New gallium(III) and iron(III) endohedral complexes were obtained from a hemicryptophane ligand bearing suitable binding sites for octahedral metal coordination. The solid-state structures of the free host and of the complexes were determined by single-crystal X-ray diffraction analysis. The metal ion is linked to the hydrazone nitrogen and the phenolate oxygen atoms, yielding a distorted octahedral geometry around the encapsulated metal. The two isomorphous structures of the metal complexes reveal the exclusive formation of PΔ/MΛ enantiomeric pairs.
Gosse, I., Robeyns, K., Bougault, C., Martinez, A., Tinant, B., & Dutasta, J.-P. (2016). Synthesis and Structural Studies of Gallium(III) and Iron(III) Hemicryptophane Complexes. Inorganic Chemistry, 55(3), 1011-1013. https://doi.org/10.1021/acs.inorgchem.5b02750 (Original work published 2016)