Insight into geometric preferences in uranium(VI) mixed tris(imido) systems.

Uranium tris(imido) species have been synthesized using different imido groups in the axial and equatorial positions by treating [(MesPDIMe)U(THF)]2 (1-THF), which is a uranium(iv) dimer that is supported by MesPDIMe tetraanions, with mixed organoazide solutions. While the origin of the geometric preference isn't clear, both steric and electronic factors are likely at play.

A reduction series of neodymium supported by pyridine(diimine) ligands.

The synthesis of a redox series of neodymium species bearing the redox active pyridine(diimine) ligand, MesPDIMe, is reported. Spectroscopic and structural characterization supports each compound has a Nd(iii) centre, with the MesPDIMe ligand existing in four oxidation states.