THE MONOMERIC FORM OF A COBALT(III) COMPLEX OF A TETRAAZA MACROCYCLICLIGAND WITH A DANGLING CARBOXYLATE ARM

The monomeric structure of hloro[3-(1,4,7,10-tetraazacyclododecan-1-yl )toluic acid-kappa(4)N] cobalt(III) chloride monohydrate, [CoCl2(C16H2 6N4O2)]Cl.H2O, has been determined. Previous work has only yielded cry stals of the dinuclear complex or the monomeric complex in powdered fo rm. Crystallization was effected from concentrated hydrochloric acid w hich contributed to the retention of the chlorides coordinated to the cobalt as well. as providing the chloride counter-anion. Hydrogen bond ing of the hydroxyl group of the carboxylic acid function to the chlor ide counter-anion played a significant role in the formation of crysta ls of this species.