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Öğe N-[4-(3-methyl-3-mesityl-cyclobutyl)-thiazol-2-yl]-succinamic acid: X-ray structure, spectroscopic characterization and quantum chemical computational studies(Elsevier Science BV, 2013) Şen, Fatih; Dinçer, Muharrem; Çukurovalı, Alaaddin; Yılmaz, İbrahimThe aim of this study is to present results of a detailed investigation of the title compound,N-[4-(3-methyl-3-mesityl-cyclobutyl)-thiazol-2-yl]-succinamicacid (C21H26O3N2S). The compound was preparedin the laboratory and crystallized in the monoclinic space group P3 witha=b= 22.4066 (5) Å,c= 8.0744(2) Å,c= 120, andZ= 6. The molecule characterized by experimental methods such as1H NMR,13C NMR,IR and single-crystal X-ray diffraction. The molecular geometry, vibrational frequencies, gauge includingatomic orbital (GIAO)1H and13C NMR chemical shift values of the title compound in the ground state wasoptimized quantum chemistry methods(Hartree–Fock (HF) and density functional method (DFT) (B3LYP)with 6-31G(d,p) basis set). In order to identify low energy conformation, molecular energy profile of thetitle molecule was obtained by semi-empirical quantum chemistry method (AM1) calculations withrespect to a selected degrees of torsional freedom, which were varied from 180°to +180°in steps10°. In addition to the molecular electrostatic potential (MEP), frontier molecular orbital (FMO) and Mul-liken population analysis of the title compound were investigated by theoretical calculation results.Öğe Synthesis of Amine Functionalized Naphthalene Containing Conducting Polymer as a Matrix for Biomolecule Immobilization(Yayıncı Yok, 2013) Azak, Hacer; Yıldız, Hüseyin Bekir; Demirkol, Dilek Odacı; Can, Ümmügülsüm; Talaz, Oktay; Timur, SunaDTP (polydithienopyrroles) have been investigated as a new unit in conjugated materials because of its planar structure, extended -conjugation across the fused rings and N-H bond. Generally Nsubstituted dithione [3,2-b:2’,3’-d] pyroles (DTPs) are precursors for conducting polymers[1].Öğe Photonic ‘‘Wiring’’ of Enzymes With Electrodes For Photobiofuel Cells(Yayıncı Yok, 2013) Yıldız, Hüseyin Bekir; Tel-Vered, Ran; Yi-Ming, Yan; Willner, Itamar; Talaz, OktayDespite the numerous studies on photochemically induced electron transfer in proteins [1], there is no precedence for the photonic wiring of redox enzymes with electrodes and their bioelectrocatalytic activation. The use of enzymes in fuel-generating solar cells has been discussed previously [2].Öğe Synthess of Aniline Funtionalized Ruthenium Dyes for Using Visible Light Water Splitting with Solar Cell(COST, 2012) Talaz, Oktay; Yıldız, Hüseyin BekirDye sensitized solar cells (DSCs) provide a technically and economically credible alternative for increasing energy demands and concerns over global warming. Dye sensitized solar cells (DSCs) based on the ruthenium(II) dyes have high thermal and chemical stability [1].Öğe Solar Cells with Overall Water Splitting Using Oligoaniline-Crosslinked [Ru(bpy)2(bpyCONHArNH2)]+2 Dye/Iridium Oxide Nanoparticle Arrays On Three–Dimensionally Ordered Macroporous Gold-Nanoparticle Doped Titanium Dioxide (3-DMGN-TiO2) Photonic Crystals Modified Electrodes(COST, 2012) Yıldız, Hüseyin Bekir; Talaz, OktayThis project aims the construction of photoelectrochemical cell system splitting water into hydrogen and oxygen using UV vis light under constant applied voltage.Öğe Synthesis of Polymerizable Benzene Containing Ruthenium Dyes For Using Visible Light Water Splitting With Solar Cell(POLYCHAR 22 World Forum on Advanced Materials, 2014) Talaz, Oktay; Yıldız, Hüseyin BekirRuthenium dye-sensitized solar cells alternative for increasing energy demands and concerns over global warming. Ruthenium dye-sensitized solar cells based on the ruthenium(II) dyes have high stability [1]. Dye-sensitized solar cells (DSCs) based on the ruthenium(II) dyes have been shown to be very efficient candidates for photovoltaic technology due to their high stablity and outstanding chemical, physical properties and good response to natural visible sunlight. Ruthenium(II) dyes has to interact with the semiconductor, and thus a range of attaching functionalities have been screened [2] thus we will use polymerizable benzene functionalized ruthenium (5) dyes for using visible light water splitting. FigÖğe Photo-Electrochemical Communication Between Cyanobacteria and Osmium Redox Polymer Modified Electrodes(Yayıncı Yok, 2013) Hasan, Kamrul; Yıldız, Hüseyin Bekir; Sperling, Eva; Packer, Michael A.; Leech, Donal; Hagerhall, Cecilia; Gorton, LoMost of the energy for all forms of life in the world originates from the sun, the ultimate energy source. Photosynthesis is the process by which green plants, algae and some bacteria convert sunlight into chemical energy with a quantum yield of about 100% [1]. Cyanobacteria, also called blue green algae, account for 20-30% of the primary photosynthetic activity on earth. The electrogenic conduit of cyanobacteria might be exploited to develop light sensitive devices that can convert solar energy into electricity [2]. Recently Rhodobacter capsulatus, the metabolically versatile purple bacteria, was shown to communicate with osmium redox polymer modified graphite electrodes [3].