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Öğe Adsorptive removal of Co(II), Ni(II), and Cu(II) ions from aqueous media using chemically modified sporopollenin of Lycopodium clavatum as novel biosorbent(DESALINATION PUBL, 2014) Cimen, Aysel; Bilgic, Ali; Kursunlu, Ahmed Nuri; Gubbuk, Ilkay Hilal; Ucan, Halil IsmetIn this study, sporopollenin of Lycopodium clavatum spores was used for sorption experiments. (E)-4-((2-hydroxyphenylimino) methyl) benzoic acid (HPBA) immobilized sporopollenin (Sp) was employed as a sorbent in sorption of selected heavy metal ions in aqueous solutions. The sorbent material was prepared with sequential treatment of sporopollenin with silanazing compound and HPBA. Experimental conditions for effective sorption of heavy metal ions were optimized with respect to different experimental parameters using the batch method in detail. pHs for maximum sorption of Cu(II) Ni(II) and Co(II) ions were found in six and five, respectively. Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm equations were applied to the experimental data. Thermodynamic parameters such as free energy (Delta G degrees), entropy (Delta S degrees), and enthalpy (Delta H degrees) were also calculated from the sorption results and were used to explain the mechanism of the sorption. The results indicated that this sorbent is successfully employed in the separation of trace Cu(II), Ni(II), and Co(II) from the aqueous solutions.Öğe Aromatic Chromophore-Tethered Schiff Base Ligands and Their Iron(III)/Chromium(III) Salen and Saloph Capped Complexes(SPRINGER/PLENUM PUBLISHERS, 2012) Obali, Aslihan Yilmaz; Ucan, Halil IsmetAromatic chromophores; pyrene, phenanthrene, anthracene, naphtalene and benzene-tethered Schiff base ligands and their iron(III)/chromium(III) Salen and Saloph capped complexes have been synthesized. Compounds have been characterized by means of FT-IR Spectroscopy, H-1-NMR Spectroscopy, Magnetic Susceptibility, Elementel Analsis, TG/DTA measurements. Their fluorescence and absorbance properties have been investigated by Luminescence Spectroscopy and UV-vis Spectroscopy. Generally, ligands show an intense excimer fluorescence emissions in acetonitrile-methanol medium while iron(III) and chromium(III) complexes exhibit low fluorescence's. Intensity compared to ligands iron and chromium centers act as an extra chromophore that quench the pyrene, phenanthrene, anthracene, naphtalene and benzene molecules' singlet state. The mechanism of quenching is attributed to a iron (or chromium)-to-pyrene (or phenanthrene, anthracene, naphtalene and benzene) electronic energy transfer process.Öğe Design of Azide-substitued Polypyridine Ligand(IEEE, 2017) Ucan, Halil Ismet; Obali, Aslihan YilmazNovel azide-substitued polypyridine ligand, 2(4-(azidomethyl) phenyl)-1H-imidazo[4,5f][1,10] phenanthroline (N3-PPY), and its Ruthenium(II) complexes were synthesized. Their spectroscopic properties were investigated. All starting materials and reagents used were purchased from Sigma Aldrich, Merck and used without further purification. All aqueous solutions were prepared with deionized water that had been passed through a Millipore milli Q Plus water purification system. H-1-NMR spectra were taken using a Varian 400-MHz Spectrometer. FT-IR spectra were recorded using a Perkin Elmer Spectrum 100 FT-IR Spectrometer. Melting points were determined by Buchi Melting Point B-540 instrument. Elemental analyses were carried out using a LECOCHNS-932 elementel analyser.Öğe Dipodal quinoline-tethered fluorescent probe synthesis and investigation of spectroscopic properties(ELSEVIER SCIENCE BV, 2017) Obali, Aslihan Yilmaz; Yilmaz, Menzeher Serkan; Ucan, Halil IsmetNovel quinoline-tethered fluorescent probe was designed and synthesized as multidentate ligand. Their sensing actions were confirmed by UV-Vis absorbance and emission spectroscopic studies in presence of perchlorate salts of Co2+, Li+, Fe2+, K+, Pb2+, Cu2+, Zn2+, Ni2+, Hg2+, Ag+ cations in acetonitrile (1 x 10(-5) M for absorption studies, 1 x 10(-7) M for fluorescence studies). It was found that the dipodal compounds can selectively bind to Cu2+ and Ag+ metal ions with a significant quenching in their emissions. The capture of Cu2+ and Ag+ by the probe resulted in deprotonation of the secondary amine conjugated to the quinoline-tethered probe, so that the electron-donation ability of the 'N' atom would be greatly enhanced and the probe (2) showed blue-shift in emission and exhibited an on-off fluorescent response. The binding study was explored by using fluorescence spectroscopy with Job plot method. (C) 2017 Elsevier B.V. All rights reserved.