Yazar "Alici, Onder" seçeneğine göre listele

Listeleniyor 1 - 10 / 10
  • Küçük Resim Yok
    Öğe
    4-tert-butylcalix[4]arene having nitrile pendant groups as Hg2+ selective receptors
    (ELSEVIER SCIENCE BV, 2013) Tabakci, Begum; Alici, Onder; Karatas, Ibrahim
    We synthesized a series of 4-tert-butylcalix[4]arene nitriles (5-7) by the reaction of 4-tert-butylcalix[4]arene (1) with 4'-(6-bromohexyloxy)biphenyl-4-carbonitrile (2), 4'-(10-bromode-cyloxy)biphenyl-4-carbonitrile (3), and 4'-(12-bromododecyloxy)biphenyl-4-carbonitrile (4) and characterized their structures, respectively. The extraction abilities of newly synthesized 5-7 toward some selected heavy metal cations, such as Co2+, Cu2+, Ni2+, Zn2+, Cd2+, and Hg2+, were first evaluated and compared by the solvent extraction method. The extraction results revealed that 5-7 were efficient and selective cation receptors for Hg2+ over-selected cations. On the other hand, the complexation behavior of Hg2+ with 5-7 was also investigated by using NMR, UV-vis, and IR spectroscopic methods. (C) 2012 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    A cyanobiphenyl containing fluorescence "turn on" sensor for Al3+ ion in CH3CN-water
    (ELSEVIER SCIENCE SA, 2015) Alici, Onder; Erdemir, Serkan
    A novel fluorescent sensor, 4'-hydroxy-3'-(((2-hydroxyphenyl)imino)methyl)-4-biphenylcarbonitrile (AAF) was synthesized and characterized by combination of H-1, C-13, APT, COSY NMR, FT-IR, and elemental analysis. The behaviors of the receptor AAF toward different metal ions were determined by UV-vis and fluorescence spectroscopy. The receptor AAF exhibited a 24-fold increase in fluorescence intensity in the presence of Al3+ over most other competitive metal ions in CH3CN-water (v/v, 1/1). (C) 2014 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    A highly selective and sensitive benzothiazole-based 'turn-on' fluorescent sensor for Hg2+ ion
    (WILEY, 2015) Erdemir, Serkan; Malkondu, Sait; Alici, Onder
    A simple benzothiazole-based fluorescent probe (TDA) for the determination of Hg2+ ion in aqueous solutions was synthesised in one step and characterised by H-1 NMR, C-13 NMR, APT, COSY, FTIR, and elemental analysis. TDA shows a significant fluorescence change upon the interaction of Hg2+ ion in DMF-water (v/v=1/1), while only minor changes in fluorescence intensity are observed with 18 other metal ions. Fluorescence enhancement by a factor of 15 is achieved upon selective interaction with Hg2+ ion. The Hg2+ ion detection process is found to be pH dependent; therefore, TDA could be feasible within a pH range of 4.0-7.0.
  • Küçük Resim Yok
    Öğe
    'Naked-eye' detection of F- ions by two novel colorimetric receptors
    (PERGAMON-ELSEVIER SCIENCE LTD, 2013) Erdemir, Serkan; Kocyigit, Ozcan; Alici, Onder; Malkondu, Sait
    Two novel colorimetric receptors, S1 and S2, linked to one or two nitrophenylurea groups were synthesized in good yields, characterized and their chromogenic properties investigated towards various anions (F-, Cl-, Br-, I-, NO3-, AcO-, ClO4-, HSO4-, and H2PO4-) by UV-vis and H-1 NMR techniques. The receptors, effectively and selectively, recognized and distinguished the biologically important F- from other anions such as Cl-, Br-, I- etc. in CH3CN. This selectivity could be easily observed by the naked eye, indicating that receptors S1 and S2 are potential colorimetric sensors for fluoride ion. (c) 2012 Elsevier Ltd. All rights reserved.
