Studies of pendant-arm macrocyclic ligands. Part 5. Synthesis of two pyridine-containing penta-aza macrocycles with single pyrrolidinyl pendant arms and characterisation of their nickel(II) and copper(II) complexes. Crystal structure of perchlorato{7-[2′-(1″-pyrrolidinyl)ethyl]-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1(17),13,15-triene}nickel(II) perchlorate

Abstract

Two new pyridine-containing penta-aza macrocyclic ligands, 7-[2′-(1″-pyrrolidinyl)ethyl]- and 7-[3′-(1″-pyrrolidinyl)propyl]-3,7,11,17-tetra-azabicyclo[11.3.1]heptadeca-1 (17),13,15-triene (L¹ and L² respectively) have been prepared, and their nickel(II) and copper(II) complexes of formulae [M(L¹)(OClO₃)][ClO₄] and [M(HL)][ClO₄]₃(M = Ni or Cu, L = L¹ or L²) have been isolated and characterised. In the octahedral complex [Ni(L¹)(OClO₃)][ClO₄] the presence of a co-ordinated perchlorate group has been established by X-ray crystallography, and the macrocyclic ligand found to co-ordinate close to the corners of a square pyramid with the pendant pyrrolidinyl group at the apical position.