1,720,988 research outputs found
Phthalocyanines containing resorcinarene cavitands; synthesis and heavy metal ion extraction properties
Full text linkkantar, cihan/0000-0002-5234-0782There are several studies about phthalocyanines containing resorcin[4]arene groups at literature. However, their heavy metal ion extraction properties are unknown. Therefore, the novel phthalocyanines containing tetra and octa resorcin[4]arene cavitands were synthesized and investigated extraction properties for some environmentaly important heavy metal ions. the structures were characterized by elemental analysis, H-1 NMR, C-13 NMR, UV/vis and FT-IR spectroscopy techniques. the extraction capacities were analyzed through liquid-liquid extraction method. the novel phthalocyanine compounds TP5ZnPc and TP6ZnPc seem to be proper for the removal of heavy metal cations.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [215Z438]This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK, Project no: 215Z438)
Microwave-Assisted Synthesis, Characterization and Aggregation Properties of Phthalocyanines Containing Azo Dye
Full text linkkantar, cihan/0000-0002-5234-0782The new zinc phthalocyanines substituted with azo compound are described. Firstly, azo compound (I) was synthesized by treating phenol with 4-iodoaniline. Then phthalonitrile compounds (1, 2 and 3) were synthesized by nucleophilic aromatic substitution. At the last step, novel zinc phthalocyanines (1a, 2a and 3a) were synthesized by the microwave irradiation. the microwave-assisted synthesis method reduces reaction times and enhances the yield of the reactions. All phthalocyanine compounds are soluble in DMF and DMSO. the structures were confirmed by elemental analysis, H-1 NMR, C-13 NMR, UV/visible, IR and mass spectra. Aggregation properties of phthalocyanines were investigated at different concentrations in DMSO (for 1a) and CHCl3 (for 2a and 3a)
Microwave-assisted synthesis, characterization and aggregation properties of novel metallophthalocyanines containing 2-aminothiophenol moieties
No full textkantar, cihan/0000-0002-5234-0782; Sasmaz, Selami/0000-0001-5311-7550The microwave-assisted synthesis and characterization of novel peripherally 2-aminothiophenol substituted metallophthalocyanines (M: Ni(II), Zn(II)) have been reported for the first time in this study. All the new compounds were characterized by a combination of FT-IR, H-1-NMR, C-13-NMR, and UV/vis spectroscopy techniques. the crystal structure of compound (1) was also determined by the single crystal diffraction technique. Aggregation properties of metallophthalocyanines were investigated at different concentrations in DMSO
Microwave-assisted synthesis, characterization and spectral properties of non-peripherally tetra-substituted phthalocyanines containing eugenol moieties
No full textSasmaz, Selami/0000-0001-5311-7550; kantar, cihan/0000-0002-5234-0782The microwave-assisted synthesis and characterization of novel non-peripherally eugenol substituted metallophthalocyanines (M: Co(II), Ni(II), Cu(II), Zn(II)) have been reported for the first time in this study. All the new compounds were characterized by a combination of FT-IR, H-1 NMR, C-13 NMR, and UV/vis spectroscopy techniques. the crystal structure of compound (1) was also determined by the single crystal diffraction technique. Newly synthesized eugenol substituted phthalocyanines have more redshift Q bands (about 17-18 nm) than previously reported eugenol substituted phthalocyanines. Zinc(II)phthalocyanine (1d) has an extra absorption band at 746 nm that calling "X band" at UV/vis spectrum. (C) 2015 Elsevier B.V. All rights reserved.Recep Tayyip Erdogan UniversityRecep Tayyip Erdogan University [2014.102.02.04]This work was supported by Recep Tayyip Erdogan University (Project No: 2014.102.02.04)
Some azo dyes containing eugenol and guaiacol, synthesis, antioxidant capacity, urease inhibitory properties and anti-helicobacter pylori activity
No full textSasmaz, Selami/0000-0001-5311-7550; kantar, cihan/0000-0002-5234-0782There are many studies about azo compounds at literature. However, antioxidant capacity, urease inhibitory and anti-Helicobacter pylori activity properties are not well known. Therefore, some azo dyes containing eugenol and guaiacol were synthesized by coupling reactions of different amines with eugenol and guaiacol, respectively. the newly synthesized compounds were screened for their antioxidant properties by employing three in vitro assays like 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay, 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) assay and CUPric Reducing Antioxidant Capacity (CUPRAC). All compounds were assayed for inhibitory effect against urease and Helicobacter pylori growth in vitro. These results suggest that compounds 1, 5, 6 and 7 can be novel urease inhibitory and anti-Helicobacter pylori agent.Recep Tayyip Erdogan University Scientific Research Project Units [2015.53007.102.02.02]This study was supported by the Recep Tayyip Erdogan University Scientific Research Project Units (Project No: 2015.53007.102.02.02)
Synthesis, spectroscopic and structural studies of 4-Amino-3-(ethyl)-5-(4-chlorophenyl)-4H-1,2,4-triazole and 4-Amino-3-cyclopropyl-5-oxo-4,5-dihydro-1,2,4-triazole-1-yl-acetic acid ethyl ester
No full textkantar, cihan/0000-0002-5234-0782; Sasmaz, Selami/0000-0001-5311-7550; Sahin, Onur/0000-0003-3765-3235The title compounds of 4-Amino-3-(ethyl)-5-(4-chlorophenyl)-4H-1,2,4-triazole (I, C10H11ClN4) and 4-Amino-3-cyclopropyl-5-oxo-4,5-dihydro-1,2,4-triazol-1-yl-acetic acid ethyl ester (II, C9H14N4O3), have been determined using X-ray diffraction techniques and characterized by IR, H-1 NMR and C-13 NMR. X-ray study shows that the title compounds both have strong intermolecular N-H center dot center dot center dot N hydrogen bonds. the molecules of! are linked into a two-dimensional framework structure by N-H center dot center dot center dot N and C-H center dot center dot center dot N hydrogen bonds which produce R-2(2)(8)R-4(4)(14)R-4(4)(15) chain of rings, while in II, the combination of N-H center dot center dot center dot N, N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds along [100] generates a chain of edge-fused R-2(2)(10)R-2(2)(16)R-4(2)(14)R-4(4)(14) rings. (C) 2014 Elsevier B.V. All rights reserved
Novel zinc(II)phthalocyanines bearing azo-containing schiff base: Determination of pKa values, absorption, emission, enzyme inhibition and photochemical properties
No full textSasmaz, Selami/0000-0001-5311-7550; kantar, cihan/0000-0002-5234-0782Azo-containing schiff bases are well known and there are many studies about their various properties in literature. However, phthalocyanines bearing azo-containing schiff bases, their spectral, analytical and biological properties are unknown. Therefore, new zinc (II) phthalocyanines bearing azo-containing schiff base were synthesized and investigated to determine pKa values, absorption, emission, enzyme inhibition and photochemical properties. Emission spectra were reported and large Stokes shift values were determined for all compounds, indicating that all molecules exhibit excited state intramolecular proton transfer. These phthalocyanines were the first examples of phthalocyanine showing excited state intramolecular proton transfer. Singlet oxygen quantum yields of zinc (II) phthalocyanines were determined. pKa values and indicator properties of all compounds were investigated by potentiometry. All compounds were assayed for inhibitory activity against bovine milk xanthine oxidase and acetylcholinesterase enzyme in vitro. Compound 2 showed the high inhibitory effect against xanthine oxidase (IC50 = 0.24 +/- 0.01 mu M). However, phthalocyanine compounds did not show enzyme inhibitor behavior. (C) 2016 Elsevier B.V. All rights reserved
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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