Kimya / Chemistry: Recent submissions

Now showing items 1-20 of 756

An application of derivative and continuous wavelet transforms to the overlapping ratio spectra for the quantitative multiresolution of a ternary mixture of paracetamol, acetylsalicylic acid and caffeine in tablets

Özdemir, Abdil (ELSEVIER SCIENCE BV, 2005)

Quantitative multi resolution of tablets and ternary mixtures of paracetamol (PAR), acetylsalicylic acid (ASP) and caffeine (CAF) having strongly overlapping spectra was accomplished by two graphical transform methods as ...
UVRR spectroscopic studies of valinomycin complex formation in different solvents

Özdemir, Abdil (PERGAMON-ELSEVIER SCIENCE LTD, 2005)

We investigated the complexation of valinomycin (VM) in different solvent environments with the aid of the UVRR spectroscopy. By probing the 206.5 and 229 nm excited Raman spectra, we showed that new bands are observed ...
A kinetic study of metal complex dye sorption onto pine sawdust

Özacar, Mahmut; Şengil, İsmail Ayhan (ELSEVIER SCI LTD, 2005)

The removal of metal complex dyes, Metal Complex Blue (MCB) and Metal Complex Yellow (MCY), from aqueous solutions by pine sawdust has been studied in single component sorption systems. The aim of this study was to understand ...
(E)-9,10-Dihydro-9-methyl-9-nitro-10(trinitromethyl)anthracene

Arslan, Mustafa (INT UNION CRYSTALLOGRAPHY, 2005)

The title compound, C16H12N4O8, was prepared by the photochemical reaction of 9-methylanthracene and tetranitromethane in dichloromethane. Intermolecula face-to-face pi-pi stacking interactions are present along the a axis.
Column solid phase extraction of gold, palladium and copper at trace levels on modified silica gel for their atomic absorption spectrometric determination

İmamoğlu, Mustafa; Aydın, Ali Osman (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2005)

A method for the preconcentration of Au (III), Pd (II) and Cu (II) is proposed using a minicolumn filled with silica gel modified by 3-[2-(2-aminoethylamino)ethyl-amino]propyl group (AEAEAP-SG). The retained analytes on ...
An environmentally benign synthesis of flavones from 1,3-diketones using silica gel supported NaHSO4 catalyst

Küçükislamoğlu, Mustafa; Nebioğlu, Mehmet; Zengin, Mustafa; Arslan, Mustafa (SCIENCE REVIEWS 2000 LTD, 2005)

A simple and enviromentaly benign method for synthesis of flavones is described via dehydrative cyclisation of o-hydroxydibenzoylmethane using silica gel supported NaHSO4 catalyst.
Use of molecular dynamics to investigate polymer melt-metal wall interactions

Olgun, Uğursoy (ELSEVIER SCI LTD, 2005)

The classical boundary condition of fluid dynamics, i.e. the no-slip condition is violated during the flow of various complex fluids including polymer melts and polymeric suspensions. It is recognized that the dynamics of ...
The stereochemistry of epoxidation of 5 beta-methyl-19-norsteroidal 9,10-alkenes

Yıldırım, Kudret (SCIENCE REVIEWS LTD, 2005)

Crystallographic studies have shown that the oxidation of 3 beta,6 beta-dihydroxy-5 beta-methyl-19-norsteroidal 9(10)-alkenes with chromium trioxide leads to 9 alpha,10 alpha-epoxides as minor products.
Determination of gold, palladium and copper by flame atomic absorption spectrometry after preconcentration on silica gel modified with 3-(2-aminoethylamino)propyl group

İmamoğlu, Mustafa; Aydın, Ali Osman; Dündar, Mustafa Şahin (CENTRAL EUROPEAN SCIENCE JOURNALS, 2005)

A preconcentration method of gold, palladium and copper based on the sorption of Au (III), Pd (II) and Cu (II) ions on a column packed with 3-(2-aminoethylamino)propyl bonded silica gel is described. The modified silica ...
Response to comment on "Two-stage batch sorber design using second-order kinetic model for the sorption of metal complex dyes onto pine sawdust" by Dr. Y.-S. Ho, Biochem. Eng. J. 21 (2004) 39-45

