Author/Authors :
Shul’gin، نويسنده , , Victor F. and Konnik، نويسنده , , Oleg V. and Abkhairova، نويسنده , , Susana V. and Gusev، نويسنده , , Alexey N. and Meshkova، نويسنده , , Svetlana B. and Kiriyak، نويسنده , , Anna V. and Rusanov، نويسنده , , Eduard B. and Hasegawa، نويسنده , , Miki and Linert، نويسنده , , Wolfgang، نويسنده ,
Abstract :
A series of [H3O]+[LnL4]−·nH2O complexes (n = 1–3, Ln = Nd, (1), Sm (2), Eu (3), Tb (4); HL = 3-methyl-1-phenyl-4-formylpyrazole-5-one) were synthesized and characterized. The structures of the SmIII and EuIII complexes were investigated by X-ray diffraction. The isostructutal crystalls 2 and 3 consist the tetrakis [LnL4]− anions which are linked by H-bonding with the hydroxonium counter-ion and water molecules. The lanthanide ion is situated in the center of distorted tetragonal antiprism formed by eight oxygen atoms of 4-formyl-5-hydroxypyrazolonate anions. The TbIII and SmIII complexes show strong luminescence in solid state, whereas the EuIII and NdIII complexes show low luminescence activity.
Keywords :
4-Formyl-pyrazol-5-one , crystal structure , Luminescence , Lanthanide complexes
