Metallkomplexe mit Polyaminen XI: Mit cis‐ und trans‐1,2‐Diaminocyclohexan

Abstract

Abstract The complex formation of cis‐ and trans‐1,2‐Diaminocyclohexan with the ions H + , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , Cd 2+ has been studied. The metal complexes of the trans‐diamine are slightly more stable than the corresponding complexes of ethylenediamine, which is probably due to a somewhat more positive entropy term of the formation reaction. The complexes of the cis‐compound are somewhat less stable than those of the trans‐diamine. The distance between the two basic nitrogen atoms are almost certainly the same in both diamine molecules. The cis‐compound, however, has a less favourable geometry for complex formation, because the chelate ring and the 6‐membered carbon ring do not lie in the same plane as will be the case with the complexes of the trans‐diamine.