Chemistry / Kimya
Permanent URI for this collectionhttps://hdl.handle.net/11147/4072
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Article Citation - WoS: 25Citation - Scopus: 20Rhodium-Catalyzed Carbonylative Arylation of Alkynes With Arylboronic Acids: an Efficient and Straightforward Method in the Synthesis of 5-Aryl(Royal Society of Chemistry, 2006) Aksın, Özge; Dege, Nurcan; Artok, Levent; Türkmen, Hayati; Çetinkaya, Bekir; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of Technology5-Aryl-2(5H)-furanones can be synthesized by the Rh-catalyzed reactions of arylboronic acids with internal alkynes under a CO atmosphere.Article Citation - WoS: 83Precipitation of Monodisperse Zno Nanocrystals Via Acid-Catalyzed Esterification of Zinc Acetate(Royal Society of Chemistry, 2006) Demir, Mustafa Muammer; Demir, Mustafa Muammer; Lieberwirth, Ingo; Wegner, Gerhard; 03.09. Department of Materials Science and Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyA wet-chemical method to produce zinc oxide nanocrystals of monodisperse size distribution (diameter range of 20-80 nm) is presented. The synthesis starts from zinc acetate dihydrate which is converted to ZnO in the presence of 1-pentanol in m-xylene at 130 °C. We report for the first time catalysis of this reaction by p-toluene sulfonic acid monohydrate (p-TSA), which allows a shorter reaction time and improves both the reproducibility of the particle size distribution and the crystallinity of the particles. The reaction can be scaled up to give multigram quantities of product per batch. Particles were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and photoluminesence (PL) spectroscopy. Room temperature PL spectra of ZnO prepared without catalyst exhibit a strong and sharp UV emission band at ca. 385 nm and a weak and very broad green-yellow visible emission centered at ca. 550-560 nm. However, for nanoparticles precipitated in the presence of p-TSA, the UV emission is enhanced by a factor of 4, which can be correlated with the improvement of crystal perfection. A particle formation mechanism is discussed.Article Citation - WoS: 89Citation - Scopus: 103Group 15 Quaternary Alkyl Bistriflimides: Ionic Liquids With Potential Application in Electropositive Metal Deposition and as Supporting Electrolytes(Royal Society of Chemistry, 2002) Bhatt, Anand I.; May, Iain; Volkovich, Vladimir A.; Hetherington, Melissa E.; Lewin, Bob G.; Thied, Robert C.; Ertok, Nigar; 01. Izmir Institute of TechnologyThe eletrochemical properties of Group 15 quaternary alkyl bistriflimides salts were reported. The ionic liquids with potential application in electropositive metal deposition when used as supporting electrolytes in MeCN was also discussed. It was found that the three Group 15 based ionic liquids that were prepared have extremely large electrochemical windows.Article Citation - WoS: 47Determination of Technetium in Sea-Water Using Ion Exchange and Inductively Coupled Plasma Mass Spectrometry With Ultrasonic Nebulisation(Royal Society of Chemistry, 1998) Eroğlu, Ahmet Emin; Eroğlu, Ahmet Emin; Leonard, Kinson S.; McCubbin, David; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of TechnologyAn enrichment–separation scheme employing a strong-base type anion-exchange resin was developed for the determination of99Tc in sea-water by inductively coupled plasma mass spectrometry utilising ultrasonic nebulisation with membrane desolvation. Samples were processed through an anion-exchange column to enrich Tc and to eliminate sea-water matrix ions. The limit of detection for 99Tc in sea-water based on processing a 14 ml sample was 0.03 ng l–1. Accuracy was verified with spike recovery experiments. The potential for rapid on-line sample processing via a microcolumn–flow injection system was demonstrated.Article Citation - WoS: 31Citation - Scopus: 32Speciation and Preconcentration of Inorganic Tellurium From Waters Using a Mercaptosilica Microcolumn and Determination by Hydride Generation Atomic Absorption Spectrometry(Royal Society of Chemistry, 2000) Körez, Aslıhan; Eroğlu, Ahmet Emin; Volkan, Mürvet; Ataman, O. Yavuz; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of TechnologyA separation–preconcentration method utilising a mercapto-modified silica microcolumn was developed for the determination of trace amounts of Te(IV) and Te(VI) in waters by hydride generation atomic absorption spectrometry. Bottled drinking water, tap water and sea-water samples were spiked with sub-ng ml−1 concentrations of Te(IV) and the spiked solutions were subjected to the mercapto-modified silica microcolumn separation and enrichment procedure. The spike recovery values varied between 86 and 114%. In addition to spike recovery experiments, accuracy was also verified via the analysis of a certified reference material. The limit of detection for Te(IV) in sea-water with a preconcentration factor of 50 was 0.037 ng ml−1. The capability of the microcolumn enrichment scheme for on-line sample processing via flow manifolds was demonstrated. A detailed interference study was performed.