The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Nikos G Tsierkezos - One of the best experts on this subject based on the ideXlab platform.
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study of the interactions of sodium Thiocyanate Potassium Thiocyanate and ammonium Thiocyanate in water n n dimethylformamide mixtures by raman spectroscopy
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2008Co-Authors: Ioanna E Molinou, Nikos G TsierkezosAbstract:Raman spectra of water+N,N-dimethylformamide (DMF) mixtures and their solutions with NaNCS, KNCS and NH(4)NCS were obtained. The bands of nu(CO) stretching, delta(OCN) bending, r(CH(3)) rocking and nu(N-CH)(3)) stretching of the DMF molecule with and without salts were studied. The dependence of the vibration frequencies and Raman intensities of the bands on the composition of the mixed solvent was discussed. The change of the band frequencies as a result of the presence of the salts and the solvation of the cations by the solvent molecules was examined. The stronger cation solvation by the aprotic solvent molecules instead of the water molecules in DMF concentrated solutions was discussed. The nu(CN) and nu(CS) vibrations of the SCN(-) ions were observed as a function of the cation present and the solvent composition. The presence of the SCN(-) ions as "free", contact ion pairs, or solvent separated pairs, was discussed.
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Study of the interactions of Sodium Thiocyanate, Potassium Thiocyanate and Ammonium Thiocyanate in water + N,N-dimethylformamide mixtures by Raman spectroscopy
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2008Co-Authors: Ioanna E Molinou, Nikos G TsierkezosAbstract:Raman spectra of water+N,N-dimethylformamide (DMF) mixtures and their solutions with NaNCS, KNCS and NH(4)NCS were obtained. The bands of nu(CO) stretching, delta(OCN) bending, r(CH(3)) rocking and nu(N-CH)(3)) stretching of the DMF molecule with and without salts were studied. The dependence of the vibration frequencies and Raman intensities of the bands on the composition of the mixed solvent was discussed. The change of the band frequencies as a result of the presence of the salts and the solvation of the cations by the solvent molecules was examined. The stronger cation solvation by the aprotic solvent molecules instead of the water molecules in DMF concentrated solutions was discussed. The nu(CN) and nu(CS) vibrations of the SCN(-) ions were observed as a function of the cation present and the solvent composition. The presence of the SCN(-) ions as "free", contact ion pairs, or solvent separated pairs, was discussed.
Ioanna E Molinou - One of the best experts on this subject based on the ideXlab platform.
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study of the interactions of sodium Thiocyanate Potassium Thiocyanate and ammonium Thiocyanate in water n n dimethylformamide mixtures by raman spectroscopy
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2008Co-Authors: Ioanna E Molinou, Nikos G TsierkezosAbstract:Raman spectra of water+N,N-dimethylformamide (DMF) mixtures and their solutions with NaNCS, KNCS and NH(4)NCS were obtained. The bands of nu(CO) stretching, delta(OCN) bending, r(CH(3)) rocking and nu(N-CH)(3)) stretching of the DMF molecule with and without salts were studied. The dependence of the vibration frequencies and Raman intensities of the bands on the composition of the mixed solvent was discussed. The change of the band frequencies as a result of the presence of the salts and the solvation of the cations by the solvent molecules was examined. The stronger cation solvation by the aprotic solvent molecules instead of the water molecules in DMF concentrated solutions was discussed. The nu(CN) and nu(CS) vibrations of the SCN(-) ions were observed as a function of the cation present and the solvent composition. The presence of the SCN(-) ions as "free", contact ion pairs, or solvent separated pairs, was discussed.
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Study of the interactions of Sodium Thiocyanate, Potassium Thiocyanate and Ammonium Thiocyanate in water + N,N-dimethylformamide mixtures by Raman spectroscopy
Spectrochimica acta. Part A Molecular and biomolecular spectroscopy, 2008Co-Authors: Ioanna E Molinou, Nikos G TsierkezosAbstract:Raman spectra of water+N,N-dimethylformamide (DMF) mixtures and their solutions with NaNCS, KNCS and NH(4)NCS were obtained. The bands of nu(CO) stretching, delta(OCN) bending, r(CH(3)) rocking and nu(N-CH)(3)) stretching of the DMF molecule with and without salts were studied. The dependence of the vibration frequencies and Raman intensities of the bands on the composition of the mixed solvent was discussed. The change of the band frequencies as a result of the presence of the salts and the solvation of the cations by the solvent molecules was examined. The stronger cation solvation by the aprotic solvent molecules instead of the water molecules in DMF concentrated solutions was discussed. The nu(CN) and nu(CS) vibrations of the SCN(-) ions were observed as a function of the cation present and the solvent composition. The presence of the SCN(-) ions as "free", contact ion pairs, or solvent separated pairs, was discussed.
