Copper

2078's picture

Spectrophotometric and Polarographic Studies of Di-2-Pyridyl Ketone 2-Thienoylhydrazone

Journal Title, Volume, Page: 
nalytical Letters Volume: 27 Issue: 10 Pages: 1907-1919 Published: 1994
Year of Publication: 
1994
Authors: 
Ali Z. Abu Zuhri
Department of Chemistry, Faculty of Science, UAE , University, Al-Ain , P.O.Box 17551, United Arab Emirates
Mohamad S. El-Shahawi
Department of Chemistry, Faculty of Science, UAE , University, Al-Ain , P.O.Box 17551, United Arab Emirates
Mostafa M. Kamal
Department of Chemistry, Faculty of Science, UAE , University, Al-Ain , P.O.Box 17551, United Arab Emirates
Mohamad Al-Nuri
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Mohamed Hannoun
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
Preferred Abstract (Original): 

The spectral and differential pulse polarographic (DPP) behaviour of di-2-pyridyl ketone 2-thienoylhydrazone (DPKTH) has been investigated in 30% (v/v) ethanol-buffer mixtures over a wide range of pH (2.0-12.0). The spectral bands located at 325, 276. 230 and 208 nm of the DPKTH in ethanol are assigned to the possible electronic transitions of the molecule. The spectral data at various pH values indicates that the molecule characterized by the keto = enol tautomerization and the pK(a) value for the enolic form of the compound is determined in aqueous ethanol and was found to be 10.6. The effect of various operational parameters on the reduction current and the mechanism of the electrode reaction of DPKTH at the DME are discussed. The main reduction peaks are attributed to the reduction of C=N centre of both the keto and enol forms. This behaviour is compared with the DPP behaviour of the other related acid hydrazone compounds. The applicability of DPP technique for the trace determination of DPKTH was tested under the optimum experimental conditions and the detection limit is found to be 0.09 mu m.

2078's picture

Spectrophotometric Determination of Trace Amounts of Cobalt and Copper with 3- (2'-Thiazolylazo)- 2,6- Diaminopyridine

Journal Title, Volume, Page: 
Spectroscopy Letters, Volume 25, Issue 7 November 1992 , pages 1049 - 1055
Year of Publication: 
1992
Authors: 
Basem F. Shraideh
Ali. Z. Abu Zuhri
Mohammad Hannoun
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 

Sensitive methods for the determination of trace amounts of cobalt and copper by complexation with 3-(2'-Thiazolylazo)-2,6- diaminopyridine (2,6-TADAP) are described. Copper forms a 1:2 violet complex with the reagent having a molar absorptivity of 1.00  times 104 L mol-1cm-1, Baer's law is obeyed over the range 0 -50.84 μg in the total volume of 10ml. Cobalt also forms a 1:1 green complex with a molar absorptivity of 1.07 times 104L mol-1cm-1 and obeying Beer's law over the range 0 -23.57 μg in the total volume of 10 ml. The procedure is simple and rapid without any tedious extraction steps for copper and without oxidation of cobalt (II) to cobalt (III).

salshakshir@najah.edu's picture

Speciation of Charged Complexes by Donnan Dialysis

Journal Title, Volume, Page: 
Analytical Letters Volume 21, Issue 9
Year of Publication: 
1988
Authors: 
Samar Al-shakshir
Chemistry Department, An-Najah National University, Nablus, Palestine
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
James A. Cox
Preferred Abstract (Original): 

The assignment of metal complexes to various regimes on the basis of their dissociation kinetics is one type of metal speciation study. The most common scheme, which involves column ion-exchange as a means of separating free metal ions and metals in the form of highly labile complexes from other forms of metals in the sample, is demonstrated to categorize incorrectly stable, charged complexes such as iron(II) and nickel(II) o-phenanthroline as labile. Donnan dialysis is an alternative ion-exchange method for metal speciation studies. Data are provided which demonstrate that the above complexes are correctly assigned by the Donnan dialysis method. The relative labilities of ethylenediamine and triethylenetetramine complexes of iron (II) and nickel (II) are also correctly determined by Donnan dialysis.

