Two complexes of Sm(II) with crown ethers-electrochemical synthesis, structure and spectroscopy

Dalton Transactions : an International Journal of Inorganic Chemistry
Przemysław Starynowicz

Abstract

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.

References

Oct 1, 1989·Physical Review. B, Condensed Matter·A Meijerink, G Blasse
May 31, 2002·Acta Crystallographica. Section B, Structural Science·Frank H Allen

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Citations

May 6, 2010·Dalton Transactions : an International Journal of Inorganic Chemistry·Anja NielandNorbert W Mitzel
Jul 25, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Martin J D ChampionGillian Reid
Feb 9, 2012·The Journal of Physical Chemistry. a·Sandeepan MaityEdamana Prasad
Dec 21, 2006·Angewandte Chemie·Joseph A TeprovichRobert A Flowers
Jan 7, 2021·Journal of the American Chemical Society·Elena MerzlyakovaClaus Feldmann
Jul 14, 2021·Inorganic Chemistry·Nels T AndersonGregory S Girolami
Mar 8, 2019·The Journal of Physical Chemistry. a·Julien Christmann, Hans Hagemann
Jul 11, 2019·Inorganic Chemistry·Matthew L MarshThomas E Albrecht-Schmitt
Feb 23, 2019·Inorganic Chemistry·Frankie D WhiteThomas E Albrecht-Schmitt
Oct 1, 2021·Inorganic Chemistry·Todd N PoeThomas E Albrecht-Schönzart

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