Investigation of Electron Transfer Reaction Between Diphenylbenzidine and Ascorbic Acid

Iftikhar Imam NAQVI; Abida PERVEEN

Makale detayları

Investigation of Electron Transfer Reaction Between Diphenylbenzidine and Ascorbic Acid

Yazarlar:

Iftikhar Imam NAQVI | Abida PERVEEN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2005 Vol.29 Issue 6, pp.627-634

Belge Tipi:

Makale

Yayın Tarihi:

5/2005

Belge Dili:

Türkçe

Document ID (Org No.):

2000728996

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527

Özet:

 

The kinetics of the reduction of diphenylbenzidine by  ascorbic acid were investigated in the pH range 3.5 to 5.0.   Diphenylbenzidine was prepared by the oxidation of diphenylamine with  cerium(IV) sulfate tetra hydrate.  The order of the reaction with  respect to each of the reactants, i.e ascorbic acid (ASC),  diphenylbenzidine (DPB) and H+ ,was found to be first.    The following rate law is recommended:    Rate = {k1 [C12H10N2C12H10] + k2K   [C12H10N2C12H10][H+]}[C6H8O6]    where k1 and k2 have the values of 2.0 \times 104 dm3mol-1  s-1 and 6.58 \times 103 dm3.mol-1.s-1 , respectively.  K is  the protonation constant of DPB, having a value of 476 dm3 mol-1.   A possible mechanism for the reaction is also proposed.

 

The kinetics of the reduction of diphenylbenzidine by  ascorbic acid were investigated in the pH range 3.5 to 5.0.   Diphenylbenzidine was prepared by the oxidation of diphenylamine with  cerium(IV) sulfate tetra hydrate.  The order of the reaction with  respect to each of the reactants, i.e ascorbic acid (ASC),  diphenylbenzidine (DPB) and H+ ,was found to be first.    The following rate law is recommended:    Rate = {k1 [C12H10N2C12H10] + k2K   [C12H10N2C12H10][H+]}[C6H8O6]    where k1 and k2 have the values of 2.0 \times 104 dm3mol-1  s-1 and 6.58 \times 103 dm3.mol-1.s-1 , respectively.  K is  the protonation constant of DPB, having a value of 476 dm3 mol-1.   A possible mechanism for the reaction is also proposed.

Makale detayları

Investigation of Electron Transfer Reaction Between Diphenylbenzidine and Ascorbic Acid

Yazarlar: Iftikhar Imam NAQVI | Abida PERVEEN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Chemistry 2005 Vol.29 Issue 6, pp.627-634

Belge Tipi: Makale

Yayın Tarihi: 5/2005

Belge Dili: Türkçe

Document ID (Org No.): 2000728996

Sıklık: İki Aylık

eISSN: 1303-6130

pISSN: 1300-0527

Sayı

Yazarlar:

Iftikhar Imam NAQVI | Abida PERVEEN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Chemistry 2005 Vol.29 Issue 6, pp.627-634

Belge Tipi:

Makale

Yayın Tarihi:

5/2005

Belge Dili:

Türkçe

Document ID (Org No.):

2000728996

Sıklık:

İki Aylık

eISSN:

1303-6130

pISSN:

1300-0527