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The coordination ability of tris(pyridyl)aluminates can be modified by the steric and electronic character of substituents at the 6-positions of their pyridyl rings. Whereas [EtAl(6-Me-2-py) 3 ] - (1) coordinates strongly to lanthanide(ii) ions [Eu(ii) and Yb(ii)], [EtAl(6-Br-2-py) 3 ] - (2) forms much weaker complexes, and [EtAl(6-CF 3 -2-py) 3 ] - does not coordinate at all. The modification of the donor ability of these ligands is investigated by solid-state studies of the Ln(ii) sandwich compounds and by competitive coordination studies in solution.

Modifying the donor properties of tris(pyridyl)aluminates in lanthanide(ii) sandwich compounds