Extraction of Se(<scp>iv</scp>) and Se(<scp>vi</scp>) from aqueous HCl solution by using a diamide-containing tertiary amine

Narita, Hirokazu; Maeda, Motoki; Tokoro, Chiharu; Suzuki, Tomoya; Tanaka, Mikiya; Shiwaku, Hideaki; Yaita, Tsuyoshi

doi:10.1039/d3ra01341c

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…The nature and scope of weak chemical bonds has become a major focus of research in recent years [13]. Chloroselenites are currently of interest in relation to the speciation and extraction of Se(IV) and Se(VI) for environmental concerns [14]. The electron affinities of SeO n clusters have been evaluated for similar motivations [15] and fundamental spectroscopy on SeO 2 rotational lines remain of interest for astronomic detection [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Bonds Stabilize Chloroselenite Anions: Crystal Structure of a New Salt and Donor-Acceptor Bonding to SeO2

Boeré

2023

Molecules

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The single-crystal X-ray diffraction structure characterizing a new 4-methylbenzamidinium salt of chloroselenite [C8H11N2][ClSeO2] is reported. This is only the second crystal structure report on a ClSeO2− salt. The structure contains an extended planar hydrogen bond net, including a double interaction with both O atoms of the anion (an R228 ring in Etter notation). The anion has the shortest Se–Cl distances on record for any chloroselenite ion, 2.3202(9) Å. However, the two Se–O distances are distinct at 1.629(2) and 1.645(2) Å, attributed to weak anion–anion bridging involving the oxygen with the longer bond. DFT computations at the RB3PW91-D3/aug-CC-pVTZ level of theory reproduce the short Se–Cl distance in a gas-phase optimized ion pair, but free optimization of ClSeO2− leads to an elongation of this bond. A good match to a known value for [Me4N][ClSeO2] is found, which fits to the Raman spectroscopic evidence for this long-known salt and to data measured on solutions of the anion in CH3CN. The assignment of the experimental Raman spectrum was corrected by means of the DFT-computed vibrational spectrum, confirming the strong mixing of the symmetry coordinate of the Se–Cl stretch with both ν2 and ν4 modes.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Bonds Stabilize Chloroselenite Anions: Crystal Structure of a New Salt and Donor-Acceptor Bonding to SeO2

Boeré

2023

Molecules

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Solvent extraction of selenium in nitric acid: evaluation of multiple extractants and proposal of a novel separation process

Ito,

Kawakami,

Kato

et al. 2024

J Radioanal Nucl Chem

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Performance and mechanism of siderite/zero-valent nickel composite material for removing Se(IV) from solution

Du,

Zhou,

Zhao

et al. 2024

Journal of Solid State Chemistry

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Extraction of Se(iv) and Se(vi) from aqueous HCl solution by using a diamide-containing tertiary amine

Abstract: A protonated diamide containing tertiary amine (EHBAA) can extract Se(iv) and Se(vi) from HCl via solvation and anion-exchange reactions, respectively.

Cited by 4 publications

References 34 publications

Hydrogen Bonds Stabilize Chloroselenite Anions: Crystal Structure of a New Salt and Donor-Acceptor Bonding to SeO2

Hydrogen Bonds Stabilize Chloroselenite Anions: Crystal Structure of a New Salt and Donor-Acceptor Bonding to SeO2

Solvent extraction of selenium in nitric acid: evaluation of multiple extractants and proposal of a novel separation process

Performance and mechanism of siderite/zero-valent nickel composite material for removing Se(IV) from solution

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