A spectroscopic study of erbium(III) acetate and haloacetates utilizing judd-ofelt intensity parameters and NMR chemical shifts

Mullica, D. F.; Wilson, G.A.; Lok, C. K. C.

doi:10.1016/s0020-1693(00)83443-x

Cited by 1 publication

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“…Certain f-elements including Nd, Ho, and Eu exhibit hypersensitive transitions that are more influenced by the ligand environment than predicted solely by crystal field effects. 17,42,43 The increased sensitivity to the immediate coordination environment of the neodymium(III) ion in its anionic complex was used to observe changes between spectra that may have been too faint to observe in the d−d transitions of Mn II . For Nd III , the 2 G 7/2 ← 4 I 9/2 transition and overlapping 4 G 5/2 ← 4 I 9/2 hypersensitive transition are often used to characterize its coordination environment.…”

Section: Optical Measurements Of Manganese(ii) and Neodymium(iii)mentioning

confidence: 99%

Room-Temperature Ionic Liquid Cation Effects on the Structure and Stability of Anionic Lanthanide Complexes

Unger

Jensen

2023

Inorg. Chem.

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Room-temperature ionic liquids (RTILs) are a subset of molten salts that are liquids at room temperature and may offer an elegant, low-temperature route to predicting the properties of solvated metal complexes in their high-temperature analogues. This work studied the chemistry of chloride anion-containing RTILs to determine their similarity to inorganic molten chloride salts. The behaviors of complexes of Mn, Nd, and Eu were evaluated in a variety of chloride RTILs by absorption spectrophotometry and electrochemistry to elucidate trends in cation effects on the coordination geometry and redox properties of the solvated species. Spectrophotometric data indicated the metals are present as anionic complex (e.g., MnCl 42− and NdCl 6 3−) analogous to those observed in molten chloride salts. Strongly polarizing, charge-dense RTIL cations induced distortions to the symmetry of these complexes, resulting in lower oscillator strengths and red-shifted energies for the observed transitions. Cyclic voltammetry experiments were used to characterize the Eu(III/II) redox couple producing diffusion coefficients on the order of 10 −8 cm 2 s −1 and heterogeneous electron transfer rate constants ranging between 6 × 10 −5 and 2 × 10 −4 cm s −1 . The E 1/2 potentials for Eu(III/II) were also found to shift positively with increasing cation polarization power, stabilizing the Eu(II) oxidation state by removing electron density from the metal center over chloride bond networks. Both the optical spectrophotometry and electrochemistry results suggest that the polarization strength of an RTIL cation plays a major role in the geometry and stability of a metal complex.

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Section: Optical Measurements Of Manganese(ii) and Neodymium(iii)mentioning

confidence: 99%