Organometallic Complexes

Sastri, V. S.; Bünzli, Jean‐Claude G.; Rao, V. Ramachandra; Rayudu, G.V.S.; Perumareddi, Jayarama R.

doi:10.1016/b978-044451010-5/50020-1

Cited by 5 publications

(9 citation statements)

References 162 publications

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“…In the lanthanide(III) ions, the 4f valence electrons are shielded behind the 5s and 5p orbitals dampening the effect of crystal field perturbations. 2 Thus, even in low symmetry crystal fields, the splitting of electronic states will be on the order of a few hundred cm À1 . 131 The full 4f energy level diagram of neodymium(III) is shown in Fig.…”

Section: Commonly Observed Transitions In Neodymium(iii) Spectramentioning

confidence: 99%

“…282,283 ''Hypersensitive'' bands can be observed for samarium(III), europium(III), dysprosium(III), holmium(III), erbium(III) and thulium(III). 2 6.3.5 Issue 5: general asymmetry. The difficulty of characterising the molecular structure and thereby assigning properties to a specific neodymium(III) complex poses a significant challenge, as high quality data becomes prone to overinterpretation.…”

Section: Pccp Reviewmentioning

confidence: 99%

“…293 The orbital mixing is always described as weak in f-elements, in particular when compared to the d-block elements. 2 This is a consequence of the limited radial distribution of 4f-orbitals that retract the valence orbitals behind the 5p orbitals of the core shell. Thus, the 4f valence electrons are shielded from the majority of the electric field imposed by coordination environment.…”

Section: F-4f Transition and Selection Rulesmentioning

confidence: 99%

“…Predicted number of observed bands for integer (even number of electrons) and half-integer (odd number of electrons) multiplets, given by the value of J in specific symmetries. Adapted from 'Modern aspects of rare earths and their complexes'2 …”

mentioning

confidence: 99%

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Optical spectroscopy as a tool for studying the solution chemistry of neodymium(iii)

Nawrocki

Sørensen

2023

Phys. Chem. Chem. Phys.

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Section: Commonly Observed Transitions In Neodymium(iii) Spectramentioning

confidence: 99%

Section: Pccp Reviewmentioning

confidence: 99%

Section: F-4f Transition and Selection Rulesmentioning

confidence: 99%

mentioning

confidence: 99%

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Optical spectroscopy as a tool for studying the solution chemistry of neodymium(iii)

Nawrocki

Sørensen

2023

Phys. Chem. Chem. Phys.

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“…This work focuses on the chelation of Eu 3+ by ethylenediaminetetraacetic acid (EDTA) in varying protonation states. Europium is a strong red emitter with characteristic pure emission color at 615 nm, and a key component in a myriad of applications including light emission materials, superconductive alloys, electronic devices, [1–6] as well as in novel biological sensing and imaging techniques [7,8] . Furthermore, the Eu‐EDTA complex has shown the ability to act as a luminescence probe [9–12] .…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Structure of the Eu‐EDTA Complex in Solution at Various Protonation States

Licup,

Summers,

Sobrinho

et al. 2024

Eur J Inorg Chem

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Ethylenediaminetetraacetic acid (EDTA), which has two amine and four carboxylate protonation sites, forms stable complexes with lanthanide ions. This work analyzes the coordination structure, in atomic resolution, of the Eu3+ ion complexed with EDTA in all its protonation states in aqueous solution. Eu‐EDTA complexes were modeled using classical molecular dynamics (MD) simulations using force field parameters optimized with ab initio molecular dynamics (AIMD) simulations. Structures from the MD simulations were used to predict extended X‐ray absorption fine structure (EXAFS) spectra and compared with EXAFS measurements of the Eu3+ aqua ion and Eu‐EDTA complexes at pH 3 and 11. This work details how Eu‐EDTA complex coordination structures change with increasing protonation of the EDTA ligand in the complex, from the tightly bound unprotonated complex to the unbinding of the fully protonated EDTA ligand from the Eu3+ ion as both become solvated by water. Agreement between predicted and measured EXAFS spectra supports the findings from simulation.

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Simultaneous Adsorption of Rare Earth Metal Ions on Chitosan-coated Fumed Silica: Characterization, Kinetics, and Isotherm Studies

Abd Aziz,

Mohd Hir,

Wan Mat Khalir

et al. 2024

Ecol. Eng. Environ. Technol.

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The present study manufactured and utilized the chitosan-coated fumed silica composite (CS@silica) for simultaneous adsorption of rare earth elements (REEs) of Ce(III), La(III), and Nd(III) cations in an aqueous solution. The CS@silica composite underwent characterization using a CHNOS analyzer, Brunauer-Emmett-Teller (BET) surface area analyzer, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectrophotometer, scanning electron microscope coupled with energy-dispersive X-ray (SEM-EDX) spectrophotometer, and X-ray diffraction (XRD) analyzer. The findings indicated that the CS@silica composite exhibited a lack of pores and possessed a specific surface area of 1.27 m 2 /g. Additionally, it was observed that the composite contained a significant amount of oxygen and nitrogen atoms, which serve as the active sites for the adsorption of REEs. The maximum adsorption capacities of Ce(III), La(III), and Nd(III) cations were determined under optimal experimental conditions. These parameters included a pH of 4, an adsorbent dose of 0.01 g, and an equilibrium duration of 20 min. The maximum adsorption capacities for Ce(III), La(III), and Nd(III) cations were found to be 341, 241, and 299 mg/g, respectively. The adsorption kinetics followed the pseudo-second-order kinetic model. The desorption percentage of REEs-loaded CS@silica composite was significantly low when exposed to deionized water and hydrochloric acid (0.01 and 0.02 M). This suggests that there is a chemical interaction between the REEs and the active site on the surface of the composite. The predominant adsorption process proposed was complexation, with ion exchange and electrostatic contact playing a minor role. The CS@silica composite is highly promising for the recovery of REEs because of its rapid adsorption and high adsorption capacities.

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Organometallic Complexes

Cited by 5 publications

References 162 publications

Optical spectroscopy as a tool for studying the solution chemistry of neodymium(iii)

Optical spectroscopy as a tool for studying the solution chemistry of neodymium(iii)

Elucidating the Structure of the Eu‐EDTA Complex in Solution at Various Protonation States

Simultaneous Adsorption of Rare Earth Metal Ions on Chitosan-coated Fumed Silica: Characterization, Kinetics, and Isotherm Studies

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