Anionic lanthanide complexes with 3-methyl-1-phenyl-4-formylpyrazole-5-one and hydroxonium as counter ion

• Published in: Inorganica Chimica Acta Vol. 402; no. 100; pp. 33 - 38
• Main Authors: Shul’gin, Victor F., Konnik, Oleg V., Abkhairova, Susana V., Gusev, Alexey N., Meshkova, Svetlana B., Kiriyak, Anna V., Rusanov, Eduard B., Hasegawa, Miki, Linert, Wolfgang
• Format: Journal Article
• Language: English
• Published: Switzerland Elsevier B.V 01-06-2013; Elsevier Sequoia [etc.]
• Subjects: 4-Formyl-pyrazol-5-one; Crystal structure; Lanthanide complexes; Luminescence; 4-Formyl-pyrazol-5-one; Lanthanide complexes; Luminescence; Crystal structure
• ISSN: 0020-1693; 1873-3255; 0020-1693
• DOI: 10.1016/j.ica.2013.03.044

New lanthanide (Ln) coordination compounds of the composition [H3O][LnL4]·nH2O (n=1–3, Ln=Nd, Sm, Eu, Tb; HL – 3-methyl-1-phenyl-4-formylpyrazol-5-one) with hydroxonium cation as counter were synthesized and investigated by various means, showing the rare case of stronger Sm(III) luminescence compared with an analogues Eu(III) compound. [Display omitted]
•Anionic Ln(III) complexes with 3-methyl-1-phenyl-4-formylpyrazole-5-one.•X-ray crystallographic analysis of Ln(III) complexes.•Ion luminescence of Ln(III) in solid state.•The rare case of stronger Sm(III) luminescence compared with an analogs Eu(III) compound.
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.