Electron paramagnetic resonance of lanthanides

Light- and Chemical-Doping-Induced Magnetic Behavior of Eu Molecular Systems

“…The EPR spectrum has weak temperature dependence in the 4–77 K range (Figure S2) due to the slow spin relaxation of Eu 2+ Kramer ions with fully occupied half-filled 4f orbitals. The first excited state of Eu half-filled 4f orbitals is at higher energy than other lanthanides, thereby enabling the observation of their EPR features even at room temperature . EPR spectra were successfully simulated with the axially symmetric signal with Lande g -factor g ⊥ = 2.001 and g ∥ = 1.994 for Eu(dipic) 3 considering natural abundance of Eu isotopes of 48% 151 Eu and 52% 153 Eu, both with nuclear spin 5/2.…”

“…The first excited state of Eu half-filled 4f orbitals is at higher energy than other lanthanides, thereby enabling the observation of their EPR features even at room temperature. 34 EPR spectra were successfully simulated with the axially symmetric signal with Lande g-factor g ⊥ = 2.001 and g ∥ = 1.994 for Eu(dipic) 3 considering natural abundance of Eu isotopes of 48% 151 Eu and 52% 153 Eu, both with nuclear spin 5/2. At the wings of the spectrum, one can recognize the outermost lines of 151 Eu hyperfine sextet (shown in blue in the simulation in Figure 2b) since its nuclear hyperfine constant is 2.27 times larger than that of 153 Eu (shown in magenta in Figure 2b).…”

Synthesis, solid-state, solution, and theoretical characterization of an “in-cage” scandium-NOTA complex

“…Recent advances in inorganic chemistry have supported development of a wide range of technologies based on rareearth elements (Sc, Y, La, and lanthanides). [1][2][3][4][5][6] This application space spans from superconducting materials and paramagnets [7][8][9] to luminescent technologies [10][11][12] as well as radiotherapeutics and radiodiagnostics. [13][14][15][16][17][18][19][20][21][22][23][24] To advance the stateof-the-art in the aforementioned rare earth technologies, there is need to develop a better understanding of rare-earth element chemistry, in general.…”

Fast Screening of Coal Fly Ash with Potential for Rare Earth Element Recovery by Electron Paramagnetic Resonance Spectroscopy

“…REYs are typical paramagnetic species, which could also be studied by using EPR spectroscopy. 23,24 As Ca(II) is abundant in CFA 25 and because isomorphous or even incomplete isomorphous replacement often occurs among Ca(II), Mn(II), and REY(III) (the major form of REYs in CFA 26 ) due to their similar ionic radii, 27 EPR spectroscopy can be used to study Mn(II) and REY(III) in CFAs.…”

“…Similarly, in materials science, the source of marble (a Ca-dominant rock) can be determined by comparing the EPR spectra of Mn­(II) in samples from various quarries. REYs are typical paramagnetic species, which could also be studied by using EPR spectroscopy. , As Ca­(II) is abundant in CFA and because isomorphous or even incomplete isomorphous replacement often occurs among Ca­(II), Mn­(II), and REY­(III) (the major form of REYs in CFA) due to their similar ionic radii, EPR spectroscopy can be used to study Mn­(II) and REY­(III) in CFAs.…”