Three rare-earth incorporating 6-peroxotantalo-4-selenates and catalytic activities for imidation reaction.
Dalton Trans
; 51(26): 9988-9993, 2022 Jul 05.
Article
em En
| MEDLINE
| ID: mdl-35678129
ABSTRACT
Functionalization with belt lanthanide groups allows for the crystallization and structural characterization of homometallic selenotantalates, CsK[Ln(H2O)6Se4(TaO2)6(OH)3O18]·nH2O (Ln = Eu/Gd, n = 14 (STD-Eu, STD-Gd) and Ln = Lu, n = 12 (STD-Lu)). The basket-shaped {Se4(TaO2)6} archetype is assembled in a simple one-pot reaction of Na2SeO3 and K8[Ta6O19]·17H2O in acidic aqueous medium (pH 2) and in the presence of hydrogen peroxide. This unit has been proven to be an effective precursor for the preparation of a range of new POMs containing the {Se4(TaO2)6} unit. The lanthanide derivatives STD-Eu, STD-Gd and STD-Lu have been fully characterized with single-crystal X-ray diffraction, IR spectroscopy, TG analysis and PXRD in the solid state. The photoluminescence and lifetime decay behaviours of STD-Eu have been studied at room temperature, and the photoluminescence spectrum displays the characteristic emission of the Eu3+ cation. In addition, the catalytic activities of STD-Eu, STD-Gd and STD-Lu on the reaction of phthalic anhydride with phenylamines have been investigated. STD-Eu shows good catalytic activities for imidation reactions.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Infecções Sexualmente Transmissíveis
/
Elementos da Série dos Lantanídeos
/
Metais Terras Raras
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article