Özacar, Mahmut (ELSEVIER SCIENCE SA, 2005)
Structure of 2,3-exo, exo-5,6-endo, endo- tetrabromonorbornane

Tutar, Ahmet (1998)
Heavy metal contents of indoor airdust particulate matter from Adapazari, Turkey

Dündar, Mustafa Şahin (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2005)

This paper presents heavy metal profiles of indoor dustfall depositions according to collection heights, collection time, heating type, and collection site. The samples were collected from residences located in six different ...
Heavy metal determinations in outdoor atmospheric dust depositions

Dündar, Mustafa Şahin (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2005)

Information on atmospheric dust deposition is important for various types of research, including urban runoff and air quality modelling, ecosystem nutrient cycling and epidemiological studies. This paper presents heavy ...
Determination and analysis of the dispersive optical constants of the 2,9,16,23-tetraneopentoxyphthalocyaninatozinc(II) charge transfer complex with 2,3-dichloro-5,6-dicyano-p-benzoquinone thin film

Arslan, Mustafa; Yıldız, Salih Zeki (ELSEVIER SCIENCE BV, 2005)

Optical characterization of the charge transfer complex of 2,9,16,23-tetra neopentoxyphthalocyaninatozinc(II) with 2,3-dichloro-5,6-dicyano p-benzoquinone (DDQ) has been carried out using the transmittance T(lambda) and ...
Comparative study of the continuous wavelet transform, derivative and partial least squares methods applied to the overlapping spectra for the simultaneous quantitative resolution of ascorbic acid and acetylsalicylic acid in effervescent tablets

Özdemir, Abdil (ELSEVIER SCIENCE BV, 2005)

The simultaneous spectrophotometric determination of ascorbic acid (AA) and acetylsalicylic acid (ASA) in effervescent tablets in the presence of the overlapping spectra was accomplished by the continuous wavelet transform ...
(1RS,2SR)-1,2,4,5,7-pentabromo-5-methoxyindane

Tutar, Ahmet; Çakmak, Ömer (BLACKWELL MUNKSGAARD, 2005)

In the title compound, C10H7Br5O, prepared by bromination of 5- methoxyindane, all bond lengths and angles are in the usual ranges. However, the relatively wide range of Br - C - C angles [ 107.2 ( 5) - 117.0 ( 4)degrees] ...
Adsorption of metal complex dyes from aqueous solutions by pine sawdust

Özacar, Mahmut; Şengil, İsmail Ayhan (ELSEVIER SCI LTD, 2005)

An attempt to alleviate the problem caused by the presence of metal complex dyes, mostly used in textile industries, in the textile effluents was undertaken. The effects of adsorbent particle size, pH, adsorbent dose, ...
Decolorization of CI reactive red 124 using the electrocoagulation method

Şengil, İsmail Ayhan; Özacar, Mahmut (CROATIAN SOC CHEMICAL ENGINEERING TECHNOLOGY, 2004)

The removal of color from synthetic wastewater containing a reactive dye, C.I. reactive red 124, was experimentally investigated using direct current (D.C.) electrocoagulation (EC). In the EC of the reactive dye the effects ...
A water-soluble multisite ionophore ligand bearing pyridine and aminothiophenol functionality. Synthesis, spectroscopy and electrochemistry of its complexes, and peripheral reactivity of the (E,E)M (M = Ni) complex with Pd2+ and Ag+

Kandaz, Mehmet (KLUWER ACADEMIC PUBL, 2004)

The design, synthesis and coordination of a novel multisite vic-dioxime compound, LH2 containing flexible pyridine substituents and amitiophcnylsulfanyl moieties on the periphery, facilitating solubility in water as ...
Separation and concentration of gallium from acidic leach solutions containing various metal ions by emulsion type of liquid membranes using TOPO as mobile carrier

Kumbasar, Recep Ali; Tutkun, Osman (ELSEVIER SCIENCE BV, 2004)

The separation and concentration of gallium from acidic leach solutions, containing various other ions, such as iron, cobalt, nickel, zinc, cadmium, lead, copper, and aluminium, by an emulsion liquid membrane (ELM) technique ...