2098's picture

Spectrophotometric Determination of Trace Amounts of Cobalt and Copper with 3- (2′-Thiazolylazo)- 2,6- Diaminopyridine

Journal Title, Volume, Page: 
Spectroscopy Letters: An International Journal for Rapid Communication Volume 25, Issue 7, Pages 1049-1055
Year of Publication: 
1992
Authors: 
Bassem F. Shraydeha
Chemistry Department, Faculty of Science , An-Najah National University , Nablus, Palestine
Current Affiliation: 
Department of Chemistry, An-Najah National University, Nablus, Palestine
Ali. Z. Abu Zuhria
Chemistry Department, Faculty of Science , An-Najah National University , Nablus, Palestine
Mohammad Hannouna
Chemistry Department, Faculty of Science , An-Najah National University , Nablus, Palestine
Preferred Abstract (Original): 

Sensitive methods for the determination of trace amounts of cobalt and copper by complexation with 3-(2′-Thiazolylazo)-2,6- diaminopyridine (2,6-TADAP) are described. Copper forms a 1:2 violet complex with the reagent having a molar absorptivity of 1.00 × 104 L mol−1cm−1, Baer's law is obeyed over the range 0 −50.84 μg in the total volume of 10ml. Cobalt also forms a 1:1 green complex with a molar absorptivity of 1.07 × 104L mol−1cm−1 and obeying Beer's law over the range 0 –23.57 μg in the total volume of 10 ml. The procedure is simple and rapid without any tedious extraction steps for copper and without oxidation of cobalt (II) to cobalt (III).

2052's picture

Effect of Root‐Treatment of Cauliflower, Parsley and Spinach Plants with Copper and Zinc on the Plant‐Growth

Journal Title, Volume, Page: 
Water Air and Soil Pollution, 01/1995; 30(10):2123 - 2132
Year of Publication: 
1995
Authors: 
Mohammed Alsubu
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
Radi Salima
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
M. Isaa
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Preferred Abstract (Original): 
The effect of copper and zinc ions as growth ‐ inhibitors of plants was studied by the root‐treatment of cauliflower, parsley and spinach plants. Both copper and zinc showed an obvious growth‐inhibition effect on the growth of the studied plants as well as on their various parts.The sensitivities of cauliflower, parsley and spinach plants towards treatment with copper and zinc solutions were compared between each other as well as between their various parts.The toxicity effects of zinc and copper on the growth of plants were compared. Copper showed higher toxic effect on the growth of treated cauliflower, spinach and parsley plants as well as on the growth of the various parts of treated plants.
warad's picture

A Theoretical Investigation on the Corrosion Inhibition of Copper by Quinoxaline Derivatives in Nitric Acid Solution

Journal Title, Volume, Page: 
Int. J. Electrochem. Sci., 7 ( 2012 ) 6353 - 6364
Year of Publication: 
2012
Authors: 
A.Zarrouk
LCAE-URAC18, Faculté des Sciences, Université Mohammed 1er, Oujda-60000, Morocco
H. Zarrok
Laboratoire des Procèdes de Séparation, Faculté des Sciences, Université Ibn Tofail, Kénitra, Morocco
R. Salghi
Equipe de Génie de l’Environnement et Biotechnologie, ENSA, Université Ibn Zohr, BP1136 Agadir, Morocco
B. Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed 1er, Oujda-60000, Morocco
S.S. Al-Deyab
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
R. Touzani
Faculté Pluridisciplinaire de Nador, Université Mohammed Premier, BP 300, Selouane 62700, Nador, Morocco
I. Warad
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Ri yadh 11451, Saudi Arabia
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
T. B. Hadda
Laboratoire de Chimie des Matériaux, Faculté des Sciences, Université Mohammed Premier, Oujda60000, Morocco
M. Bouachrine
UMIM, Faculté Polydisciplinaire de Taza, Université Sidi Mohamed Ben Abdellah, Taza, Morocco
Preferred Abstract (Original): 
In the present work, a theoretical study of two quinoxaline-type organic compounds, (2Z)-2-[(3E)-3(2-oxo-2-phenylethylidene)-3, 4-dihydroquinoxalin-2(1H)-ylidene]-1 phenylethanone (Q5) and (Z)-2((E)-3-(2-oxo-2-phenylethylidene)-3, 4-dihydroquinoxalin-2(1H)-ylidene)-1-phenylethanone (Q6), has been performed using density functional theory (DFT) at the B3LYP/6-31G(d) level in order to elucidate the different inhibition efficiencies and reactive sites of these compounds as corrosion inhibitors. The efficiencies of corrosion inhibitors and the global chemical reactivity relate to some parameters, such as highest occupied molecular orbital energy (E ), lowest unoccupied molecular orbital energy (E LUMO HOMO ), energy gap (ΔE), dipole moment (µ), electronegativity (χ), electron affinity (A), global hardness (η), softness (s), ionization potential (I), the fraction of electrons transferred (∆N), the global electrophilicity (ω) and the total energy (TE), were calculated. All calculation has been performed by considering Density Functional Theory (DFT) using the GAUSSIAN03W suite of programs. The calculated results are in agreement with the experimental data on the whole.
warad's picture

