Preparation and Characterization of Highly Transparent
Conducting Composites of Acid-doped Poly(o-toluidine) and
Poly(methylmethaacrylate)

Research Abstract
NULL
Research Authors
Rahul C. Patil , Seddique. M. Ahmed, and Kotaro Ogura
Research Department
Department of chemistry
Research Journal
Polymer Journal,
Research Member
Seddique Mahmoud Ahmed Farag
Research Pages
5
Research Publisher
NULL
Research Rank
1
Research Vol
32(6) (2000) 466-470.
Research Website
NULL
Research Year
2000

Spectrophotometric Study of Acid-Base
Equilibria of 4-(2-Benzothiazolylazo)resorcinol
and 4-(2-Benzothiazolylazo)salicylic Acid in
Water-Organic Solvent Media

Research Abstract
The visible absorption spectra of 4-(2-benzothiazolylazo)resorcinol (BTAR) and 4-(2-benzothiazolylazo)salicylic acid (BTAS) have been recorded in water- organic solvent mixtures in the pH range 0_5-12.0. The organic solvents used are methanol, ethanol, n-propanot, iso-propanol, acetone, dioxane and dimethyl formamide. The spectral changes have been explained in terms of shifts in equilibria among different molecular and ionic species of BTAR and BTAS existing in solution. The pKa values corresponding to the different ion&ation steps have been determined at 25~ and I=0.1M (KN03) by graphic analysis of the absorbance-pH curves. The results obtained are discussed in terms of the molecular structure of the reagents and the nature of the organic co-solvent used.
Research Authors
Mohamed S. Abu-Bakr, ~'2 Anwar S. E1-Shahawy, !
and Seddique M. Ahmed
Research Department
Department of chemistry
Research Journal
Journal of Solution Chemistry,
Research Member
Seddique Mahmoud Ahmed Farag
Research Pages
12
Research Rank
1
Research Vol
Vol. 22, No. 7, 1993 , 663-674
Research Year
1993

Spectrophotometric Study of Acid-Base
Equilibria of 4-(2-Benzothiazolylazo)resorcinol
and 4-(2-Benzothiazolylazo)salicylic Acid in
Water-Organic Solvent Media

Research Abstract
The visible absorption spectra of 4-(2-benzothiazolylazo)resorcinol (BTAR) and 4-(2-benzothiazolylazo)salicylic acid (BTAS) have been recorded in water- organic solvent mixtures in the pH range 0_5-12.0. The organic solvents used are methanol, ethanol, n-propanot, iso-propanol, acetone, dioxane and dimethyl formamide. The spectral changes have been explained in terms of shifts in equilibria among different molecular and ionic species of BTAR and BTAS existing in solution. The pKa values corresponding to the different ion&ation steps have been determined at 25~ and I=0.1M (KN03) by graphic analysis of the absorbance-pH curves. The results obtained are discussed in terms of the molecular structure of the reagents and the nature of the organic co-solvent used.
Research Authors
Mohamed S. Abu-Bakr, ~'2 Anwar S. E1-Shahawy, !
and Seddique M. Ahmed
Research Department
Department of chemistry
Research Journal
Journal of Solution Chemistry,
Research Member
Anwar Saied Mohamed Saied Alshehawy
Research Pages
12
Research Rank
1
Research Vol
Vol. 22, No. 7, 1993 , 663-674
Research Year
1993

Spectrophotometric Study of Acid-Base
Equilibria of 4-(2-Benzothiazolylazo)resorcinol
and 4-(2-Benzothiazolylazo)salicylic Acid in
Water-Organic Solvent Media

Research Abstract
The visible absorption spectra of 4-(2-benzothiazolylazo)resorcinol (BTAR) and 4-(2-benzothiazolylazo)salicylic acid (BTAS) have been recorded in water- organic solvent mixtures in the pH range 0_5-12.0. The organic solvents used are methanol, ethanol, n-propanot, iso-propanol, acetone, dioxane and dimethyl formamide. The spectral changes have been explained in terms of shifts in equilibria among different molecular and ionic species of BTAR and BTAS existing in solution. The pKa values corresponding to the different ion&ation steps have been determined at 25~ and I=0.1M (KN03) by graphic analysis of the absorbance-pH curves. The results obtained are discussed in terms of the molecular structure of the reagents and the nature of the organic co-solvent used.
Research Authors
Mohamed S. Abu-Bakr, ~'2 Anwar S. E1-Shahawy, !
and Seddique M. Ahmed
Research Department
Department of chemistry
Research Journal
Journal of Solution Chemistry,
Research Member
Mohamed Saied Abo Bakr Hasan
Research Pages
12
Research Rank
1
Research Vol
Vol. 22, No. 7, 1993 , 663-674
Research Year
1993

entropies and entanglement for initial mixed state in the mulit-quanta JC Model with the stark shift and Kerr-like medium

Research Authors
A.S.F.obada, F.A.mohamed , H.A.hussein,and A.B.A. mohamed
Research Department
Department of Mathematics
Research Journal
international journal of theoretical physics
Research Member
Farouk Ali Mohamed El-Sayed
Research Rank
1
Research Year
2006

the excess free energy and the osmotic pressuere in terms of the binary and triplet distribution functions for electron gas

Research Authors
N. A. Hussein,F. A. Mohammed, A. H. Ahmed and D. A. E. Ibrahim
Research Department
Department of Mathematics
Research Journal
Bulletin the faculty of science assuit university
Research Member
Nagat Abdel-rahman Hussein Mohamed
Research Pages
11-24
Research Rank
2
Research Vol
Vol. 32 - NO. 1
Research Year
2003

the excess free energy and the osmotic pressuere in terms of the binary and triplet distribution functions for electron gas

Research Authors
N. A. Hussein,F. A. Mohammed, A. H. Ahmed and D. A. E. Ibrahim
Research Department
Department of Mathematics
Research Journal
Bulletin the faculty of science assuit university
Research Member
Farouk Ali Mohamed El-Sayed
Research Pages
11-24
Research Rank
2
Research Vol
Vol. 32 - NO. 1
Research Year
2003
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