Water Adduct Formation in Extracted Chelates

Burchett, Stuart; Meloan, Clifton E.

doi:10.1080/01496396808053464

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Since TPB - has no ability to transport water as shown above, the value of 0.3 should be allotted to [Fe(phen) 3 ] 2+ . This may be supported by the previous observation, in which [Fe(phen) 3 ] 2+ formed an adduct with as much as 6 water molecules when it was extracted to nitromethane. However, this view was later criticized by Yamamoto et al, who concluded that water was transported exclusively by the anion (e.g.…”

Section: Resultssupporting

confidence: 83%

“…However, this view was later criticized by Yamamoto et al, who concluded that water was transported exclusively by the anion (e.g. ClO 4 - in ref ) and the chelate cation took no part in the transference. On the whole, Yamamoto et al's conclusion is in line with the present result, but the contribution from the chelate cation should not be excluded completely.…”

Section: Resultsmentioning

confidence: 99%

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Hydration of Ions in Organic Solvent and Its Significance in the Gibbs Energy of Ion Transfer between Two Immiscible Liquids

1997

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Various kinds of cations (alkali and alkaline earth metal ions, Me4N+, Et4N+, n-Bu4N+, and tetraphenylarsonium ion) and anions (halide ions, SCN-, ClO4 -, NO3 -, and tetraphenylborate ion) have been extracted from water to nitrobenzene (NB) using several extractants: viz. tetraphenylborate and dipicrylaminate for the cations; n-Bu4N+, n-Pen4N+, n-Hep4N+, and tris(1,10-phenanthroline)iron(II) for the anions. The determination of water content in NB by means of the Karl Fischer method has confirmed that some water molecules are coextracted by hydrophilic inorganic cations and anions. Accurate numbers (n) of the coextracted water molecules per ion have been established. On the basis of these findings, a new model has been proposed for a better understanding of the Gibbs energy of ion transfer at the organic solvent/water interface. If hydrated radii of ions evaluated from n are used, conventional (Born-type) electrostatic solvation models are invalid. A new approach recognizing short-range ion−solvent interactions (e.g. hydrogen bonds) has given a better account of for the hydrated ions.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Hydration of Ions in Organic Solvent and Its Significance in the Gibbs Energy of Ion Transfer between Two Immiscible Liquids

1997

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The Influence of the Dehydration Effect upon the Extraction of Tris(bathophenanthroline) Iron(II) Perchlorate in a Medium Containing Tris(bathophenanthroline) Iron(II) Sulfate

Gregorowicz

Bąkowski

1978

Separation Science and Technology

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Transference of Water to the Nitrobenzene Phase for the Extraction of Tris(1,10-phenanthroline)iron (II) and Tris(2,2′-bipyridine)iron(II) Chelate Salts

Yamamoto¹,

Tarumoto²,

Tarui³

1973

Bulletin of the Chemical Society of Japan

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The amount of water transferred to the nitrobenzene phase was determined for the extraction of ion pairs of tris(1,10-phenanthroline)iron(II) and tris(2,2′-bipyridine) iron(II) with halide and pseudohalide anions. For both chelate systems the smaller the anion, the greater the amount of water transported, very similar results being obtained for a common anion. The results were discussed in relation to water of crystallization, extractability and temperature effect.

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Water Adduct Formation in Extracted Chelates

Cited by 4 publications

References 7 publications

Hydration of Ions in Organic Solvent and Its Significance in the Gibbs Energy of Ion Transfer between Two Immiscible Liquids

Hydration of Ions in Organic Solvent and Its Significance in the Gibbs Energy of Ion Transfer between Two Immiscible Liquids

The Influence of the Dehydration Effect upon the Extraction of Tris(bathophenanthroline) Iron(II) Perchlorate in a Medium Containing Tris(bathophenanthroline) Iron(II) Sulfate

Transference of Water to the Nitrobenzene Phase for the Extraction of Tris(1,10-phenanthroline)iron (II) and Tris(2,2′-bipyridine)iron(II) Chelate Salts

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