Interaction of TbCl3 and lanthanide complexes with poly（N-vinylpyrrolidone）

The interaction of TbCl3 and lanthanide(III) β-diketonate complexes with poly(N-vinylpyrrolidone)(PVP) polymer was studied using fluorescence spectroscopy. In the presence of PVP the emission of Tb3+ in ethanolic solution of TbCl3 significantly increased owing to the excitation energy transfer from PVP to Tb3+ ions, which was more efficient as compared to a direct excitation of the Tb3+ 4f75d1 levels. In contrast, emission of NEt4Tb(hfa)4 and NEt4Eu(hfa)4 complexes was almost completely quenched in solution containing PVP. The PVP bound both Ln3+ ions and hfa ligands which caused decomposition of Ln-hfa complexes and switched off the excitation energy transfer from the ligand to the emitting Ln3+ ion. The important role of hydrogen bonds in stabilization of interaction of hfa ligands with PVP was indicated.

Interaction of TbCl3 and lanthanide complexes with poly（N-vinylpyrrolidone）

The interaction of TbCl₃ and lanthanide(III) β-diketonate complexes with poly(N-vinylpyrrolidone) (PVP) polymer was studied using fluorescence spectroscopy. In the presence of PVP the emission of Tb³⁺ in ethanolic solution of TbCl₃ significantly increased owing to the excitation energy transfer from PVP to Tb³⁺ ions, which was more efficient as compared to a direct excitation of the Tb³⁺ 4f⁷5d¹ levels. In contrast, emission of NEt₄Tb(hfa)₄ and NEt₄Eu(hfa)₄ complexes was almost completely quenched in solution containing PVP. The PVP bound both Ln³⁺ ions and hfa ligands which caused decomposition of Ln-hfa complexes and switched off the excitation energy transfer from the ligand to the emitting Ln³⁺ ion. The important role of hydrogen bonds in stabilization of interaction of hfa ligands with PVP was indicated.