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pH-Controlled Assembly of Two Polynuclear Dy(III)-Containing Polytungstoarsenates with Magnetic and Luminescence Properties.
Xiong, Jia; Yang, Zeng-Xi; Ma, Pengtao; Lin, Dunmin; Zheng, Qiaoji; Huo, Yu.
Afiliação
  • Xiong J; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, People's Republic of China.
  • Yang ZX; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, People's Republic of China.
  • Ma P; Henan Key Laboratory of Polyoxometalate Chemistry, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, People's Republic of China.
  • Lin D; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, People's Republic of China.
  • Zheng Q; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, People's Republic of China.
  • Huo Y; College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, People's Republic of China.
Inorg Chem ; 60(10): 7519-7526, 2021 May 17.
Article em En | MEDLINE | ID: mdl-33891402
Two novel polynuclear dysprosium (Dy)-containing polytungstoarsenates, CsK7Na16[(AsW9O33)6Dy6W10O24(H2O)23]·40H2O (1) and Cs2K18Na18[(AsW9O33)7Dy7W8O21(H2O)17(µ3-OH)(OH)]·78H2O (2), have been synthesized via the reaction of the preformed polyoxometalate (POM) precursor [As2W19O67(H2O)]14- and Dy3+ ions through controlling pH. The polyanion of 1 can be described as a dimer of two similar trimers {(AsW9O33)3Dy2W5O12(H2O)6} that are linked by Dy cation and two µ2-oxo groups, and the Dy(III) ions in 1 are arranged in a linear fashion. Compound 2 presenting an interesting W-shaped structure, assembly composed of a dimeric {(AsW9O33)2W3Dy2O8(H2O)7}, a trimer {(AsW9O33)3W4Dy2O11(OH)(H2O)3}, and a particular sandwiched {(AsW9O33)2WDy3O4(µ3-OH)(H2O)7} segment concatenated by µ2-oxo groups. The solid-state luminescence performances and lifetime decay behaviors of 1 and 2 were systematically researched at ambient temperature, and time-resolved fluorescence spectra of 1 and 2 indicate energy transfer (ET) from the photoexcitation O → M ligand to the metal charge-transfer (LMCT) bands of the POM ligands to Dy3+ ions. Moreover, the dynamic magnetic measurement indicates that 1 and 2 exhibit slow relaxation of the magnetization.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Inorg Chem Ano de publicação: 2021 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Inorg Chem Ano de publicação: 2021 Tipo de documento: Article