Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 452, Issue -, Pages 148-153Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.03.092
Keywords
Cosolvents; Sodium dodecyl sulfate; CMC; tris(2,2'-bipyridine)iron(II) complex; Alkaline hydrolysis
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Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi [09/096(0564)/2008-EMR-I]
- University Grants Commission (UGC), New Delhi [19-06/2011(i)EU-IV]
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The kinetics of alkaline hydrolysis of tris(2,2'-bipyridine)iron(II) complex have been studied in the presence of various alcohols of different chain lengths and number of OH groups in aqueous and SOS micellar medium. In aqueous medium, rate increases at all percentages of 1-alkanols in the following order: PrOH > EtOH > MeOH > H2O, whereas the effectiveness of glycols as inhibitors is in the following order: Gly > EG > PG > H2O. Hence PrOH has the most pronounced effect as accelerator and Gly as inhibitor on rate. In the presence of SOS micelles, rate has been inhibited because of binding of SDS with substrate, but the presence of alcohols reduces this inhibitory effect of SDS. All these results have been explained in terms of the CMC, micellar size and properties of SOS in these cosolvents, H-bonding capacity of solvents, dielectric constants of the media, etc. (C) 2014 Elsevier B.V. All rights reserved.
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