Güncel Gönderiler: Fen Fakültesi
Toplam kayıt 2379, listelenen: 341-360
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A semi-empirical and density functional theory study of 2,2',3,4-tetrahydroxy-3'-sulpho azobenzene derivatives and their zirconium complexes
(2013)In this study, certain theoretical properties of three tetrahydroxyazo derivatives and their zirconium complexes, such as stability, reactivity, geometry and energy have been calculated by MOPAC2009 with the PM6 method and ... -
Spectrophotometric determination of the acidity dissociation constants of symmetric Schiff base derivatives
(Gazi University Eti Mahallesi, 2014)In this study, the acidity constants of series symmetric Schiff base derivatives have been determined using the UV-visible spectrophotometric method at a temperature of 25(±0.1) °C. The deprotonated acidity constants (pKa) ... -
Rapid direct spectrophotometric determination of zirconium(IV) in alloys with 2,2/,3,4-tetrahydroxy-3/-sulpho-5/-carboxyazobenzene reagent
(2011)In this study, 2, 2', 3, 4-tetrahydroxy-3'-sulpho-5'-carboxyazobenzene (tetrahydroxyazon SC) has been synthesized for the first time and used for direct spectrophotometric determination of zirconium(IV). Tetrahydroxyazon ... -
Antimicrobial, genotoxic and acute toxic effects of newly synthesized N-Pyridine schiff base derivatives
(2013)Nine N-pyridine Schiff bases (1-9) that were synthesized by reacting different ortho-, meta- and ortho-metasubstituted salicylaldehyde and 3,5-substituted aminopyridine were evaluated for their antimicrobial activity. The ... -
3-[(5-Chloro-2-hydroxybenzylidene)amino]-2-sulfanylidene-1, 3-thiazolidin-4-one
(2013)In the title compound, C10H7ClN2O2S2, the mean plane of the thioxothiazolidine ring [maximum deviation = 0.032 (2) Å] is inclined to the benzene ring by 12.25 (4)°. There is a strong intramolecular O - H...N hydrogen bond ... -
Determination of oxalate ion in bayer liquor using electrochemical method
(2011)The Bayer process can be summarized as the digestion of bauxite with caustic liquor and the subsequent precipitation of hydrated alumina [1]. Most bauxite contains organic compounds in various amounts. Depending upon the ... -
Synthesis of some alkylaminothiophene derivatives from 3,4-dibromothiophene and their theoretical calculations
(Elsevier Ltd, 2019)In this study, the copper catalyzed amination reactions of 3,4-dibromothiophene with some primary, cyclic and acyclic secondary amines were investigated to prepare novel electron rich-thiophenes which are expected to be ... -
Reaktif organobentonit katkıların sert poliüretan köpüğün bazı performans özellikleri üzerine etkisi
(Gazi Universitesi Muhendislik-Mimarlik, 2017)Bu çalışmada; bentonit, amin ve hidroksil fonksiyonelliğine sahip bileşikler ile modifiye edilmiş ve elde edilen organobentonitler sert poliüretan köpük nanokompozit (SPKN) sentezinde katkı olarak kullanılmışlardır. ... -
Metal chelate based site recognition of ceruloplasmin using molecularly imprinted polymer/cryogel system
(Taylor and Francis Inc., 2019)In the present study, N-Acetylneuraminic acid (NANA)-imprinted poly(2-hydroxyethyl methacrylate-N-methacryloyl-(L)-histidin-Cu(II)) p(HEMA-(MAH) 2 -Cu(II)) has been synthesized by radical polymerization for site recognition ... -
Biomimetic Imprinted Polymers: Theory, Design Methods, and Catalytic Applications. Theory, Design Methods, and Catalytic Applications
(Elsevier Inc., 2015)The development of novel and efficient biomimetic materials able to exhibit high catalytic activity is a massive challenge in synthetic chemistry. Natural enzymes have ability to catalyze chemical reactions with high ... -
Validated UV-Vis Spectrophotometric Method for the Determination of Copper using 2,3,4,6/-Tetrahydroxy-3/-Sulfoazobenzene in Real Samples
