49545-46-2Relevant articles and documents
Optical properties of some synthesized azo thin films
El-Ghamaz, N. A.,El-Sonbati, A. Z.,Morgan, Sh. M.
, p. 92 - 98,7 (2012)
5-(4′-Alkyl phenylazo)-2-thioxothiazolidin-4-one (PATT-Ln) have been synthesized and characterized with various physico-chemical techniques. Thin films of PATT-Ln have been prepared by the thermal deposition technique in a vacuum of 3 × 10-5 mbar onto optical flat glass substrates. The absorption properties of thermally deposited PATT-Ln thin films were investigated in the wavelength range 190-2500 nm. The type of optical transition near the edge of the band gap is found to be direct allowed transition. The values of the energy gap for derivatives under investigation are calculated and found to be in the range 1.77-2.29 eV dependent on the nature of the substituent. They tend to the increase according to the following order p-(OCH3 3 2) as expected from Hammett's constant σR.
Supramolecular spectroscopic and thermal studies of azodye complexes
El-Sonbati,Diab,El-Bindary,Morgan, Sh.M.
, p. 310 - 328 (2014)
A series of heterocyclic ligand of copper(II) complexes have been synthesized by the reaction of copper(II) acetate with 5-(4′-derivatives phenylazo)-2-thioxothiazolidin-4-one (HLn) yields 1:1 and 1:2 (M:L) complexes depending on the reaction conditions. The elemental analysis, spectral (IR and ESR), conductance, magnetic measurements, and thermogravimetric analysis (TGA) are used to characterize the isolated complexes. It is found that the change of substituent affects the thermal properties of azodye rhodanine derivatives and their Cu(II) complexes. The molecular and electronic structures of the investigated compounds (HLn) were also studied using quantum chemical calculations. According to intramolecular hydrogen bond leads to increasing of the complexes stability. The data revealed that the coordination geometry around Cu(II) in all complexes (1-4) exhibit a trans square planar by NO monobasic bidentate and the two monobasic bidentate in octahedral complexes (5-7). Electronic, magnetic data and ESR spectra proposed the square planar structure for all complexes (1-4) under investigation. The value of covalency factor (β1a?? -)2 and orbital reduction factor K accounts for the covalent nature of the complexes. The activation thermodynamic parameters, such as activation energy (Ea), enthalpy (ΔH *), entropy (ΔS*), and Gibbs free energy change of the decomposition (ΔG*) are calculated using Coats-Redfern and Horowitz-Metzger methods.
Synthesis, molecular geometry, spectroscopic studies and thermal properties of Co(II) complexes
Morgan, Sh.M.,Diab,El-Sonbati
, (2018)
Co(II) complexes (1-4) were prepared and characterized by elemental analyses, infrared spectra, spectral studies, magnetic susceptibility measurements, X-ray diffraction analysis and thermogravimetric analysis (TGA). The X-ray diffraction patterns of Co(II) complexes were observed many peaks which indicate the polycrystalline nature. The thermodynamic parameters were calculated by using Coats–Redfern and Horowitz–Metzger methods. The bond length, bond angle and quantum chemical parameters of the Co(II) complexes were studied and discussed. The Co(II) complexes were tested against various Gram-positive bacteria, Gram-negative bacteria and fungi. It was found that the Co(II) complex (1) has more antifungal activity than miconazole (antifungal standard drug) against P. italicum at all concentration. The Co(II) complex (2) has more antibacterial activity than the penicillin against K. pneumoniae at all concentration. The interaction between Co(II) complexes and calf thymus DNA show hypochromism effect. The relationship between the values of HOMO–LUMO energy gap (?E) and the values of intrinsic binding constant (Kb) is revealed increasing of HOMO–LUMO energy gap accompanied by the decrease of Kb.
Supramolecular structure, stereochemistry and substituents effect on the spectral studies of novel ruthenium complexes
El-Sonbati,Belal,Abd El-Meksoud,El-Boz
, p. 200 - 206 (2012)
Novel complexes of Ru(III) with 5-(4-alkylphenylazo)-2-thioxo-4- thiazolidinone (HLn) have been prepared and characterized by elemental analysis, thermogravimetric analysis (TGA), 1H NMR, magnetic susceptibility and electronic spectral techniques. Tentative structures for the complexes are proposed. The important infrared (IR) bands and the main 1H NMR signals are assigned and discussed relative to the molecular structure. The spectra show that all complexes are octahedral in which chloride is attached to the metal ion. The spectral data were utilized to compute the important ligand field parameters B, β and Dq. The B-values suggest a strong covalency in the metal-ligand σ-bond and the Dq-values indicate a medium strong ligand field. Results show that the β-depends greatly upon the electronegativity of the donor atoms and the ligand structure and also the effect of the p-substituent groups. The ligands act as a monobasic (bis/tris-bidentate chelating agent) coordinating through NN and OH groups by replacement of a proton from the latter group there by forming a six-membered. Stability of these complexes has been investigated and a considerable interest has also been focused on the synthesis of the azo compounds and its metal complex due to its wide potential applications. In p-azo-rhodanine intramolecular OH?N hydrogen bonds have detected.
Spectroscopic, thermal and geometrical structures of Cu(II) azo rhodanine complexes
El-Sonbati,El-Deen,El-Bindary
, p. 612 - 624 (2016)
Copper(II) complexes of azo rhodanine (1-3) were prepared and characterized by elemental analyses, IR spectra, X-ray diffraction, thermogravimetric analysis (TGA), molar conductance and magnetic susceptibilities as well as mass spectra. The IR spectra sho
