Structural and photophysical properties of mononuclear and dinuclear lanthanide(III) complexes of multidentate podand ligands based on poly(pyrazolyl)borates

Mononuclear and dinuclear lanthanide(III) complexes of multidentate podand ligands based on poly(pyrazolyl)borates are discussed relative to their structural and photophysical properties. Four series of lanthanide complexes of the ligands, all based on bis- or tris(pyrazolylborate) cores, were studied. Photophysical behavior can be rationalized on the basis of structural, electronic, and solvent-induced effects. A wide range of ways to tune absorption and luminescence properties of lanthanide complexes exists.