1975 Volume 48 Issue 6 Pages 1836-1841
New cobalt (III) complexes, [Co(en)2(H2N(CH2)nNH2)]X3 (n=4, 10, 12 and 14), [Co2(en)4(H2N(CH2)nNH2)2]X6 (n=4, 5, 6, 8, 10 and 12), [Co(en)2(H2N(CH2)4NH3)2]X5 and [CoCl(en)2(H2N(CH2)12NH3)]X3 were isolated from the products of reactions between [CoCl2(en)2]Cl and 1,ω-diaminoalkane in dimethylsulfoxide, with the aid of SP-Sephadex column chromatography. For n=5, 6 and 8, no monomeric [Co(en)2(H2N(CH2)nNH2)]3+ was observed. This result is compatible with instability of the medium size rings in organic compounds. The elution behaviors on Sephadex column and the visible and ultraviolet absorption spectra of the new complexes were also described.
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