✦ LIBER ✦
Electron transfer at an encapsulated cobalt(III) centre: kinetics of oxidation of thiourea and 1,1,3,3-tetramethyl-2-thiourea in aqueous acidic media
✍ Scribed by Mobolanle Adegboyega Olatunji; Godwin A. Ayoko; Florence O. Ohiani
- Publisher
- Springer
- Year
- 1994
- Tongue
- English
- Weight
- 352 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0340-4285
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✦ Synopsis
The stoichiometries, kinetics and mechanisms of oxidation of(NH2)2CS (1) and ( Me2N)2CS (2) to the corresponding disulphides by colnM (M ~ W1208o) in aqueous HC104 were investigated. The reaction with (1) follows the empirical rate law --d [-oxidant] = k [-red uctant] [-oxidant]
where k = 12.5 + 0.3 M-a s ~ at 25 ~ C, while that with (2)
where a=5.4x 104M-~s -1 and b=3.3x 106M-2S -~ at 25 ~ Free radicals are important in the reactions and possible reaction mechanisms are suggested and discussed.