123252-87-9Relevant academic research and scientific papers
Chemically modified silica-gel with an azo-schiff ligand and its metal complexes with Cu(II), Co(II), Ni(II) and Mn(II): Applications as catalysts on the oxidation of cyclohexane under microwave power
Urus, Serhan,Oezdemir, Mecit,Ceyhan, Goekhan,Tuemer, Mehmet
, p. 382 - 391 (2012)
A novel 2-hydroxy-5-((2-hydroxyphenyl)diazenyl)benzal- dehyde (L 1: HPDB) ligand was synthesized and bound to silica gel, which was activated with 3-aminopropyltriethoxysilane. Cu(II), Co(II), Ni(II), and Mn(II) complexes of silica-supported ligand (L2: MDPMP) were synthesized. A buffer (pH = 12) was used for a coupling reaction of diazonium electrophile to salicylaldehyde. The ligand and its complexes were characterized by using NMR, FT-MIR/FAR, elemental analysis, ICP-OES, TGA, and scanning electron microscopy. Catalytic properties of the complexes were investigated for the selective oxidation of cyclohexane under microwave power. Silica-supported L 2-Cu(II) complex showed well selective catalytic activity for the oxidation of cyclohexane to cyclohexanol and cyclohexanone with 8.40% and 3.77% yields with 48.43% conversion. Copyright Taylor & Francis Group, LLC.
RELATION BETWEEN MOLECULAR STRUCTURE AND SPECTRAL CHARACTERISTICS OF SOME CHELATING MONO-AZO DYES BASED ON o-HYDROXY ARYL ALDEHYDES AND CARBOXYLIC ACIDS
Dessouki, H. A.,Issa, R. M.,Moustafa, M. E.
, p. 775 - 776 (2007/10/02)
The electronic spectra of some chelating mono-azo compounds have been studied in some organic solvents of varying polarities.The u.v. bands in ethanol and cyclohexane are assigned in the light of electronic transitions.The effect of microscopic and macroscopic solvent polarity parameters are also discussed.The i.r. spectra of the solid compounds as KBr discs as well as the 1H NMR spectra have also been assigned and discussed in relation to molecular structure.The azo ->/- hydrazone tautomerism in some of these compounds is assured.The study indicated that the colour of the materials depends on the polarity and the formation of intermolecular H-bonds with the solvent molecules.
