Hasan Kocaokutgen

Polarographic and voltammetric behaviour of 2-hydroxy-3-tert-butyl-5-methylazobenzene

The polarographic and voltammetric behaviour of 2-hydroxy-3-tert-butyl-5-methylazobenzene has been studied in aqueous-ethanol mixtures of different pH using DCP and DPP polarographic and CV and SWV voltammetric methods. The reduction of the azo linkage takes place via two electrons at pH > 7, but four electrons at pH < 7 in aqueous-ethanol mixtures. It has been determined that there is a linear relationship between the current and concentration and the lowest detection limit has been found as 1 × 10−7 M (for SWV).

Preparation and Characterization of Chromophor Group Containing Cyclotriphosphazenes: III Bis-Azo Chromophor Carrying Some Cyclotriphosphazenes

Abstract Some new substituted cyclotriphosphazenes were prepared by the reaction of hexachlorocy-clotriphosphazene and 4-hydroxyazo compounds such as 4-hydroxyazobenzene, 4′-ethyl-4-hydroxyazobenzene, 4′-ethyl-4-hydroxyazobenzene, 4′-tertbutyl-4-hydroxyazobenzene, 4′-methoxy-4-hydroxyazobenzene, 3′,4′-dichloro-4-hydroxyazobenzene, 2′-chloro-4-hydroxyazobezene and 2′-methoxy-5′-chloro-4-hydroxyazobenzene. The structure of the compounds with the general formula [NP(OC6H4N=N-Ar)2]3. was determined by UV-VIS, IR, 1H-NMR and elemental analysis.

An Investigation of 13C-NMR Spectra of Some Intramolecular Hydrogen Bonded and Non-Bonded Azo Dyes

Abstract The 13C-NMR spectra of the azo dyes which were synthesized by reacting substituted benzenediazonium chloride with derivatives of some phenol have been measured. The spectral data of these compounds were described considering intramolecular hydrogen bond and not. The chemical shift assignments were made regarding substituent effects.

Synthesis and Spectral Characterization of Metal Complexes of 1‐(2‐Hydroxy‐4‐methylphenylazo)‐2‐naphthol

Abstract The o,o′‐dihydroxyazo dye, 1‐(2‐hydroxy‐4‐methylphenylazo)‐2‐naphthol (HMPAN), and its metal complexes (chromium, cobalt, and iron) having the ligand to metal ratio 2:1 have been synthesized, but manganese forms a 1:1 complex. The spectral characterization of HMPAN and its complexes by IR, UV–VIS, 1H and 13C NMR spectroscopic techniques, and elemental analyses are reported.

2,6-Dimethyl-4-(phenyldiazenyl)phenol.

The crystal structure of the title compound, C14H14N2O, determined at 293 K, shows that the molecule is approximately planar in the solid state and that the aromatic rings have a trans configuration with respect to the azo double bond, as found for other diazene derivatives. The packing can be described as a polymeric arrangement of molecules linked through O-H...N and C-H...O hydrogen bonds and close contacts. These intermolecular interactions result in the formation of infinite chains parallel to the b axis.

3-tert-Butyl-2hydroxy-5-methoxyazobenzene

The structure of the title compound, C 17 H 20 N 2 O 2 , shows features characteristic of azobenzene derivatives and is perfectly planar in the solid state with a trans configuration. The molecule has an intramolecular O1-H1...N1 hydrogen bond.

(E)-4-(4-Ethyl­phenyl­diazen­yl)-2,6-dimethylphenyl acrylate

The title compound, C19H20N2O2, has a trans configuration with respect to the diazene double bond. The dihedral angle between the planes of the two aromatic rings is 2.92 (3)°.

3-tert-Butyl-2'-chloro-2-hydroxy-5-methylazobenzene

The crystal structure of the title compound, 6-tert-butyl-2-(2-chlorophenyldiazenyl)-4-methylphenol, C17H19ClN2O, determined at room temperature, shows that the molecule is essentially planar, as found for other azobenzene derivatives, and features a significant intramolecular H⋯N interaction of 1.75 (3) A resulting in the formation of a six-membered ring.