Öğe A novel Bodipy-Dipyrrin fluorescent probe: Synthesis and recognition behaviour towards Fe (II) and Zn (II)(ELSEVIER SCI LTD, 2012) Kursunlu, Ahmed Nuri; Guler, Ersin; Ucan, Halil Ismet; Boyle, Ross W.We present the design, synthesis, characterization and spectral studies for a new Zn (II) and Fe (II) selective fluorescent probe, 4,4-Difluoro-8-{3-[(4-phenoxy-dipyrromethene)propoxy]}-4-bora-3a,4a-diazaindacene (DPYBODPY). DPBODPY consists of a terminal fluorophore and a selective ligand and was designed to detect significant changes in absorbance and/or fluorescence on metal ion binding. The fluorophore is based on the Bodipy unit due to its excellent photophysical properties, while the dipyrrin unit has specific recognition abilities for Fe2+ and Zn2+ ions. The combination of these two structures is optimised to achieve significant spectral changes in the presence of Fe2+ and Zn2+ ions. (C) 2012 Elsevier Ltd. All rights reserved.Öğe Novel dipodal Schiff base compounds: Synthesis, characterization and spectroscopic studies(ELSEVIER, 2015) Obali, Aslihan Yilmaz; Ucan, Halil IsmetTwo novel dipodal Schiff base compounds 1,2-benzyloxy-bis-12-(benzylidenearnino)phenol, L1 and 1,2-benzyloxy-bis[3-(benzylideneamino)pyridine] 12 were synthesized. Their sensing actions were confirmed by UV-Vis absorbance and emission spectroscopic studies in presence of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Sn(II), Cd(II) and Pb(II) in methanol medium (1 x 10-4 M). It was found that the dipodal compounds can selectively bind to Cu(II) and Pb(II) metal ions with a significant change in its emission and absorption spectra, while the addition of other metal ions (Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Sn(II), Cd(II) and Pb(II)) produces insignificant or minor changes. The host-guest complexes formed were determined by Job's plot method. As a chemosensor, L1 and L2 dipodal Schiff base compounds shows a specific selectivity towards Cu(II) and Pb(II) ions in according to all spectroscopic data. (C) 2014 Elsevier B.V. All rights reserved.Öğe Preparation of Different Substitued Polypyridine Ligands, Ruthenium(II)-Bridged Complexes and Spectoscopic Studies(SPRINGER/PLENUM PUBLISHERS, 2016) Obali, Aslihan Yilmaz; Ucan, Halil IsmetNovel different substitued polypyridine ligands 4-((4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)phenoxy)methyl)benzaldehyde (BA-PPY), (E)-N-(4-((4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)phenoxy)methyl)benzylidene)-pyrene-4-amine (PR-PPY), (E)-N-(4-((4-(1H-imidazo[4,5-f][1,10] phenanthroline-2-yl)phenoxy)methyl)benzylidene)-1,10-phenanthroline-5amine (FN-PPY), 2-(4-(bromomethyl)phenyl)-1H-imidazo[4,5-f][1,10] phenanthroline (BR-PPY), 2-(4-(azidomethyl)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline (N3-PPY) and triazole containing polypyridine ligand 3,4-bis[(4-(metoxy)-1,2,3-triazole)1-methylphenyl)-1H-imidazo[4,5-f][1,10]phenanthroline)] benzaldehyde (BA-DIPPY) and Ruthenium(II) complexes were synthesized and characterized. Their photopysical properties were investigated. The complexes RuP(PR-PPY), RuB(PR-PPY, RuP(FN-PPY) and RuB(FN-PPY) exhibited a broad absorption bands at 485, 475, 476, and 453 nm, respectively, assignable to the spin-allowed MLCT (d(pi)-pi*) transition. The emission maxima of the pyrene-appended polypyridine ligand PR-PPY was observed at lambda ems = 616 nm and the phenanthroline-appended polypyridine ligand FN-PPY was observed at lambda ems = 668 nm. And the emission maxima of the complexes RuP(PR-PPY), RuB(PR-PPY), RuP(FN-PPY) and RuB(FN-PPY) were observed at lambda ems = 646, 646, 685 and 685 nm, respectively. As seen in fluorescence spectra, the fluorescence intensities of the ligands are higher than their metal complexes. This is because of quenching effect of Ruthenium(II) metal on chromophore groups.