f energy transfer, as a result of the short metal-metal separation across the bipyrimidine bridge. In a CH2CI2 solution, partial dissociation of the dinuclear complexes into the mononuclear units occurs, with the result that some (MLCT)-M-3 luminescence is observed from mononuclear [Re(bpym)(CO)(3)Cl] or [Pt(bpym)(CC-C6H4CF3)(2)] present in the equilibrium mixture. Solution UV-vis and luminescence titrations, carried out by the addition of portions of Ln(fod)(3)(H2O)(2) or Ln(hfaC)(3)(H2O)(2) to the d-block complex ligands, indicate that binding of the lanthanide tris(1,3-diketonate) unit at the secondary bipyrimidine site to give the d-f dinuclear complexes occurs with an association constant of ca. 10(5) M-1.. Subjects: near-infrared luminescence" />
Syntheses and crystal structures of dinuclear complexes containing d-block and f-block luminophores. Sensitization of NIR luminescence from Yb(III), Nd(III), and Er(III) centers by energy transfer from Re(I)and Pt(II)-bipyrimidine metal centers