Synthesis and solvatochromic of 3-(4-N-Pyridine -2-yl benzene sulfonamide azo)-1-nitroso naphthol and use it for determination of trace amount of Cobalt (II) as complex

2016 ◽  
Vol 5 (09) ◽  
pp. 4878
Author(s):  
Fatma A. Khazaal ◽  
Hussein J. Mohammed*
Keyword(s):  
Stability Constant ◽  
1H Nmr ◽  
Linear Correlation ◽  
Trace Amount ◽  
Honey Sample ◽  
Spectral Techniques ◽  
Azo Compound ◽  
Ft Ir ◽  
The Stability

The azo reagent 3- (4-N-Pyridine -2-yl benzene sulfonamide azo)-1-nitroso naphthol was synthesized and characterized by FT-IR, 1H-NMR and 13CNMR spectral techniques. The solvatochromism of the azo compound was studied by using different solvents. Spectrophotometric determination of cobalt (II) is based on the formation of a 2:1 complex with above reagent. The complex has λmax at (452) nm and Ԑmax of (2. 0567*104) L. mol-1. cm-1.A linear correlation (0.1- 3.5μg. ml-1) was found between absorbance at λmax and concentration. The effect of diverse ions on the determination of cobalt (II) to investigate the selectivity of the method were also studied. The stability constant of the product was (2. 68*108). The proposed method was successfully applied to the analysis of honey sample. 

Synthesis and solvatochromic studies of 2- amino-3-phenolazo1-(4-sulfophenyl)-3-methyi-5-pyrozolone and use it for the determination of trace amount of Nickel (II) in blood samples

2016 ◽  
Vol 5 (10) ◽  
pp. 4920
Author(s):  
Amar M. Ali ◽  
Hussain. J. Mohammed*
Keyword(s):  
Stability Constant ◽  
Trace Amount ◽  
Benzenesulfonic Acid ◽  
Determination Method ◽  
Blood Samples ◽  
Determination Of Nickel ◽  
Normal Human ◽  
The Stability ◽  
Normal Human Blood

A new, simple, sensitive and rapid spectrophotometric method is proposed for the determination of trace amount of Nickel (II). The method is based on the formation of a 1:2 complex with 4-(4-((2-hydroxy-6-nitrophenyl) diazenyl) -3-methyl-5-oxo-2, 5-dihydro-1H-pyrazol-1-yl) benzenesulfonic acid (2-ANASP) as a new reagent is developed. The complex has a maximum absorption at 516 nm and εmax of 1. 84 X 105 L. mol-1. cm-1. A linear correlation (0. 25 – 4. 0μg. ml-1) was found between absorbance at λmax and concentration. The accuracy and reproducibility of the determination method for various known amounts of Nickel (II) were tested. The results obtained are both precise (RSD was 1. 2 %) and accurate (relative error was 0. 787 %). The effect of diverse ions on the determination of Nickel (II) to investigate the selectivity of the method were also studied. The stability constant of the product was 0. 399 X 106 L. mol-1. The proposed method was successfully applied to the analysis of diabetes blood and normal human blood. 

scholarly journals Novel cyclic voltammetry behavior of 3-((benzothiazol-2- diazenylnaphthalene-2,7-diol and use it for spectrophotometric determination of copper (II )in honey sample

2017 ◽  
Vol 12 (7) ◽  
pp. 4243-4255
Author(s):  
Fatma .A. Khazaal ◽  
Hussein. J. Mohammed ◽  
Muhammed . M.Radhi
Keyword(s):  
Cyclic Voltammetry ◽  
Spectrophotometric Determination ◽  
Glassy Carbon ◽  
Supporting Electrolyte ◽  
Honey Sample ◽  
Spectral Techniques ◽  
Scan Rate ◽  
Ft Ir ◽  
Determination Of Copper

The azo reagent 3-((benzothiazol-2-diazenylnaphthalene-2,7-diol] was synthesized and characterized by FT-IR ,1H-NMRand 13CNMR spectral techniques. The electrochemical behavior of the azo reagent and its complex with Cu (II) has beenstudied at glassy carbon disk GCE electrode in different supporting electrolyte at concentration (1M) and scan rate(100mv.s-1). Spectrophotometric determination of copper (II ) is based on the formation of a 2:1 complex with abovereagent. The complex has λmax at(588) nm and Ԑmax of( 1.436x104)L.mol-1.cm-1 .A linear correlation (0.1 – 3.0 μg. ml-1) was found between absorbance at λmax and concentration . The effect of diverseions on the determination of copper (II) to investigate the selectivity of the method were also studied . The stabilityconstant of the product was (1.1x108 ) . The proposed method was successfully applied to the analysis of honey sample .