Öğe Preparation and Application of Aptamer-modified Water Soluble Quantum Dots for Detection of Pathogens(Yayıncı Yok, 2013) Seleci, M.; Ağ, D.; Doğan, L. Eral; Özçelik, S.; Yıldız, Hüseyin Bekir; Demirkol, Dilek Odacı; Timur, S.Rapid, selective and sensitive detection of pathogens is essential for medical technology, disease control and food safety. Traditional methods for pathogen detection are polymerase chain reaction (PCR), fluorescence-based assays, culture and colony counting. In this context, biosensors offer several advantages like high-throughput screening, improved detectability, label-free detection, real-time analysis over existing techniques [1]. Various types of biological molecules such as enzymes, microorganisms, antibodies and DNA can be used to fabricate biosensors. Among of them antibodies and newly aptamers has been great attention to construct pathogen detection technologies. Antibody-based sensors permit the rapid and sensitive analysis of a range of pathogens and associated toxins [2]. Aptamers are short oligonucleotides that are capable to selectively bind their corresponding target. Therefore, they can be thought of as nucleic acid-based alternative to antibodies. The design of aptamers is simple and takes short time, however antibodies are expensive and their preparation takes long time.Öğe Entrapment Of Tyrosinase In A Redox Polymer(ISPAC 2012, 2012) Yıldız, Hüseyin Bekir; Castillo, Jaime; Guschin, Dmitrii A.; Schuhmann, Wolfgang; Toppare, LeventAn amperometric biosensor for the detection of phenolic compounds was developed based on the immobilization of tyrosinase within an Os-complex functionalized electrodeposition polymer. Integration of tyrosinase within the redox polymer assures efficient catechol recycling between the enzyme and the polymer bound redox sites. The non-manual immobilization procedure improves the reproducibility of fabrication process, greatly reduces the desorption of the enzyme from the immobilization layer, and, most importantly prevents fast inactivation of the enzyme by its substrate due to fast redox cycling. A two-layer sensor architecture was developed involving ascorbic acid oxidase entrapped within an electrodeposition polymer in a second layer on top of the redox polymer=tyrosinase layer. Using this sensor architecture it was possible to eliminate the current interference arising from direct ascorbate oxidation up to a concentration of 630 mM ascorbic acid. The effects of the polymer thickness, the enzyme=polymer ratio, and the applied potential were evaluated with respect to optimal sensor properties. The sensitivity of the optimized sensors for catechol was 6.1 nA mM_1 with a detection limit of 10 nM, and for phenol 0.15 nA mM_1 with a detection limit of 100 nM.Öğe Electrochemical, photoelectrochemical, and piezoelectric analysis of tyrosinase activity by functionalized nanoparticles(NanoTR VII, 2011) Yıldız, Hüseyin Bekir; Freeman, Ronit; Gill, Ron; Willner, ItamarThe electrochemical and photoelectrochemical detection of tyrosinase (TR) activity (an indicative marker for melanoma cancer cells) is reported, using Pt nanoparticles (NPs) or CdS NPs as electrocatalytic labels or photoelectrochemical reporter units. The Pt Nps or CdS NPs are modified with tyrosine methyl ester, capping layer. Oxidation of the capping layer by TR/O2 yields the respective L-DOPA and dopaquinone products. The reduction of the resulting mixture of products with citric acids yields the L-DOPA derivative, as a single product. The association of the L-DOPA derivative funtionalized Pt NPs or CdS NPs to a boronic acid monolayer-modified electrode enables the electrochemical transduction of H2O2 or the photoelectrochemical transduction of TR activity by the generation of photocurrents in the presence of triethanolamine as a sacrificial electron donor. The detection limits for analyzing TR corresponds to 1 U and 0.1 U by the electrochemical and photoelectrochemical methods, respectively. The association of the Pt NPs or CdS NPs to the functionalized monolayer electrode is followed by quartz crystal microbalance measurements.
