The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform
Byung Tae Ahn - One of the best experts on this subject based on the ideXlab platform.
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Sodium-doping of ZnTe film by close-spaced sublimation for back contact of CdTe solar cell
Current Applied Physics, 2011Co-Authors: Kyu Charn Park, Eun Seok Cha, Byung Tae AhnAbstract:Abstract Low resistivity p-type ZnTe film was formed by close-spaced sublimation utilizing Sodium Compounds as Sodium source for doping. Sodium was incorporated during film deposition with ZnTe sources containing various amount of Na 2 Te, Na 3 PO 4 , or NaCl. Film resistivity of less than 1 Ω cm with hole concentration of 6 × 10 17 cm −3 was achieved by doping with Na 2 Te. However, doping with Na 3 PO 4 or NaCl was less effective in reducing the resistivity of ZnTe film due to low carrier concentration. Hole mobility was correlated with the microstructure of the ZnTe film, which strongly depends on the kind and content of Sodium Compound in the source.
Sadia Rehman - One of the best experts on this subject based on the ideXlab platform.
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new dicoumarol Sodium Compound crystal structure theoretical study and tumoricidal activity against osteoblast cancer cells
Chemistry Central Journal, 2013Co-Authors: Sadia Rehman, Muhammad Ikram, Ajmal Khan, Soyoung Min, Effat Azad, Thomas S Hofer, K H Mok, Robert J Baker, Alexander J BlakeAbstract:Enormous interest had been paid to the coordination chemistry of alkali and alkaline metal ions because of their role inside body viz; their Li+/Na+ exchange inside the cell lead to different diseases like neuropathy, hypertension, microalbuminuria, cardiac and vascular hypertrophy, obesity, and insulin resistance. It has been presumed that alkali metal ions (whether Na+ or K+) coordinated to chelating ligands can cross the hydrophobic cell membrane easily and can function effectively for depolarizing the ion difference. This unique function was utilized for bacterial cell death in which K+ has been found coordinated valinomycin (antibiotic). Distinct Sodium adduct (1) with dicoumarol ligand, 4-Hydroxy-3-[(4-hydroxy-2-oxo-4a,8a-dihydro-2H-chromen-3-yl)-phenyl-methyl]-chromen-2-one (L) is isolated from the saturated solution of Sodium methoxide. Single crystal X-ray diffraction studies of the adduct reveals that Sodium is in the form of cation attached to a methoxide, methanol and a dicoumarol ligand where carbonyl functional groups of the coumarin derivative are acting as bridges. The Sodium Compound (1) is also characterized by IR, 1H-NMR, and 13C{1H}-NMR spectroscopic techniques. The composition is confirmed by elemental analysis. DFT study for 1 has been carried out using B3LYP/6-13G calculations which shown the theoretical confirmation of the various bond lengths and bond angles. Both the Compounds were studied subsequently for the U2OS tumoricidal activity and it was found that L has LD50 value of 200 μM whereas the Sodium analog cytotoxicity did not drop down below 60%. A Sodium analogue (1) with medicinally important dicoumarol ligand (L) has been reported. The crystal structure and DFT study confirm the formation of cationic Sodium Compound with dicoumarol. The ligand was found more active than the Sodium analog attributed to the instability of 1 in solution state. Coumarin Compound with Sodium was observed to be less cytotoxic than the ligand, its LD50 value never dropped below 60%.
Kyu Charn Park - One of the best experts on this subject based on the ideXlab platform.
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Sodium-doping of ZnTe film by close-spaced sublimation for back contact of CdTe solar cell
Current Applied Physics, 2011Co-Authors: Kyu Charn Park, Eun Seok Cha, Byung Tae AhnAbstract:Abstract Low resistivity p-type ZnTe film was formed by close-spaced sublimation utilizing Sodium Compounds as Sodium source for doping. Sodium was incorporated during film deposition with ZnTe sources containing various amount of Na 2 Te, Na 3 PO 4 , or NaCl. Film resistivity of less than 1 Ω cm with hole concentration of 6 × 10 17 cm −3 was achieved by doping with Na 2 Te. However, doping with Na 3 PO 4 or NaCl was less effective in reducing the resistivity of ZnTe film due to low carrier concentration. Hole mobility was correlated with the microstructure of the ZnTe film, which strongly depends on the kind and content of Sodium Compound in the source.
