STUDIES OF PENDANT-ARM MACROCYCLIC LIGANDS. PART 4. TWO PENTA-AZA MACROCYCLES BASED ON 1-(2'-DIMETHYLAMINOETHYL)-1,5,9,13-TETRA-AZACYCLOHEXADECANE AND ITS COMPLEXES WITH BIVALENT METAL IONS

Article abstract of DOI:10.1039/DT9850001361

Two new pendant-arm sixteen-membered ring penta-aza macrocycles, 1-(2'-dimethylaminoethyl)-1,5,9,13-tetra-azacyclohexadecane (L¹) and 1-(2'-dimethylaminoethyl)-5,9,13-trimethyl-1,5,9,13-tetra-azacyclohexadecane (L²) have been prepared and the complexes of L¹ with Ni²⁺, Cu²⁺, Co²⁺, Zn²⁺, Cd²⁺, and Hg²⁺, investigated.The ions Ni²⁺, Cu²⁺, and Co²⁺ form high-spin five-co-ordinnate complexes.Carbon-13 n.m.r. spectroscopy shows 1)>2 to be a 1:1 mixture of two species, one symmetric and the other asymmetric, and 1)>2 is analogous but with evidence of a small amount of a third species.Attempts to prepare 1)>²⁺ have led to its immediate reduction to metallic mercury.

Full text of DOI:10.1039/DT9850001361

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