Electrochemistry and electrocatalysis with vitamin B sub 12 in an AOT water-in-oil microemulsion

Journal Article · Wed Jul 05 04:00:00 EDT 1989 · Journal of the American Chemical Society; (USA)

DOI:https://doi.org/10.1021/ja00196a011· OSTI ID:6903156

Owlia, Azita; Wang, Zhenghao; Rusling, J F ^[1]

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1. Univ. of Connecticut, Storrs (USA)

Vitamin B{sub 12a} solubilized in water pools of highly resistive water-in-oil (w/o) microemulsions of 0.2 M Aerosol OT (AOT, bis(2-ethylhexyl) sulfosuccinate)/4 M water/isooctane gave separate reductions of base-on cob(III)alamine to base-on cob(II)alamine (E{sub 1/2} = {minus}0.03 V vs SCE) and base-on cob(II)alamine to base-off cob(I)alamine (E{sub 1/2} = {minus} 0.87 V). Diffusion coefficients suggested that vitamin B{sub 12} induces the formation of surfactant aggregates in w/o microemulsions that are larger than in solute-free systems. Relative reactivities toward reductions of three oil-soluble alkyl vicinal dihalides by electrochemically generated cob(I) alamine were modified in the microemulsion compared to isotropic water-acetonitrile. Changes in relative reactivity are not explained by simple partition of vicinal dibromides between isooctane and water and suggest specific interactions with surfactant aggregates or significant reaction in the bulk isooctane phase.

• OSTI ID: 6903156
• Journal Information: Journal of the American Chemical Society; (USA), Journal Name: Journal of the American Chemical Society; (USA) Vol. 111:14; ISSN 0002-7863; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000* -- Chemistry
400201 -- Chemical & Physicochemical Properties
CATALYSTS
CHEMISTRY
COBALT
COLLOIDS
DATA
DATA ANALYSIS
DISPERSIONS
DRUGS
ELECTROCATALYSTS
ELECTROCHEMISTRY
ELEMENTS
EMULSIONS
EXPERIMENTAL DATA
HEMATINICS
HEMATOLOGIC AGENTS
HYDROCARBONS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METALS
MICROEMULSIONS
NUMERICAL DATA
ORGANIC COMPOUNDS
TRANSITION ELEMENTS
VITAMIN B GROUP
VITAMIN B-12
VITAMINS