Abstract

A 1 : 1 mixture of the homoleptic double helicates [MII(L1)2] and [MII(L2)2] [M = Cu, Zn; (L1)2− and (L2)2− are bis-bidentate ligands containing two pyrazolyl-phenolate termini but with different spacers separating them] affords the mixed ligand complexes [M(L1)(L2)] in high yield, indicative of a favourable inter-ligand interaction in the mixed-ligand complexes. Whereas [Cu(L1)(L2)] is a double helicate, [Zn(L1)(L2)] is a mesocate with a ‘face to face’ arrangement of the two ligands.

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