Peter W. Roesky - One of the best experts on this subject based on the ideXlab platform.
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Sodium and potassium Compounds of [(η6-benzenecarboxylate)Cr(CO)3] and [(η6-1,4-benzenedicarboxylate)Cr(CO)3]
Dalton Transactions, 2010Co-Authors: Balasubramanian Murugesapandian, Peter W. RoeskyAbstract:Reactions of [{η6-C6H5COOH}Cr(CO)3] with Sodium and potassium hydroxide resulted in the corresponding alkali metal derivatives [Na(H2O)3{η6-C6H5COO}Cr(CO)3] and [K2(H2O)(CH3OH)1.5[{η6-C6H5COO}Cr(CO)3]2]. Deprotonation of [{η6-p-C6H4(COOH)2}Cr(CO)3] with Sodium and potassium hydroxide gave the Sodium Compound [{Na(H2O)3}2{η6-p-C6H4(COO)2}Cr(CO)3] and the potassium Compound [{K2(CH3OH)(H2O)2}{η6-p-C6H4(COO)2}Cr(CO)3]. All substances form two-dimensional structures in the solid state. Hydrogen bonds are observed in all Sodium complexes between some carboxylate groups and coordinated water molecules. The hydrogen bonds are an essential part of the network. As a result of the higher coordination number of the potassium atoms, the polymeric networks can be constructed by direct interaction of the oxygen atoms of the carboxylic anions with the alkali metal atom. No hydrogen bonds are observed in the potassium Compounds. In all Compounds, except those of [Na(H2O)3{η6-C6H5COO}Cr(CO)3], the alkali metal atoms form isocarbonyl bridges to the chromium atoms.
Alexander J Blake - One of the best experts on this subject based on the ideXlab platform.
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new dicoumarol Sodium Compound crystal structure theoretical study and tumoricidal activity against osteoblast cancer cells
Chemistry Central Journal, 2013Co-Authors: Sadia Rehman, Muhammad Ikram, Ajmal Khan, Soyoung Min, Effat Azad, Thomas S Hofer, K H Mok, Robert J Baker, Alexander J BlakeAbstract:Enormous interest had been paid to the coordination chemistry of alkali and alkaline metal ions because of their role inside body viz; their Li+/Na+ exchange inside the cell lead to different diseases like neuropathy, hypertension, microalbuminuria, cardiac and vascular hypertrophy, obesity, and insulin resistance. It has been presumed that alkali metal ions (whether Na+ or K+) coordinated to chelating ligands can cross the hydrophobic cell membrane easily and can function effectively for depolarizing the ion difference. This unique function was utilized for bacterial cell death in which K+ has been found coordinated valinomycin (antibiotic). Distinct Sodium adduct (1) with dicoumarol ligand, 4-Hydroxy-3-[(4-hydroxy-2-oxo-4a,8a-dihydro-2H-chromen-3-yl)-phenyl-methyl]-chromen-2-one (L) is isolated from the saturated solution of Sodium methoxide. Single crystal X-ray diffraction studies of the adduct reveals that Sodium is in the form of cation attached to a methoxide, methanol and a dicoumarol ligand where carbonyl functional groups of the coumarin derivative are acting as bridges. The Sodium Compound (1) is also characterized by IR, 1H-NMR, and 13C{1H}-NMR spectroscopic techniques. The composition is confirmed by elemental analysis. DFT study for 1 has been carried out using B3LYP/6-13G calculations which shown the theoretical confirmation of the various bond lengths and bond angles. Both the Compounds were studied subsequently for the U2OS tumoricidal activity and it was found that L has LD50 value of 200 μM whereas the Sodium analog cytotoxicity did not drop down below 60%. A Sodium analogue (1) with medicinally important dicoumarol ligand (L) has been reported. The crystal structure and DFT study confirm the formation of cationic Sodium Compound with dicoumarol. The ligand was found more active than the Sodium analog attributed to the instability of 1 in solution state. Coumarin Compound with Sodium was observed to be less cytotoxic than the ligand, its LD50 value never dropped below 60%.