Chromatographic separation of geometric isomers of lambda(OB)-tris-(1-propylenediamine)cobalt(III) ion

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(Received 19 February 1973) There are four possible isomers for trls(l-propylenedlamine)cobalt(lll) ion, A(lel)(fac), A(lel)(mer), /k(ob)(fac) and A(ob)(mer). Among them the ~(lel)(fac) isomer has been well studied for various properties including the absolute conflguration(1). In 1968 MacDermott(2) separated the A (lel)(mer) isomer from the ~(lel)(fac) isomer by fractional crystallizatlon, but the former was isolated only as amorphous glasses, and it was not possible to determine its crystal structure(3). We have isolated the A(ob)(fac) and A (ob)(mer) isomers in pure states by the column chromatography on ion-exchange Sephadex(4)(FIG.l). The [Co(l-pn)3]3+ ion was prepared by reacting 1 mole of [CoBr(NH3)5]Br 2 and 3 moles of l-propylenediamlne(l-pn) in the presence of active charcoal, and the resulted solution was subjected to column chromatography after removal of charcoal. One to two milllmoles of the prepared complex was adsorbed on a column (@2.7 x 135 cm) of SP-Sephadex and eluted with a 0.18M solution 2~. (mer) j~. (fac)

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