Determination of the Stability Constant of the Calcium Dioxalate Complex

Urolithiasis ◽  
1981 ◽  
pp. 447-451
Author(s):  
John R. Burns ◽  
Birdwell Finlayson ◽  
Arthur Smith
Keyword(s):  
Stability Constant ◽  
The Stability

scholarly journals New Spectrophotometric Method for Determination of Cadmium

2009 ◽  
Vol 6 (s1) ◽  
pp. S496-S500
Author(s):  
K. S. Parikh ◽  
R. M. Patel ◽  
K. N. Patel
Keyword(s):  
Stability Constant ◽  
Spectrophotometric Method ◽  
Basic Medium ◽  
Buffer Solution ◽  
Solution Ph ◽  
Yellow Colour ◽  
Maximum Absorbance ◽  
The Stability

The reagent 2-hydroxy-4-n-butoxy-5-bromopropiophenone thiosemicarbazone (HBBrPT) has been used for the determination of Cd(II) by using spectrophotometric method. The reagent HBBrPT gave an intense yellow colour with Cd(II) solution in basic medium. The maximum absorbance was observed at 440 nm, in basic buffer solution (pH 10.00). The molor absorptivity and Sandell’s sensitivity of Cd(II)-HBBrPT complex were 4035 mol-1cm-1and 0.02765 μg cm-2respectively. The stability constant of 1:2 Cd(II)-HBBrPT complex was 8.46×106. The effect of various iron was also studied.

The determination of the stability constant for calcium EGTA

1976 ◽  
Vol 451 (1) ◽  
pp. 321-325 ◽  
Author(s):  
Jeffrey D. Owen
Keyword(s):  
Stability Constant ◽  
The Stability

scholarly journals SYNTHESIS OF NEW SUBSTITUTED PROCAINE HYDROCHLORIDE COMPOUNDS AND THEIR USE IN SPECTROPHOTOMETRIC DETERMINATION OF TETRACYCLINE HYDROCHLORIDE THROUGH DIAZOTIZATION-COUPLING REACTIONS

2021 ◽  
Vol 18 (39) ◽  
pp. 14-32
Author(s):  
Hind Sadiq Al-WARD ◽  
Mouayed Qassssim AL-ABACHI ◽  
Mohammed Rifaat AHMED
Keyword(s):  
Stability Constant ◽  
Thermodynamic Parameters ◽  
Coupling Reaction ◽  
Water Soluble ◽  
Procaine Hydrochloride ◽  
Effect Of Temperature ◽  
Basic Medium ◽  
Fast Method ◽  
The Stability

Background: Tetracycline is one of the most important antibiotics. It is used to treat many different bacterial infections. It is often used in treating severe acne, or sexually transmitted diseases such as syphilis, gonorrhea, or chlamydia. In some cases, tetracycline is used when penicillin or another antibiotic cannot be used to treat serious infections such as the ones caused by Bacillus anthracis, Listeria, Clostridium, Actinomyces. Aim: synthesized a new novel reagent used to determine TCH spectrophotometrically by using diazonium and coupling reaction. Methods: Four new substituted procaine derivatives were prepared by simple organic methods using aniline derivatives. A spectrophotometric approach was established for the micro-determination of TCH. The stoichiometry was investigated using mole ratio and continuous variation methods, and the stability constant was also estimated. The ΔG, ΔH, and ΔS were determined as thermodynamic parameters for evaluating the effect of temperature on the reaction. Results: Substituted procaine derivatives were prepared, and o-hydroxy procaine seems to be the best reagent used to determine TCH by diazotization and coupling reaction. The result was a yellow water-soluble dye with a maximum absorbance of 380 nm. The reaction conditions were studied and optimized. Beers law was obeyed over a concentration range (2.5–50) μg.mL-1 for TCH. The molar absorptivity was (14.4669.103) L.mol-1.cm-1, and the detection limit was (0.5052) μg.mL-1. The stoichiometry of the formed product was found 1:1 (o-hydroxyprocaine: TCH). The stability constant indicated that the product formed was stable, and the thermodynamic parameters showed that the diazonium salt reaction was preferred to occur at a low temperature. Conclusions: a simple, accurate, and fast method was developed to determine TCH in pure form and pharmaceuticals by coupling the TCH with a newly synthesized procaine derivative reagent (o-hydroxy procaine) in a basic medium.

scholarly journals Synthesis and Determination of the Stability Constant of Mixed Ligand Complex of Y(III)

2014 ◽  
Vol 26 (8) ◽  
pp. 2429-2433
Author(s):  
T. Çam ◽  
G. Irez
Keyword(s):  
Stability Constant ◽  
Mixed Ligand Complex ◽  
Mixed Ligand ◽  
Ligand Complex ◽  
The Stability

A comparative study of the determination of the stability constants of inclusion complexes of p-sulfonatocalix[4]arene with amino acids by RP-HPLC and 1H NMR

2001 ◽  
pp. 258-263 ◽  
Author(s):  
Olga I. Kalchenko ◽  
Florent Perret ◽  
Nicole Morel-Desrosiers ◽  
Anthony W. Coleman
Keyword(s):  
Amino Acids ◽  
Comparative Study ◽  
Inclusion Complexes ◽  
Stability Constants ◽  
1H Nmr ◽  
Rp Hplc ◽  
The Stability

Determination of the stability constant for acetic acid in synthetic seawater media at various temperatures and salinities

1985 ◽  
Vol 14 (6) ◽  
pp. 431-439 ◽  
Author(s):  
O. Johansson ◽  
M. Wedborg
Keyword(s):  
Acetic Acid ◽  
Stability Constant ◽  
Synthetic Seawater ◽  
The Stability
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