N-containing Organic compound As An Effective Corrosion Inhibitor For Copper In 2M HNO3: Weight Loss and Quantum Chemical Study

Journal Title, Volume, Page: 
Scholars Research Library Der Pharma Chemica, 2011, 3 (5): 263-271
Year of Publication: 
2011
Authors: 
A. Zarrouk
LCAE-URAC18, Faculté des Sciences, Universite Moham med Premier, Oujda, Morocco
B. Hammouti
LCAE-URAC18, Faculté des Sciences, Universite Moham med Premier, Oujda, Morocco
H. Zarrok
Laboratoire des procèdes de séparation, Faculté des Sciences, Kénitra, Morocco
I. Warad
Department of Chemistry, King Saud University, Riya dh, Saudi Arabia
Current Affiliation: 
Department of Electrical Engineering, Engineering Faculty, An-Najah National University, Nablus 97300, Palestine
M. Bouachrine
UMIM, Faculté Polydisciplinaire de Taza, Université Sidi Mohamed Ben Abdellah, Taza, Morocco
Preferred Abstract (Original): 
2Z)-1-(4-chlorophenyl)-2-[(3E)-3-[2-(4-chloropheny l)-2-oxoethylidene]-3,4dihydro quinoxalin- 2 (1H)-ylidene]ethanone (Q4) was tested as inhibito r for the corrosion of copper in 2M HNO 3 using gravimetric method at 303 – 343 K. The inhibi tor (Q4) showed about 90% inhibition efficiency (E (%)) at an optimum concentration of 1 0 -3 M. The inhibition efficiency increases with increase in inhibitor concentration but decrease wi th rise in temperature. Various parameters (Ea , ∆G ° ads , K ads ) for adsorption reveal a strong interaction betwee n inhibitor and copper surface. The negative values of ∆G° ads indicate the spontaneous adsorption of the inhibit or on copper surface. Kinetic parameters activation such as a E , aH °∆ , aS °∆ and pre-exponential factor have been calculated and discussed. Further, theore tical calculations were carried out and relations between computed parameters and experimen tal inhibition efficiency were discussed.
warad's picture

Thermodynamic Study of Metal Corrosion and Inhibitor Adsorption Processes in Copper/N-1-Naphthylethylenediamine Dihydrochloride Monomethanolate/Nitric Acid System: Part 2

Journal Title, Volume, Page: 
Research on Chemical Intermediates, Volume 38, Issue 7, pp 1655-1668
Year of Publication: 
2012
Authors: 
A. Zarrouk
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier, B.P. 717, 60000, Oujda, Morocco
B. Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier, B.P. 717, 60000, Oujda, Morocco
H. Zarrok
Laboratoire des procèdes de séparation, Faculté des Sciences, Université Ibn Tofail, B.P. 242, 14000, Kenitra, Morocco
S. S. Al-Deyab
Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh, 11451, Saudi Arabia
I. Warad
Petrochemical Research Chair, Chemistry Department, College of Science, 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
Preferred Abstract (Original): 
N-1-Naphthylethylenediamine dihydrochloride monomethanolate (N-NEDHME) was tested as a corrosion inhibitor for copper in 2 M HNO3 solution using the standard gravimetric technique at 303–343 K. N-NEDHME acts as an inhibitor for copper in an acidic medium. Inhibition efficiency increases with increase in concentration of N-NEDHME but decreases with a rise in temperature. Thermodynamic parameters such as adsorption heat ( \UpdeltaH∘ads ), adsorption entropy ( \UpdeltaS∘ads ) and adsorption free energy (\UpdeltaG∘ads) were obtained from experimental data of the temperature studies of the inhibition process at five temperatures ranging from 303 to 343 K. Kinetic parameters activation such as Ea , \UpdeltaH∘a , \UpdeltaS∘a and pre-exponential factors have been calculated and are discussed. Adsorption of N-NEDHME on the copper surface in 2 M HNO3 follows the Langmuir isotherm model.
warad's picture

