A Time-Resolved Study of the Mechanism of the Energy Transfer from a Ligand to the Lanthanide(III)Ion in Solutions and Solid Films

Author(s): Lemmetyinen, H., E. Vuorimaa, A. Jutila, Veli-Matti Mukkala, Harri Takalo, Jouko Kankare

Journal: Luminescence (2000) 15: 341-350.

Abstract:
The photochemical properties of some lanthanide chelates developed for immunohistochemistry have been studied in water and in solid Langmuir–Blodgett films. The fluorescence and triplet-state lifetimes of 4-(phenylethynyl)pyridine (PET), di[(phenylethynyl)pyridine] (D-PET), phenylterpyridine (PTP) and their tetra- or penta-acid derivatives (-TA or -PA) were measured in the presence and absence of Gd(III)-, Tb(III)- and Eu(III)-ions. The mechanism for the total process and the rate constants and quantum yields for the individual reaction steps and for the total process were determined in water solution. Time-resolved absorption and luminescence methods were also used to study the energy transfer between an amphiphilic 4-[4-[(C₁₀H₁₂)₂NCO]phenylethynyl]-pyridine tetra acid (A-PET-TA) and the Tb(III)- and Eu(III)-ions in solid Langmuir–Blodgett films. Luminescence and transient absorption rate constants were determined