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Two complexes of Sm(II) with crown ethers-electrochemical synthesis, structure and spectroscopy.
Autorzy
Rok wydania
2004
Czasopismo
Strony
825-832
DOI
10.1039/B316253B
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Two complexes of divalent samarium have been synthesized by electrochemical reduction in methanol–tetrahydrofuran solutions: [Sm(18-crown-6)(ClO4)2] and [Sm(15-crown-5)2](ClO4)2. In [Sm(18-crown-6)(ClO4)2] the metal cation is ten-coordinate and its coordination sphere comprises six oxygen atoms of the crown ligand and four oxygen atoms from two perchlorate anions. [Sm(15-crown-5)2](ClO4)2 shows a sandwich structure with decacoordinate samarium located between two 15-crown-5 molecules. At 77 K both compounds show f–f luminescence originating from the 5D0 level, and also the 15-crown-5 complex shows a weak luminescence in the range 20000–25000 cm−1, which has been tentatively interpreted as originating from 3P0 and 5H3 levels. At room temperature the emission of [Sm(15-crown-5)2](ClO4)2 is dominated by broad f–d bands. In the excitation spectra some Fano resonances have been observed. The 18-crown-6 compound is unstable, but the 15-crown-5 compound is fairly stable in air.
Adres publiczny
https://doi.org/10.1039/B316253B
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