  • Küçük Resim Yok
    Öğe
    A novel colorimetric and fluorescent sensor based on calix[4]arene possessing triphenylamine units
    (PERGAMON-ELSEVIER SCIENCE LTD, 2013) Erdemir, Serkan; Malkondu, Sait; Kocyigit, Ozcan; Alici, Onder
    A novel colorimetric and fluorometric calix[4]arene probe (CTP) bearing triphenylamine units was synthesized in good yield and characterized by combination of H-1, C-13, APT, COSY, FTIR, HRMS, and UV-vis spectral data. Ion-binding studies of CTP were investigated in acetonitrile with a wide range of cations and anions and the recognition process was monitored by luminescence, UV-vis and H-1 NMR spectral changes. CTP exhibited naked eye detection for Hg2+ ion. Also it showed a significant fluorescence quenching towards F- ion. (C) 2013 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Novel liquid crystal aldoximes and aldoxime ethers: Synthesis, characterization and liquid crystal behavior
    (ELSEVIER SCIENCE BV, 2016) Alici, Onder; Karatas, Ibrahim
    This study describes synthesis and characterization of new liquid crystal aldoximes and aldoxime ethers in detail. Firstly, 4'-(6-bromohexyloxy)bipheny1-4-carbonitrile, 4'-(8-bromooctylox)bipheny1-4-carbonitrile and 4'-(10-bromoodecyloxy)bipheny1-4-carbonitrile derivatives were synthesized, respectively. Then, with this compound, condensation reaction was determined to p-hydroxybenzaldehyde and new aldehyde derivatives were synthesized. This aldehyde derivatives were converted to new oxime derivatives, not found in the literature. Then, these new oxime derivatives were converted to oxime ether derivatives with iodomethane. All of the obtained products were characterized by a combination of FT-IR, H-1 NMR,C-13 NMR and elemental analysis. Then, the liquid crystal properties of these new compounds were determined by using DSC and POM techniques. (C) 2015 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    A novel tripodal colorimetric and fluorescence "turn on" chemosensor for AcO- and F- anions in CH3CN
    (PERGAMON-ELSEVIER SCIENCE LTD, 2016) Alici, Onder
    A novel chemosensor, 3',3''',3''' ''-(((nitrilotris(ethane-2,1-diyl))tris(azanylylidene))tris(methanylylidene))tris(4-hydroxy-4'-biphenylcarbonitrile) (L) was synthesized and characterized by the combination of H-1,C-13, APT, COSY NMR, FT-IR, and elemental analysis. The behavior of the receptor (L) toward different anions was investigated using UV-visible and fluorescence spectroscopy. The receptor (L) indicated an efficient colorimetric "naked-eye" and "turn on" fluorescent response for fluoride and acetate in CH3CN, respectively. (C) 2016 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Sorption and kinetic properties of 2-(biphenyl-4-yl)-2-oxoacetaldehyde oxime towards Zn(II) ion
    (DESALINATION PUBL, 2013) Alici, Onder; Akin, Ilker
    This study contains the synthesis of 2-(biphenyl-4-yl)-2-oxoacetaldehyde oxime (keto oxime) and its sorption studies towards Zn(II) ions in aqueous solution. In batch sorption experiments, the experimental results show that keto oxime is an effective sorbent towards Zn(II) ions. Therefore, the effects of solution pH, sorption time, temperature, and initial metal ion concentration on Zn(II) sorption were investigated. Maximum Zn(II) ions removal was obtained at 65 degrees C, for 75 min and at pH 5.0 for keto oxime and the batch sorption capacity was found as 1.00 mmol/g. The characteristics of the sorption process for Zn(II) ions were evaluated by using the Langmuir and Freundlich adsorption isotherms. Also, thermodynamic parameters, i.e. Delta G, Delta S, and Delta H were calculated for the system.
  • Küçük Resim Yok
    Öğe
    Synthesis of a new colorimetric receptor based on calix[4]pyrrole binding oxime for selective recognition of fluoride ions
    (TAYLOR & FRANCIS LTD, 2014) Taner, Bilge; Alici, Onder; Deveci, Pervin
    A colorimetric anion sensor -meso-heptaethylcalix[4]pyrrole-meso-3-aminophenyl-p-nitrobenzaldoxime was synthesised and characterised by various spectroscopic techniques. Anion-binding studies were carried out using UV-vis, and H-1 NMR titrations, revealing that the receptor exhibits selective recognition towards F- over other anions. The selectivity for F- among the halides is attributed mainly to the hydrogen bond interaction of the receptor with F-. Receptor showed colour change from colourless to yellow in the presence of tetrabutylammonium fluoride with 1:2 stoichiometry. Cyclic voltammetry studies, carried out in CH3CN, provided evidence of an anion-dependent electrochemical response with F- ion. This response was particularly dramatic in the case of receptor after the addition of approximate to 1equiv. of F- ion.
  • Küçük Resim
    Öğe
    Synthesis of New Substituted 1,2,4-Triazines from Isonitrosoketones and Terephthalaldehydedihydrazone
    (WILEY-BLACKWELL, 2012) Alici, Onder; Karatas, Ibrahim
    This study describes a novel method for the synthesis of 1,2,4-triazines. Firstly, isonitrosoacetophenone, p-methylisonitrosoacetophenone, and isonitroso-1-acetylnaphthalene were synthesized from the reaction of butylnitrite with acetophenone, p-methylisonitrosoacetophenone, and 1-acetylnaphthalene, respectively. Then, symmetric derivatives of 1,2,4-triazines were prepared from the condensation reaction of keto oximes with terephthalohydrazone. However, the heteroaromatic closure was not observed in the condensation reaction of pyruvic-aldehyde-1-oxime(keto oxime) with terephthalohydrazone. Structures of the obtained products were confirmed by FTIR, 1H-NMR, and elemental analyses techniques.