Abdou O. Abdelhamid - One of the best experts on this subject based on the ideXlab platform.
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Reaction with Hydrazonoyl Halides 64: Synthesis of Some New Triazolino[4,3‐a]pyrimidines, 1,3,4‐Thiadiazoles, and 5‐Arylazothiazoles
Journal of Heterocyclic Chemistry, 2012Co-Authors: Abdou O. Abdelhamid, Abdelgawad A. Fahmi, Basma S. BaauiAbstract:2,3-Dihydro-1,3,4-thiadiazoles, 2,3-dihydro-1,3,4-selenadiazoles, and triazolino[4,3-a]pyrimidines containing benzofuran moiety were prepared from the reaction of 2-(2-phenylhydrazono)-1-(5-bromobenzofuran-2-yl)-2-chloroethanone with each of Potassium Thiocyanate, Potassium selenocyanate, alkyl carbodithioate, and pyrmidine-2-thione derivatives. All the newly synthesized compounds were confirmed by elemental analysis, spectral data, and alternative route synthesis whenever possible.
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Reactions with Hydrazonoyl Halides 63: Synthesis and Anticancer Activity of Some New 1,3,4-Thiadiazoles, 1,3,4-Selenadiazoles, and 1,2,4-Triazolo[4,3-a]pyrimidines
Phosphorus Sulfur and Silicon and the Related Elements, 2010Co-Authors: Eman K. A. Abdelall, Mahmoud A. Mohamed, Abdou O. AbdelhamidAbstract:2,3-Dihydro-1,3,4-thiadiazoles, 2,3-dihydro-1,3,4-selenadiazoles, and triazolino[4,3-a]pyrimidines containing benzoxazole or benzothiazole moieties were prepared from the reaction of each of ethyl 3-aza-3-(benzoxazol-2-ylamino)-2-chloroprop-2-enoate and ethyl 3-aza-3-(benzothiazolo-2-ylamino)-2-chloroprop-2-enoate with each of Potassium Thiocyanate, Potassium selenocyanate, alkyl carbodithioate, and pyrmidine-2-thione derivatives. All the newly synthesized compounds were confirmed by elemental analysis, spectral data, and alternative route synthesis whenever possible. Some of the newly synthesized compounds were screened toward certain cancer tumors. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.
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Reactions with Hydrazonoyl Halides 421: Synthesis of Some New 2,3-Dihydro-1,3,4thiadiazoles, 2,3-Dihydro-1,3,4-selenadiazoles and Triazolino[ [4] , [3] ]pyrimidines
Phosphorus Sulfur and Silicon and the Related Elements, 2005Co-Authors: Abdou O. Abdelhamid, Mohamed A. M. AlkhodshiAbstract:Abstract 2,3-Dihydro-1,3,4-thiadiazoles, 2,3-dihydro-1,3,4-selenadiazoles, unsymmetrical azines and triazolino[ [4] , [3] ]pyrimidines were prepared from reaction of (2Z)-3-aza-2-bromo-1-naphto[ [1] , [2] ]furan-2-yl-3-(phenylamino)prop-2-en-1-one (6) with each of Potassium Thiocyanate, Potassium selenocyanate, alkyl carbodithioate, ethyl 6-methyl-2-methylthio-4-substituted 3,4-dihydropyrimidine-5-carboxylate or (ethyl 4-methyl-6-substituted 2-thione-1,3,6-trihydropyrimidine-5-carboxylate). All compounds were elucidated on the basis of elemental analysis, spectral data, and alternative synthesis method whenever possible.
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REACTIONS OF HYDRAZONOYL HALIDES 371: SYNTHESIS OF TRIAZOLO[4,3-a]PYRIMIDINES, 1,3,4-THIADIAZOLES AND 1,3,4-SELENADIAZOLES
Phosphorus Sulfur and Silicon and the Related Elements, 2004Co-Authors: Abdou O. Abdelhamid, Bassem A. M. Abdel-wahab, Ali A. Al-atoomAbstract:1,2,4-Triazolo[4,3-a]pyrimidines, thiadiazolines and selenadiazolines synthesized via reactions of hydrazonoyl halides with each of ethyl 4-(3,4-dimethoxyphenyl)-6-methyl-2-methylthio-3,4-dihydropyrimidine-5-carboxylate (or ethyl 6-(3,4-dimethylphenyl)-4-methyl-2-thio1,3,6-trihydropyrimidine-5-carboxylate), ethyl 4-(2,3-dimethoxyphenyl)- 6-methyl-2-methylthio-3,4-dihydropyrimidine-5-carboxylate, Potassium Thiocyanate, Potassium selenocyanate, and carbodithioates respectively.
