Abstract
A unique ligand design allows the formation of both an M2 L3 triple helicate and an M4 L6 tetrahedron (M=Ti, Ga; L=ligand based on 2,6-diaminoanthracene). Although the tetrahedron is entropically disfavored, a strong host-guest interaction with Me4 N+ is enough to drive the equilibrium towards the tetrahedron. Remarkably, the helicate can be quantitatively converted into the tetrahedron simply by addition of Me4 N+ (shown schematically).
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