Iron(II)

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Kinetics and Mechanism of Oxidation of L-Cysteine by Bis-3-di-2-pyridylketone-2-thiophenylhydrazoneiron( III) Complex in Acidic Medium

Journal Title, Volume, Page: 
E-Journal of Chemistry;2010 Supplement 1, Vol. 7, pS527
Year of Publication: 
2010
Authors: 
Ismail Warad
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Mohammed Al-Nuri
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Maher Abu Eid
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Zeid Al-Othman
Department of Chemistry, King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Saud Al-Resayes
Department of Chemistry, King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Nizam Diab
Department of Chemistry Arab American University-Jenin, P.O. Box 240, Jenin, Palestine
Preferred Abstract (Original): 

The kinetics of oxidation of L-cysteine by 3-di-2-pyridylketone-2-thiophenylhydrazone-iron(III), [Fe(DPKTH)2]3+ complex in acidic medium was studied spectrophotometrically at 36 C temperature. The molar ratios of DPKTH to iron(III) and iron(II) individually, were found to be [2:1] [DPKTH : iron(III)/(II)]. The reaction was stroked to be first-order with respect to iron(III) and L-cysteine, second-order with respected to DPKTH ligand and reversed second-order with respected to hydrogen ion concentration. Added salts did not affect the rate and no free radical was detected when radical detector was placed in the reaction mixture. Ethanol solvent ratio was found to effect both the initial rate and the maximum absorbance (ʎmax) of [Fe(DPKTH) 2]2+ complex. The initial rate rose when the temperature was increased which empowered to calculate the activation parameters. A suitable reaction mechanism was proposed.

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Kinetics And Mechanism of Oxidation of L-Cysteine By Bis-3-Di-2-Pyridylketone-2-Thiophenylhydrazone- Iron(III) Complex In Acidic Medium

Journal Title, Volume, Page: 
E-Journal of Chemistry (Impact Factor: 0.62). 01/2010; DOI: 10.1155/2010/659749
Year of Publication: 
2010
Authors: 
Ismail Warad
Department of Chemistry King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Mohammed Al-Nuri
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Maher Abu Eid
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Zeid Al-Othman
Department of Chemistry King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Saud Al-Resayes
Department of Chemistry King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Nizam Diab
Preferred Abstract (Original): 

The kinetics of oxidation of L-cysteine by 3-di-2-pyridylketone-2-thiophenylhydrazone-iron(III), [Fe(DPKTH) 2 ] 3+ complex in acidic medium was studied spectrophotometrically at 36 o C temperature. The molar ratios of DPKTH to iron(III) and iron(II) individually, were found to be [2:1] [DPKTH : iron(III)/(II)]. The reaction was stroked to be first-order with respect to iron(III) and L-cysteine, second-order with respected to DPKTH ligand and reversed second-order with respected to hydrogen ion concentration. Added salts did not affect the rate and no free radical was detected when radical detector was placed in the reaction mixture. Ethanol solvent ratio was found to effect both the initial rate and the maximum absorbance (λ max) of [Fe(DPKTH) 2 ] 2+ complex. The initial rate rose when the temperature was increased which empowered to calculate the activation parameters. A suitable reaction mechanism was proposed.

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Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Journal Title, Volume, Page: 
Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9
Year of Publication: 
1989
Authors: 
Ahmad A. Abu-Obaid
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Foad M. Mahmoud
Mohammad A. Al-Nuri
Ali Z. Abu- Zuhri
Nidal A. Zatar
Preferred Abstract (Original): 

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

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Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Journal Title, Volume, Page: 
Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9
Year of Publication: 
1989
Authors: 
Mohammad A. Al-Nuri
Chemistry Department, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Nidal A. Zatar
Chemistry Department, An-Najah National University, Nablus, Palestine
Foad M. Mahmoud
Chemistry Department, An-Najah National University, Nablus, Palestine
Ahmad A. Abu-Obaid
Chemistry Department, An-Najah National University, Nablus, Palestine
Ali Z. Abu- Zuhri
Chemistry Department, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

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Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Journal Title, Volume, Page: 
Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9
Year of Publication: 
1989
Authors: 
Nidal A. Zatar
Chemistry Department, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Foad M. Mahmoud
Chemistry Department, An-Najah National University, Nablus, Palestine
Ahmad A. Abu-Obaid
Chemistry Department, An-Najah National University, Nablus, Palestine
Mohammad A. Al-Nuri
Chemistry Department, An-Najah National University, Nablus, Palestine
Ali Z. Abu- Zuhri
Chemistry Department, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

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Simultaneous Spectrophotometric Determination of Iron(II) and Iron(III) in Mixtures Using Di-2-pyridyl Ketone Benzoylhydrazone

Journal Title, Volume, Page: 
Spectroscopy Letters: An International Journal for Rapid Communication Volume 22, Issue 9
Year of Publication: 
1989
Authors: 
Foad M. Mahmoud
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Ahmad A. Abu-Obaid
Mohammad A. Al-Nuri
Ali Z. Abu- Zuhri
Nidal A. Zatar
Preferred Abstract (Original): 

A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at 360 and 650 nm. meanwhile iron(II1) complex with DPKBH exhibits only one maximum at 360nm. Iron(II) and iron(III) complexes with DPKBH have similar behaviour at 360nm. Iron forms 1:2 complexes with the reagent. Beer's laws are obeyed over the ranges 0.1–2 μgml-1 and 0.4–5 μgrn1-l for iron(II) complexes at 360 and 650nm respectively. Iron(III) showed results similar to those obtained for iron(II) at 360nm. The effect of pH, effect of excess reagent. the stability of complexes. and the tolerance limit of many metal ions have been reported. The method is applied to the determination of total iron, iron(I1). and iron(II1) in synthetic solutions.

warad's picture

Kinetics and Mechanism of Oxidation of L-Cysteine by Bis-3-di-2-pyridylketone-2-thiophenylhydrazoneiron( III) Complex in Acidic Medium

Journal Title, Volume, Page: 
E-Journal of Chemistry;2010 Supplement 1, Vol. 7, pS527
Year of Publication: 
2010
Authors: 
Ismail Warad
Department of Chemistry, King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Mohammed Al-Nuri
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Maher Abu Eid
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Zeid Al-Othman
Department of Chemistry, King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Saud Al-Resayes
Department of Chemistry, King Saud University P.O Box 2455, Riyadh-11451, Saudi Arabia
Nizam Diab
Department of Chemistry Arab American University-Jenin, P.O. Box 240, Jenin, Palestine
Preferred Abstract (Original): 
The kinetics of oxidation of L-cysteine by 3-di-2-pyridylketone-2-thiophenylhydrazone-iron(III), [Fe(DPKTH)2]3+ complex in acidic medium was studied spectrophotometrically at 36 C temperature. The molar ratios of DPKTH to iron(III) and iron(II) individually, were found to be [2:1] [DPKTH : iron(III)/(II)]. The reaction was stroked to be first-order with respect to iron(III) and L-cysteine, second-order with respected to DPKTH ligand and reversed second-order with respected to hydrogen ion concentration. Added salts did not affect the rate and no free radical was detected when radical detector was placed in the reaction mixture. Ethanol solvent ratio was found to effect both the initial rate and the maximum absorbance (ʎmax) of [Fe(DPKTH) 2]2+ complex. The initial rate rose when the temperature was increased which empowered to calculate the activation parameters. A suitable reaction mechanism was proposed.
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