scholarly journals The Spectroscopic and theoretical investigations of complex formation of (3E,3'E)-7,7'-(carbonylbis(azanediyl))bis(3-(2-(2-hydroxyphenyl)hydrazono)-4-oxo-3,4-dihydronaphthalene-2-sulfonic acid) with metal cations

2018 ◽  
Vol 15 (2) ◽  
pp. 6207-6217
Author(s):  
Olga Kovalchukova ◽  
Mikhael Ryabov ◽  
Alexandra Obmenennaya ◽  
Nikolai Popandopulo
Keyword(s):  
Complex Formation ◽  
Mass Spectra ◽  
Coupling Reaction ◽  
Metal Cations ◽  
Spectrophotometric Titration ◽  
Vis Spectroscopy ◽  
Diazo Coupling ◽  
Theoretical Investigations ◽  
Diazo Coupling Reaction ◽  
Charge Calculations

A novel azo-dye  was isolated by a diazo-coupling reaction and characterized by the elemental analysis, mass spectra, IR and UV-VIS spectroscopy. The processes of complex formation of H4L with some mono-, bis-, and trivalent metal cations were studied by spectrophotometric titration and theoretical modeling. The NBO effective charge calculations indicate a strong covalent character of the coordination bonds at complexation.

Synthesis and Thermal-Optic Properties of Azo Polyurethane Containing Chiral Unit

2013 ◽  
Vol 538 ◽  
pp. 73-76
Author(s):  
Feng Xian Qiu ◽  
Qing Wang ◽  
Cai Hong Chen ◽  
Hao Zhao ◽  
Jin Hua Liu ◽  
...  
Keyword(s):  
Optical Switch ◽  
Coupling Reaction ◽  
Chiral Reagent ◽  
Chemical Structures ◽  
Vis Spectroscopy ◽  
Diazo Coupling ◽  
Ft Ir ◽  
Diazo Coupling Reaction ◽  
Thermal Optic ◽  
Azo Polyurethane

A new chromophore containing azo group, 3,3'-dichloro-4,4'–di-(4-amino-azo-phenyl) -diphenylmethane (CAAPM), was synthesized based on 3,3'-dichloro-4,4'-diamino– diphenylmethane, sodium nitrite and benzenamine via diazo-coupling reaction. Azobenzene polyurethane (PU) containing chiral unit was obtained from CAAPM, chiral reagent L(-)-tartaric acid and isophorone diisocyanate (IPDI). The chemical structures of CAAPM and PU were characterized by FT-IR and UV-Vis spectroscopy. The measurements of refractive index (n) and thermo-optic coefficient (dn/dT) of polyurethane were demonstrated at complex light. The values of n and dn/dT were used to calculate the dielectric constant (ε) and its variation with temperature (dε/dT). The dn/dT is 4.2000～-3.7000×10-4°C-1. The conclusion has a little significance to develop new the digital optical switch (DOS).

Preparation of New Azo Benzene Polyurethane and its Thermo-Optical Properties

2014 ◽  
Vol 905 ◽  
pp. 181-184
Author(s):  
Peng Wang ◽  
Fei Yan Ye ◽  
Guo Rong Cao ◽  
Zheng Ling Wang ◽  
Feng Xian Qiu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Switch ◽  
Coupling Reaction ◽  
Attenuated Total Reflection ◽  
Good Thermal Stability ◽  
Vis Spectroscopy ◽  
Diazo Coupling ◽  
All Optical ◽  
Diazo Coupling Reaction ◽  
All Optical Switch

The new azo benzene polyurethane (CAPU) was synthesized by diazo coupling reaction with 1,4-Diaminobenzene, sodium nitrite, and R(-)-3-chloro-1,2-propanediol. The solubility was measured with several organic solvents. Some mechanical properties of CAPU, such as tensile strength and ratio of elongation at break, were investigated. The good thermal stability of the CAPU was shown by its absorption spectrum characterized by UV-Vis spectroscopy and its melting point of 113.5°C. Moreover, the refractive index of CAPU was obtained by the attenuated total reflection (ATR) method at different temperature and wavelength, by which the materials thermo-optic coefficient was calculated. It is shown that the material has a large thermo-optic coefficient and an obvious birefringence phenomena. And the dispersion coefficient was also calculated by the Sellmeyer equation. Because of thermo-optical properties mentioned above, the CAPU could be used to design and generate the thermo-optic switch and even all-optical switch.

