Multifunctional Dy(3+) Complexes with Triphenylmethanolates: Structural Diversity, Luminescence, and Magnetic Relaxation.

The coordination environment of magneto-luminescent Dy(3+)-based Single-Molecule Magnets (SMM) is a crucial factor influencing both magnetic and luminescent properties. In this work, we explore how triphenylmethanolate (Ph(3)CO(-)), in combination with other ligands, can modulate the structure and, therefore, the magnetic properties of Dy(3+)-based SMM. Using triphenylmethanolate in combination with THF and pyridine (Py) as co-ligands, we synthesized a series of mononuclear cis-[Dy(OCPh(3))(2)(THF)(4)][BPh(4)]·(2,6-Me(2)C(5)H(3)N) (1), trans-Dy(OCPh(3))(3)(THF)(2) (2), fac-Dy(OCPh(3))(3)(py)(3) (3) and dinuclear [(Ph(3)CO)Dy(THF){(μ(2)-Cl)(2)Li(THF)(2)}μ(2)-Cl](2) (4) complexes where the Dy(3+) ion presents five- or six-coordinate geometries. Dinuclear compound 4 exhibits a genuine SMM behavior with a relatively high energy barrier of 421 cm(-1), while mononuclear complexes 1-3 are field-induced SMM. These complexes also present Dy(3+)-characteristic luminescence, highlighting their multifunctional character.