Güncel Gönderiler: Kimya Bölümü
Toplam kayıt 724, listelenen: 421-440
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The synthesis and complexation study of some novel 3-methoxyphenyl chromenone crown ethers using conductometry
(Elsevier Sci Ltd, 2006)7,8-Dihydroxy-3-(3,4-dimethoxyphenyl)-2H-chromenoiies, 7,8-diliydroxy-3-(3,5-dimethoxyphenyl)-2H-chromenones and 7,8-dihydroxy-3-(3,4,5-trimethoxypheiiyl)-2H-chromenones, o-diliydroxy-3-iiiethoxyphenyicoumarins, were ... -
Indirect determination of boron in water by cathodic stripping voltammetry
(Parlar Scientific Publications (P S P),, 2006)An indirect cathodic stripping voltammetric method for the determination of boron was described. The method is based on monitoring the peak current decrease of As(V) in the presence of mannitol, copper and selenium in ... -
Determination of arsenic by cathodic stripping voltammetry: Sensitivity improvement using high concentration of hydrochloric acid and high temperature
(Parlar Scientific Publications (P S P), 2006)A sensitivity improvement for arsenic determination in the presence of copper by cathodic stripping voltammetry, using a high concentration of hydrochloric acid (3 mol/L) and high cell temperature (40 degrees C), is ... -
Rietveld refinement, optical and photoluminescence properties of blue emitting phosphors RE(Y, Er, Gd, La, Nd)-doped CaBPO5
(Elsevier GMBH, 2016)In this paper, we have reported a systematic study on the effect of dopant ion type on the structural, luminescent and optical properties of calcium borophosphates using Xray diffraction (XRD), Rietveld analysis, vacuum ... -
Incorporation of an allene unit into alpha-pinene via beta-elimination
(Wiley-V C H Verlag Gmbh, 2006)The two double-bond isomers 3-iodo-2,6,6-trimethylbicyclo[3.1.1]hept-2-ene (6b) and 3-iodo-4,6,6-trimethylbicyclo[3.1.1]hept-2-ene (11) were synthesized by reacting 2,6,6-trimethylbicyclo[3.1.1]heptan-3-one (9) with ... -
On-line preconcentration and determination of trace elements in waters and reference cereal materials by flow injection - FAAS using newly synthesized 8-hydroxy-2-quinoline carboxaldehyde functionalized Amberlite XAD-4
(Academic Press Inc Elsevier Science, 2013)A new chelating resin has been developed using Amberlite XAD-4 resin anchored with 8-hydroxy-2-quinoline carboxaldehyde through -C=N- group. The synthesized resin, characterized by infrared spectroscopy, was used as packing ... -
Optical fluoride sensing with a bay region functionalized perylenediimide dye
(Scientific Technical Research Council Turkey-Tubitak, 2006)A perylenedimiide (PDI) derivative functionalized at the perylene core (bay region) to carry phenyl boronic acid groups was shown to interact with fluoride with changes in the emission and absorption spectrum. These changes ... -
Purification and characterization of Ocimum basilicum L. polyphenol oxidase
(Amer Chemical Soc,, 2005)A partial characterization of polyphenol oxidase (PPO) activity in Ocimum basilicum L. is described. PPO in O. basilicum L. was extracted and purified through (NH4)(2)SO4 precipitation, dialysis, and a Sepharose ... -
An investigation of chloride-substituted Schiff bases as corrosion inhibitors for steel
(Pergamon-Elsevier Science Ltd, 2003)Polarization and impedance measurements were performed on steel in deaerated 5% HCl solution with and without Schiff base additives within the concentration range 1 x 10(-4)-5 x 10(-3) mol/dm(3). The Schiff base compounds ... -
A microwave-assisted route for the solid-state synthesis of lead pyrophosphate, Pb2P2O7
(Springer, 2005)In this study, we have developed a new method based on microwave heating for the preparation of lead pyrophosphate compound, Pb2P2O7. The favoring of microwave heating as synthesis technique is based on the fact being much ... -
Quantum chemical investigation of monostanna[n]cyclacenes
(Springer/Plenum Publishers, 2003)Semiempirical molecular orbital treatment at the level of PM3 type calculations has been performed on the Huckel-type monostannacyclacenes having tin atom at the fusion and periposition of arenoid rings. The effect of tin ... -
Synthesis of sodium neodymium diphosphate, NaNdP2O7, and its powder XRD data and IR spectra
(Taylor & Francis Ltd,, 2005)NaNdP2O7 was synthesized by the solution reaction of NdCl3 with Na4P2O7 and heated the precipitate at 650 degrees C for 6-7 h. The X-ray powder diffraction data of this compound was indexed in the orthorhombic system with ... -
A new route for the synthesis of cadmium sulfide by reacting of cadmium oxide with a sulfidizing gas mixture
(Maik Nauka, 2005)In this study, the sulfidization of CdO was investigated by using solid-gas reactions under a sulfidizing gas mixture that contained a gas mixture of carbonyl sulfide, COS, carbon disulfide, CS2 and sulfur Si. The greenockite ... -
The effect of alkali concentration and solid/liquid ratio on the hydrothermal synthesis of zeolite NaA from natural kaolinite
(Elsevier Science Bv, 2005)Zeolite NaA and hydroxy sodalite materials were synthesized successfully by hydrothermal method using the natural kaolinite. In the first step, kaolinite has been calcined at 600 degrees C for 2 h. IR spectra and DTA-TG ... -
Adsorption of CTAB onto perlite samples from aqueous solutions
(Academic Press Inc Elsevier Science, 2005)In this study, the adsorption properties of unexpanded and expanded perlite samples in aqueous cetyltrimethylammonium bromide (CTAB) solutions were investigated as a function of ionic strength, pH, and temperature. It was ... -
Investigation of dissociation properties of oxalic acid-solvent systems by UV-spectrophotometry
(Elsevier Science Bv, 2005)In this study, the UV absorbance of oxalic acid that change with temperature and concentration in the dissociation media was investigated. For every solution system, the relationships between absorbance, A, and concentration, ... -
Adsorption of cationic polyacrylamide onto kaolinite
(Elsevier Science Bv,, 2005)The adsorption of the cationic polymer, polyacrylamide (PAM), onto kaolinite was investigated. Polyacrylamides are among the most commonly used polymers in industry and adsorption of PAM onto kaolinite from aqueous solutions ... -
Carbonic anhydrase inhibitors: Inhibition of the tumor-associated isozymes IX and XII with a library of aromatic and heteroaromatic sulfonamides
(Pergamon-Elsevier Science Ltd, 2005)The inhibition of the two transmembrane, tumor-associated isozymes of carbonic anhydrase (CA, EC 4.2.1.1) of human origin, hCA IX and XII, with a library of aromatic and heteroaromatic sulfonamides has been investigated. ... -
Some kinetic properties of polyphenol oxidase obtained from various Salvia species (Salvia viridis L., Salvia virgata Jacq. and Salvia tomentosa Miller)
(Sage Publıcatıons Ltd, 1, 2003)Polyphenol oxidase (PPO) was partially purified by (NH4)(2)SO4 precipitation followed by dialysis from different organs of Salvia species (Salvia virgata Jacq., Salvia viridis L. and Salvia tomentosa Miller). Polyphenol ... -
Solvents effect on infrared spectra of 1,3-indanedione in organic solvents
(Elsevier Science Bv, 2005)Infrared spectroscopy studies of 1,3-indanedione (ID) in 16 different pure organic solvents were undertaken to investigate the solvent-solute interactions and to correlate solvent properties, such as the Kirkwood-Bauer-Magat ...