Experimental and Theoretical Investigations of Complex Formation of Substituted Phenylazo-Derivatives of Methylphloroglucinol

2016 ◽  
Vol 12 (8) ◽  
pp. 295-300
Author(s):  
Olga Kovalchukova ◽  
Amangdam A.T. ◽  
Strashnova S.B. ◽  
Strashnov P.V. ◽  
Romashkina E.P. ◽  
...  
Keyword(s):  
Complex Formation ◽  
Organic Ligand ◽  
Spectrophotometric Titration ◽  
Organic Ligands ◽  
Oh Groups ◽  
Tautomeric Forms ◽  
Theoretical Investigations ◽  
Derivatives Of ◽  
Theoretical Results ◽  
Titration Technique

Using spectrophotometric titration technique, the processes of complex formation of some phenylazo-derivatives of methylphloroglucinol (MPG) containing hydroxo-, nitro- and nitroso-substituents were studied. The spectral criteria of neutral and ionized forms of the organic ligands in their different tautomeric forms were determined.It was detected that the complex formation is accompanied by formation of one or two chelate cycles which involve azo- or nitroso-fragments and neighboring OH-groups of the organic ligands. Different types of coordination lead to different changes in the electronic absorption spectra.The DFT-B3LYP modeling of a Ni(II) complex of α-hydroxyphenylazo MPG established the most probable coordination mode of the organic ligand: tridentate chelating dianion, distorted square coordination of Ni-cations including one water molecule.  The theoretical results are in a good accordance with the experimental data.

scholarly journals A multicommuted flow analysis method for the photometric determination of amoxicillin in pharmaceutical formulations using a diazo coupling reaction

2011 ◽  
Vol 22 (2) ◽  
pp. 279-285 ◽  
Author(s):  
Sueny K. B Freitas ◽  
Valdinete Lins da Silva ◽  
Alberto N Araújo ◽  
Maria Conceição B. S. M Montenegro ◽  
Boaventura F Reis ◽  
...  
Keyword(s):  
Flow Analysis ◽  
Coupling Reaction ◽  
Pharmaceutical Formulations ◽  
Photometric Determination ◽  
Analysis Method ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

Synthesis of Azo Polyurethane-Urea and Investigation of its Thermo-Optic Properties

2016 ◽  
Vol 230 (2) ◽  
Author(s):  
Caihong Chen ◽  
Zhening Yang ◽  
Fengxian Qiu ◽  
Tianlin Cao ◽  
Guorong Cao ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Physical And Mechanical Properties ◽  
Isophorone Diisocyanate ◽  
Visible Spectroscopy ◽  
Diazo Coupling ◽  
Uv Visible ◽  
Diazo Coupling Reaction ◽  
The Fourier Transform ◽  
Azo Chromophore ◽  
Azo Polyurethane

AbstractAn azo chromophore molecular S(-)-1,2-bis(4-azophenyl-4-nitro)-ethylenediamine (OABANEDA) was synthesized with 4-nitroaniline and S(-)-1,2-diphenyl ethylenediamine by diazo-coupling reaction. The azo polyurethane-urea (OAAPUU) was obtained from OABANEDA, polyether diol (NJ-210) and isophorone diisocyanate (IPDI). The structure of OAAPUU was characterized by the Fourier transform infrared and UV-visible spectroscopy. The physical and mechanical properties of OAAPUU were investigated. The refractive index (

scholarly journals Diazo coupling reaction for the determination of biliverdin.

1991 ◽  
Vol 40 (8) ◽  
pp. 377-381
Author(s):  
Yuji SUZUKI ◽  
Yoshikatsu SAKAGISHI
Keyword(s):  
Coupling Reaction ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction

Analytic Methods for Bilirubin in Blood Plasma

1961 ◽  
Vol 7 (6) ◽  
pp. 603-625 ◽  
Author(s):  
Derek Watson
Keyword(s):  
Blood Plasma ◽  
Critical Evaluation ◽  
Coupling Reaction ◽  
Spectrophotometric Methods ◽  
Analytic Methods ◽  
Diazo Coupling ◽  
Diazo Coupling Reaction ◽  
In Blood Plasma

Abstract A critical evaluation of existing colorimetric and spectrophotometric methods for the determination of bilirubin in blood plasma is presented. The stoichiometric equivalences of the reagents used in the diazo coupling reaction are re-evaluated. The elimination of turbidity is discussed, as well as methods using diazo-coupling promoters. Recommendations are made concerning the preservation of specimens to prevent oxidation and procedures that give maximal specificity for the type of bilirubin pigment being assayed.

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