Steric control of the formation of dinuclear double helicate and dinuclear meso-helicate assemblies
Chemical Communications, 2013•pubs.rsc.org
… Surprisingly, even though the helicate is the simplest of the metallosupramolecular
assemblies and has been known for some time, controlling the formation of the helicate versus
the meso-helicate is still not properly understood. In this paper we describe a ligand which
forms a dinuclear double helicate with Cd 2+ but a dinuclear meso-helicate with both Co 2+ and
Zn 2+ . The difference in structures is attributed to unfavourable steric interactions which prevent
the formation of a helicate with the smaller cobalt and zinc ions. Furthermore, inclusion of …
assemblies and has been known for some time, controlling the formation of the helicate versus
the meso-helicate is still not properly understood. In this paper we describe a ligand which
forms a dinuclear double helicate with Cd 2+ but a dinuclear meso-helicate with both Co 2+ and
Zn 2+ . The difference in structures is attributed to unfavourable steric interactions which prevent
the formation of a helicate with the smaller cobalt and zinc ions. Furthermore, inclusion of …
We describe a ligand system that forms either a dinuclear double helicate or a dinuclear double mesocate dependent upon the size of the metal ion or the steric bulk of the ligand strand.
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