Tuning the optical and magnetic properties of lanthanide single-ion magnets using nitro-functionalized trispyrazolylborate ligands

Nitrated lanthanide trispyrazolylborates, [Ln(4-NO 2 Tp) 3 ], display Ln 3+ luminescence (Ln = Pr, Nd, Sm, Eu, Tb and Dy) while the Nd 3+ analogue is a single-ion magnet under a small applied field.