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Multifunctionality of the [C2mim][Ln(fod)4] series (Ln = Nd–Tm except Pm): magnetic, luminescence and thermochemical studies.
- Source :
- New Journal of Chemistry; 5/28/2022, Vol. 46 Issue 20, p9858-9870, 13p
- Publication Year :
- 2022
-
Abstract
- A series of nine tetrakis lanthanide β-diketonate complexes of the type [C<subscript>2</subscript>mim][Ln(fod)<subscript>4</subscript>] (C<subscript>2</subscript>mim = 1-ethyl-3-methylimidazolium, fod = 6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionate) were prepared, with yields above 80%, and their thermochemical, photophysical and magnetic susceptibilities were evaluated. Thermochemical studies presented a rare and reversible conversion between two solid phases (polymorphism), characteristic of the [Ln(fod)<subscript>4</subscript>]<superscript>−</superscript> anion. Photophysical and magnetic studies revealed that Dy and Er presented the multifunctionality of being simultaneously SMMs and visible (Dy) or near infra-red (Er) emitters. The Nd, Ho and Tm analogues present characteristic emission bands in the NIR region (800–1200 nm), while Sm, Eu, Tb and Dy present emissions in the visible range. Magnetic susceptibility of Tb, Dy, Ho, Er and Tm salts were measured in the temperature range of 2–300 K, showing paramagnetic behaviour, although with different regimes, with AC susceptibility measurements, at different frequencies in the range of 10–10 000 Hz, providing evidence of slow magnetic relaxation processes for Gd, Dy and Er analogues with SMM behavior. [ABSTRACT FROM AUTHOR]
- Subjects :
- TERBIUM
MAGNETIC susceptibility
MAGNETIC relaxation
LUMINESCENCE
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 46
- Issue :
- 20
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 157033976
- Full Text :
- https://doi.org/10.1039/d2nj01415g