Abstract
AbstractPhenyl‐azo naphthalene dyestuffs, which are substituted in o and in o′ position by hydroxy and amino (or alkylamino) groups, have been metallised with agents releasing either CoII ions or CoIII ions, the 1:2 complexes formed being examined by means of electrophoresis and alkalimetric titrations. The amino or alkylamino groups are deprotonised only if they are in the naphthalene radical, or, if present in the benzene radical they are acidified by electrophilic substituents. Metallising with CoII ions yielded usually 1:2 CoIII complexes. With one particular dyestuff, however, a 1:2 CoII complex was obtained; it is assumed that this is due to a relatively lower oxidation potential of this dyestuff.
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