(Chemical Society of Pakistan, 2018)A selective and sensitive spectrophotometric method has been proposed for the determination of copper by forming red-brown chelate at pH 3.5 (3-4) with 2,3,4,6/-tetrahydroxy-3/-sulfoazobenzene (THSA). Molar absorptivity ... -
Egg shell powder added rigid polyurethane foams: The investigation of their thermal conductivity, compressive strength and fire behaviors [Yumurta Kabuğu Tozu Katkılanmış Sert Poliüretan Köpükler: Termal İletkenlik, Basma Mukavemeti ve Yanma Davranışlarının İncelenmesi]
(Turk Isı Bilimi ve Teknigi Dernegi, 2018)In this study, rigid polyurethane foam composites (SPKK's) containing egg shell powder (YKT) with different ratio were synthesized. YKT was characterized by using X-ray difractometer (XRD), X-ray fluorescence spectrometer ... -
4-Methyl-N-(4-methylphenylsulfonyl)-N-phenylbenzenesulfonamide
(2014)The whole molecule of the title compound, C20H 19NO4S2, is generated by twofold rotational symmetry. The N atom is located on the twofold rotation axis and has a trigonal-planar geometry. It is bonded by two S atoms of two ... -
Crystal structure of 2-[2-(2-aminophenoxy)ethoxy]-N-[(1E)-2,3,5,6,8,9,11,12-octahydro-1,4,7,1 0,13-benzopentaoxacyclopentadecin-15-ylmethylene]aniline
(Japan Society for Analytical Chemistry, 2006)The title compound, C29H34N2O7, is a substituted monotopic benzo-15-crown-5-ether ligand. It belongs to the space group P21/a with cell parameters a = 8.9857(6), b = 25.0353(17), c = 12.6979(9)Å and ß = 109.730(1)o. The ... -
Separation of catechins and methylxanthines in tea samples by capillary electrochromatography
(2009)In this paper, the simultaneous separation of several polyphenols such as (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, theophylline, caffeine in green and black teas by capillary electrochromatography (CEC) was ... -
The synthesis, characterization and structural analysis of a Co(III) complex of 1,10-phenanthroline and perfluorosebacic acid, [Co(HL)(phen) 2(H2O)]L·H2O
(Verlag der Zeitschrift fur Naturforschung, 2006)The hexacoordinated mononuclear Co(III) complex 1, [Co(HL)(phen) 2(H2O)]L·H2O, with the mixed ligands (H2L = HO2C(CF2)8CO2H and 1,10-phenantroline) has been synthesized and characterized by elemental analysis, IR and UV/vis ... -
Selective solid-phase extraction of Cd(II) using double imprinting strategy
(2010)Molecular imprinting technology is a strategy for producing chemically selective binding sites, which recognize a particular molecule, in a macroporous polymer matrix. Molecular recognition-based separation techniques have ... -
Evaluation of polymer-supported rhodium catalysts in 1-octene hydroformylation in supercritical carbon dioxide
(American Chemical Society, 2003)Supercritical CO2 has been used as a benign solvent in the hydroformylation of 1-octene using a Rh-based catalyst. The catalyst is attached to a polymer backbone that has fluoroacrylate branches that make it soluble in ... -
Reverse atom transfer radical polymerization of stearyl methacrylate using 2,2'-azobisisobutyronitrile as the initiator
(2002)The living/controlled radical polymerization of stearyl methacrylate was carried out with a conventional radical initiator (2,2'-azobisisobutyronitrile) in N,N-dimethylformamide in the presence of a 2,2'-bipyridine complex ... -
Amino acid conjugated self assembly molecules modified Si wafers [Amino asit konjuge kendili?inden düzenlenen moleküller ile si pulcuklari{dotless}n modifikasyonu]
(Institute of Electrical and Electronics Engineers Inc., 2003)In this study, Si wafer surface was modified with newly synthesized self-assembled monolayers to mimic a biocompatible micro-environment for the cells and to observe their behavior. Begin with; Si wafer is chosen as its ...
