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Heterodinuclear helicate-type complexes are formed from acyl and tosyl hydrazone-substituted catechol ligands. Due to the different geometry of the carboxylate compared to the sulfonate unit, different overall structures are observed for the complexes. The acylate results in the formation of a cylindrical triple-stranded system, while in the tosylate the pendant substituents fold back and form a more condensed structure.

Changing the Overall Shape of Heterodinuclear Helicates via Substitution of Acylhydrazones by Tosylhydrazones