Syntheses, Physico-Chemical Studies and Antioxidant Activities of Transition Metal Complexes with a Perimidine Ligand

Journal Title, Volume, Page: 
Zeitschrift für anorganische und allgemeine Chemie, Volume 638, Issue 5, pages 881–886, April 2012
Year of Publication: 
2012
Authors: 
Dr. Mohammad Azam
Department of Chemistry, King Saud University, P. O. Box 2455, Riyadh 11451, KSA
Ismail Warad
Department of Chemistry, King Saud University, P. O. Box 2455, Riyadh 11451, KSA
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
Saud Al-Resayes
Department of Chemistry, King Saud University, P. O. Box 2455, Riyadh 11451, KSA
Maryam Zahin
Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202 002, India
Iqbal Ahmad
Department of Agricultural Microbiology, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202 002, India
Mohammad Shakir
Department of Chemistry, Aligarh Muslim University, Aligarh 202002, India
Preferred Abstract (Original): 
A series of mononuclear complexes of the type, [MLCl2] [M = CoII, NiII, CuII, and ZnII] with a pyrimidene-type ligand, which was synthesized by the reaction of 2-furaldehyde and 1, 8-diaminonaphthalene, was obtained. The ligand and its complexes were characterized by elemental analysis, IR, NMR, EPR, and UV/Vis spectroscopy, ESI-mass spectrometry, magnetic susceptibility, molar conductivity, and thermogravimetric analyses. On the basis of UV/Vis spectroscopic and magnetic susceptibility data, an octahedral arrangement was assigned around all metal ions. The low molar conductivity data for all the complexes show their non-electrolytic nature. The thermal behavior of the complexes was studied by TGA analyses. The electrochemical study carried out on the CuII complex exhibits a quasi reversible redox process. The ligand and its complexes showed potential antioxidant and antimicrobial activities.
warad's picture

Comparative Study of new Pyridazine Derivatives Tow Ards Corrosion of Copper in Nitric Acid: Part-1

Journal Title, Volume, Page: 
Int. J. Electrochem. Sci., 5 (2010) 696 - 705
Year of Publication: 
2010
Authors: 
A. Zarrouk
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier B.P. 717, 60000 Oujda, Morocco
T. Chelfi
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier B.P. 717, 60000 Oujda, Morocco
A. Dafali
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier B.P. 717, 60000 Oujda, Morocco
B. Hammouti
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier B.P. 717, 60000 Oujda, Morocco
S.S. Al-Deyab
Department of Chemistry - College of Science, King Saud University, B.O. 2455 Riaydh 11451 Saudi Arabia
I. Warad
Department of Chemistry - College of Science, King Saud University, B.O. 2455 Riaydh 11451 Saudi Arabia
Current Affiliation: 
Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine
N. Benchat
LCAE-URAC18, Faculté des Sciences, Université Mohammed Ier B.P. 717, 60000 Oujda, Morocco
M. Zertoubi
Laboratoire LEMI, Faculté des sciences, Université Ain Chock casablanca, B.P 5366 Maarif Casablanca
Preferred Abstract (Original): 
The inhibition of the corrosion of copper in 2M HNO3 by 5-[hydroxy(phenyl)methyl]-6 methylpyridazin-3 (2.6 )-one (P1), 4-(2-chlorobenzyl)-6-hydrazino-3-methyl-1,6-dihydropyridazine (P2), 5-(2,6-dichlorobenzyl) -6-methylpyridazin-3(2H)-one (P3) and 5-[(2chlorophenyl) (hydroxy)methyl]-6-methylpyridazin-3(2H)-one (P4) has been investigated at 303K using weight loss measurements, potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) methods). Results obtained show that P3 and P4 are the best inhibitors and their inhibition efficiencies (E %) increase with the increase of inhibitor concentration and reach up to 96 and 94 % for P3 and P4 at 10-3 M, respectively. Moreover, polarisation studies clearly reveal that the presence of inhibitors changes the mechanism of hydrogen evolution and that they act as mixed inhibitors. EIS study shows that charge transfer resistance increases with the inhibitor concentration. The adsorption of P3 obeys to the Langmuir isotherm. The activation parameters of copper in the presence and absence of P3 are also evaluated and discussed. Effect of temperature is studied between 298 and 353 K and determination of activation parameters is also discussed in part 2. Explanation by quantum indices to correlate inhibition efficiency should be given in part 3.
Syndicate content