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Metal Complexes with Macrocyclic Ligands, XVIII. A study of steric effects in the Co2+-, Ni2+- and Cu2+-complexes with 1-(2-aminoethyl)- and 1-(2-dimethylaminoethyl)-4,8,11-trimethyl-1,4,8,11-tetraazacyclotetradecane

✍ Scribed by Arup. K. Basak; Thomas A. Kaden

Publisher
John Wiley and Sons
Year
1983
Tongue
German
Weight
395 KB
Volume
66
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The two macrocycles 1‐(2‐aminoethyl)‐ and 1‐[2‐(dimethylamino)ethyl]‐4, 8, 11‐trimethyl‐1, 4, 8, 11‐tetraazacyclotetradecane, 1 and 2, respectively, and their metal complexes with Co^2+^, Ni^2+^ and Cu^2+^ were prepared. The different spectral properties of the complexes with these two ligands can be rationalized by assuming that, in the case of 1, the amino group of the pendant arm is axially coordinated to the metal ion giving a pentacoordinate structure, whereas the dimethylamino group of 2 cannot bind because of sterical hindrance. This is also corroborated by the observation that the complexes of 2 react with unidentate ligands such as N and SCN^−^ to give ternary species MLX^+^, whereas those of 1 do not. This indicates that the complexes of 1 have no free coordination site, their coordination sphere being completely saturated by the five N‐atoms of the macrocycle, whereas the complexes of 2 having a vacant site still can add an unidentate ligand.

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