalt(III) complexes with quadridentate ligands. VII. The preparation and properties of the salicylato or dichloro[tris(2-aminoethyl)amine]cobalt(III) complexes and the related complexes.

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Salicylato- or 3-methyl(or 4-methyl)salicylato[tris(2-aminoethyl)amine]cobalt(III) complexes, [Co(R-sal)tren]Cl·nH2O (R: H, CH3) have been prepared from a reaction mixture of dichloro[tris(2-aminoethyl)amine]cobalt(III) chloride hydrate, [CoCl2(tren)]Cl·H2O, Ag2O, and salicylic acid or 3-methyl- or 4-methylsalicylic acid. Two geometrical isomers (t- and p-) of their complexes were separated by Dowex 50W-X2 column chromatography. Their t- and p-isomers have been established by their 1H NMR and absorption spectra. The formation ratio of t- and p-isomers is ca. 3:1. The isomerization between t-isomer and p-isomer was not observed in water and methanol. In the absorption spectra, the first absorption band for the t- and p-isomers was observed at 535 nm and 515 nm, respectively. In the 1H and 13C NMR spectra of [CoCl2(tren)]Cl·H2O, the signals of the tertiary amine, (Remark: Graphics omitted.), side methylene protons and methylene carbons have been assigned to the individual methylene protons and methylene carbons of the coordinated tris(2-aminoethyl)amine ligand.
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