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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Harnessing Outer-Sphere Hydrogen Bonding Interactions for Enhancing Ln(III) Selectivity with Alcohol Phase Modifiers.

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Phase modifiers like alcohols enhance lanthanide (Ln) separation by influencing outer-sphere interactions, not inner-sphere coordination. This study reveals how alcohol structure impacts Ln extraction and selectivity in solvent extraction systems.

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Area of Science:

  • Radiochemistry
  • Separation Science
  • Coordination Chemistry

Background:

  • N,N,N',N'-tetraoctyldiglycolamide (TODGA) exhibits high lanthanide (Ln) selectivity.
  • Selectivity is linked to outer-sphere interactions involving TODGA, counteranions, and solvent molecules.
  • Phase modifiers, such as alcohols, can affect Ln extraction but their mechanism is unclear.

Purpose of the Study:

  • Investigate the influence of alcohol structure on Ln extraction by TODGA.
  • Elucidate the mechanism of alcohol interaction in Ln separation.
  • Explore the impact of alcohols on Ln speciation in HNO3 and HCl systems.

Main Methods:

  • Solvent extraction experiments using TODGA in n-dodecane/alcohol mixtures.
  • Spectroscopic analyses including UV-Vis-NIR, TRFS, EXAFS, and NMR.
  • Investigation of lanthanide extraction in nitric acid and hydrochloric acid media.

Main Results:

  • Alcohols significantly enhance Ln selectivity, increasing separation factors.
  • Alcohols associate in the outer sphere, preserving the 1:3 [Ln(TODGA)3]3+ complex.
  • Alcohol alkyl chain structure influences Ln extraction and speciation.

Conclusions:

  • Alcohols act as effective phase modifiers to enhance Ln selectivity in TODGA-based extraction.
  • Outer-sphere interactions with alcohols provide a novel strategy for controlling Ln separation.
  • Understanding alcohol influence is key to optimizing solvent extraction processes for lanthanides.