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Reactions of hydrazonoyl halides 44 [1]: synthesis of some new 1,3,4-thiadiazolines, 1,3,4-selenadiazolines and triazolino[4,3- a ]pyrimidines
Journal of Sulfur Chemistry, 2004Co-Authors: Abdou O. Abdelhamid, Ahmed H. Elghandour, Ahmed M. Hussein, Yasser H. ZakiAbstract:1,3,4-Thiadiazolines, 1,3,4-selenadiazolines and triazolino[4,3-a]pyrimidines have been synthesized from 3-aza-[2,4-dimethyl(1,3-thiazol-5-yl)-2-bromo-3-substituted-amino]prop-2-en-1-ones with Potassium Thiocyanate, Potassium selenocyanate, alkyl carbodithioates and 6-methyl-2-methylthio-4-substituted 3,4-dihydropyrimidine-5-carboxylates. Structures of the newly synthesized compounds have been established by elemental analysis, spectral data and alternative synthesis whenever possible. Some of products have been tested towards bacteria.
Roland W. H. Pohl - One of the best experts on this subject based on the ideXlab platform.
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One-dimensional ladder like and two-dimensional polymorphs of heterometallic Thiocyanate bridged copper(II) and mercury(II) coordination polymer: Syntheses, structural, vibration, luminescence and EPR studies
Inorganica Chimica Acta, 2011Co-Authors: Ali Akbar Khandar, Axel Klein, Akbar Bakhtiari, Ali Reza Mahjoub, Roland W. H. PohlAbstract:The 1D triclinic {CuHg(en)(μ-NCS– N , S ) 4 } n ( 1 ) and 2D monoclinic {CuHg(en)(μ-NCS– N , S ) 3 (SCN)} n ( 2 ) (en = ethylenediamine) heterometallic coordination polymers, as the two polymorphs of the {CuHg(en)(NCS) 4 } n , were synthesized at room temperature by the reaction of mercuric Thiocyanate, Potassium Thiocyanate, copper(II) malonate and ethylenediamine using different reagent ratios. XRD on single crystals shows that the compound 1 consists of 1D ladder like zigzag ribbons extended along the b axis, whereas compound 2 shows a 2D wavy polymeric structure running parallel to the ab plane. In the crystal packing of the both polymorphs, the polymeric structures are further interlinked to each other via weak interactions and hydrogen bonding to afford a 3D network. Diagnostic ligand and metal–ligand bands in the IR, far-IR and Raman spectra are assigned for the studied compounds. While compound 1 shows no significant emission upon excitation at any wavelength in the UV–Vis region, compound 2 exhibits intense emission at around 410 nm. Moreover, the room temperature X-band EPR spectrum of a powdered sample of 1 , shows a signal of rhombic symmetry with g 1 = 2.2637, g 2 = 2.0765 and g 3 = 2.0483. In contrast to this, 2 reveals an axial signal with g ⊥ = 2.0742; however, the g || is unresolved.
Sabry Khalil - One of the best experts on this subject based on the ideXlab platform.
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Micro-determination of isoxsuprine hydrochloride in pharmaceutical formulations and urine samples
Analytical chemistry an Indian journal, 2014Co-Authors: Sabry KhalilAbstract:A newmethod was given for the determination of Isoxsuprine drug in pure solutions, in pharmaceutical formulations and urine samples using atomic emission and atomic absorption spectrometry. Ion ÂÂ associate complexes of Isoxsuprine hydrochloride with [zink(II), cobalt(II) Thiocyanate], Potassium ferricyanide and ammonium reineckate were precipitated and the excess unreacted metal complex was determined. The drug can be determined by the affortmethod in the range 0.36 - 54.25 igmL-1.
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New analytical method for the determination of pethidine in pharmaceutical formulations and urine samples
Analytical chemistry an Indian journal, 2014Co-Authors: Sabry Khalil, Afaf BusharaAbstract:Ion ÂÂ associate complexes of pethidine hydrochloride with zinc (II) Thiocyanate, Potassium ferricyanide and ammonium reineckate were precipitated and the excess unreacted metal complex was determined. A new method was given for the determination of pethidine drug in pure solutions, in pharmaceutical formulations and urine samples using atomic emission and atomic absorption spectrometry. The drug can be determined by the affort method in the range 0.57 - 62.43 igmL-1.