Dinesh C. BILEHAL, Raviraj M. KULKARNI, Sharanappa T. NANDIBEWOOR

7980

Kinetics of Oxidation of Pyridylmethylsulphinylbenzimidazole by Cerium(IV) in an Aqueous Perchloric Acid Medium

The kinetics of oxidation of pyridylmethylsulphinylbenzimidazole [PMSB] by Ce(IV) in an aqueous perchloric acid medium at a constant ionic strength of 1.50 mol dm-3 were studied spectrophotometrically. The reaction showed first order kinetics with respect to Ce(IV) concentration and an apparent less than unit order dependence in [PMSB] and a zero order in [H+]. The initial addition of products has no significant effect on the rate of the reaction. A possible mechanism is proposed here. The reaction constants involved in the mechanism have been computed. There is good agreement between the observed and calculated rate constants under different experimental conditions. The activation parameters were calculated and discussed with respect to the slow step of the proposed mechanism.
Anahtar Kelimeler:

Pyridylmethylsuphinylbenzimidazole, Cerium(IV), Oxidation, Kinetics

Kinetics of Oxidation of Pyridylmethylsulphinylbenzimidazole by Cerium(IV) in an Aqueous Perchloric Acid Medium

The kinetics of oxidation of pyridylmethylsulphinylbenzimidazole [PMSB] by Ce(IV) in an aqueous perchloric acid medium at a constant ionic strength of 1.50 mol dm-3 were studied spectrophotometrically. The reaction showed first order kinetics with respect to Ce(IV) concentration and an apparent less than unit order dependence in [PMSB] and a zero order in [H+]. The initial addition of products has no significant effect on the rate of the reaction. A possible mechanism is proposed here. The reaction constants involved in the mechanism have been computed. There is good agreement between the observed and calculated rate constants under different experimental conditions. The activation parameters were calculated and discussed with respect to the slow step of the proposed mechanism.
Keywords:

Pyridylmethylsuphinylbenzimidazole, Cerium(IV), Oxidation, Kinetics,

PDF
Turkish Journal of Chemistry-Cover
  • ISSN: 1300-0527
  • Yayın Aralığı: 6
  • Yayıncı: TÜBİTAK
Arşiv
Sayıdaki Diğer Makaleler

Application of IBX Method for the Synthesis of Ketones from Carboxylic Acids

H. R. Ferhat KARABULUT, Mesut KAÇAN

Investigation of the Surface Acidity of a Bentonite Modified by Acid Activation and Thermal Treatment

Tülay ALEMDAROĞLU, Gülcan AKKUŞ

Potentiometric and Spectroscopic Studies with Chromium(III) Complexes of Hydroxysalicylic Acid Derivatives in Aqueous Solution

M. Suat AKSOY, Ulviye ÖZER

Application of Potassium Chromate-Diphenylcarbazide in the Quantitative Determination of Ascorbic Acid by Spectrophotometry

Meissam NOROOZIFAR, Mozhgan KHORASANI-MOTLAGH

Neolignan, Flavonoid, Phenylethanoid and Iridoid Glycosides from Phlomis integrifolia

İclal SARACOĞLU, Mehtap VAREL, İhsan ÇALIŞ

Kinetics of Oxidation of Pyridylmethylsulphinylbenzimidazole by Cerium(IV) in an Aqueous Perchloric Acid Medium

Dinesh C. BILEHAL, Raviraj M. KULKARNI, Sharanappa T. NANDIBEWOOR

Isolation and Characterization of a Smectite as a Micro-Mesoporous Material from a Bentonite

Müşerref ÖNAL, Yüksel SARIKAYA, Tülay ALEMDAROĞLU, İhsan BOZDOĞAN

Phenolic, Megastigmane, Nucleotide, Acetophenon and Monoterpene Glycosides from Phlomis samia and P. carica

Funda Nuray YALÇIN, Tayfun ERSÖZ, Pınar AKBAY

Plasticiser effect on water vapour permeability properties of locust bean gum-based edible films

Özgür Altan BOZDEMİR, Mehmet TUTAŞ

Plasticiser Effect on Water Vapour Permeability Properties of Locust bean gum--Based Edible Films

Özgür Altan BOZDEMİR, Mehmet TUTAŞ