Three new compounds, bis-(γ-aminobutyrato)-copper(II), bis-(δ-aminovalerato)-copper (II), and tetrakis-(ε-carboxyamylamine)-coppe(II) perchlorate, have been prepared. The first and the second compound belong to the bis-(glycinato)-copper(II) type, having a 7-and 8-membered ring, respectively. The last compound has a structure of ammine-derivative complex. In all cases preparations were carried out in non-aqueous media such as ether and chloroform. It has been concluded that the 8-membered ring is the highest ring for the formation of metal chelate compounds, so far as the copper(II) complexes of ω-aminocarboxylic acids are concerned. Stability of higher chelate rings was considered as the functions of steric constraints and electronic influences which may be induced with the separation of the two functional groups.
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Nakahara et al. (1956) studied this question.
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