Abstract: | It is shown that luminescence quenching of lanthanide (Ln) ions by water molecules (OH-oscillators) entering the first coordination
sphere of a complex decreases as the chain of the fluorinated radical lengthens from CF3 to C6F13. The amounts of water molecules in binary and different-ligand Eu complexes with some fluoro derivatives of acetyl acetone
are determined. It is established that, unlike OH-oscillators, the elimination of hydrogen oscillations at the central carbon
atom by β-diketone deuteration provides the same increase (1.1–1.2 fold) in luminescence intensity in all the investigated
Eu complex compounds.
A. V. Bogatskii Physicotechnical Institute, National Academy of Sciences of Ukraine, 86, Lyustdorfskaya Read, Odessa, 270080,
Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 2, pp. 217–220, March–April, 1997. |