Öğe Ruthenium (II) Complexes of Mono-, Di- and Tripodal Polypyridine Ligands: Synthesis, Characterization, and Spectroscopic Studies(SPRINGER/PLENUM PUBLISHERS, 2015) Obali, Aslihan Yilmaz; Ucan, Halil IsmetMono-, di- and tripodal polypyridine ligands 4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)phenol (L1), 2-(4-(2-((4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)phenoxy)methyl)benzyloxy)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline (L2), 2-(4-(4-((4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)phenoxy)methyl)benzyl oxy)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline (L3), 2-(4-(4,6-bis(4-(1H-imidazo[4,5-f][1,10] phenanthroline-2-yl)phenoxy)-1,3,5-triazine-2-yloxy)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline (L4), and their Ru (II) complexes have been synthesized and characterized. All the ligands (L1-L4) gave the emissions at three shoulder at 278 nm, 315 nm, and 328 nm and the complexes (C1-C4) exhibit Ru (II) metal centered emission at 265 nm, 288 nm and 328 nm in acetonitrile solution at room temperature. Maximum d-pi* transition seen at 462 nm for all the complexes.Öğe The Synthesis and characterization of five-coordinate Schiff base complexes of gallium(Selçuk Üniversitesi, 2015) Karatas, Erhan; Bayram, Mamure; Ucan, Halil IsmetThis work is an exploration into the synthesis and characterization of five-coordination of gallium complexes of ligands. (E)-2-(2-hydroxybenzylideneamino)phenol (1), (E)-2-((phenylim,no)methyl)phenol (2), 2-2'-(1E,1E')-(1,4-phenylenebis(azan-1-yl-ylidene))bis(methan-1-yl-1-ylidene)diphenol (3), 8-hydroxyquinoline (4). Fully characterized examples include those of general formula LGL', where L:1, L'2,3 or 4. Ligands and complexes were characterized by means of elemental analysis, infrared spectroscopy,1H NMR, thermal analyses, and magnetic susceptibility measurements.Öğe The Synthesis and Characterization of s-Triazine-Cored and [Fe(III)Salen]-Capped Polymer Complexes(SPRINGER, 2011) Karatas, Erhan; Ucan, Halil Ismet2,4,6-Trichloro-1,3,5-triazine (cyanuric chloride, C(3)N(3)Cl(3), 1) was used as the starting material. 2-(4-Carboxyphenylamino)-4,6-dichloro-1,3,5-triazine (2) was obtained from the reaction of cyanuric chloride with 4-aminobenzoic acid in the presence of sodium bicarbonate in acetone. A mononuclear complex (4) was obtained by reacting 2 and [FeSalen](2)O (3). A series of polymeric compounds was obtained by reacting 4 with a series of diamines. The polymeric complexes were characterized by elemental analysis, AAS, FT-IR, (1)H NMR, TGA and magnetic susceptibility measurements. The complexes are low-spin, distorted octahedral Fe(III) species that are bridged by carboxylic acids. The [FeSalen]-containing compounds may have the electronic structure t (2g) (5) e (g) (0) . All the complexes have six coordination and are polymeric.Öğe The Synthesis and Characterization of s-Triazine-Cored Tripodal Structure and Its Salen/Salophen-Bridged Fe/Cr(III) Capped Complexes(WILEY, 2017) Karatas, Erhan; Ucan, Halil IsmetA novel Schiff base compound was synthesized, and its complexation properties with Fe(III) and Cr(III) were investigated. Tripodal ligand was synthesized by the reaction of s-triazine and 4-hydroxybenzaldehyde. Then a Schiff base involving 8-hydroxyquinoline was synthesized by the reaction of 5-aminomethyl-8hydroxyquinoline (QN) and 2,4,6-tris(p-formylphenoxy)-1,3,5-triazine (TRIPOD) in methanol/chloroform media. The obtained Schiff base (QN-TRIPOD) was then reacted with four trinuclear Fe(III) and Cr(III) complexes including tetradentate Schiff bases N, N'-bis(salicylidene) ethylenediamine (salenH(2))/bis (salicylidene)-o-phenylenediamine (SalophenH(2)). The synthesized ligand and complexes were characterized by means of elemental analysis carrying out H-1 NMR, FTIR spectroscopy, thermal analyses, and magnetic susceptibility measurements. Finally, metal ratios of the prepared complexes were determined by using atomic adsorption spectrometry.Öğe Synthesis of Crosslinked Chitosan with Epichlorohydrin Possessing Two Novel Polymeric Ligands and Its Use in Metal Removal(SPRINGER, 2011) Sahin, Mustafa; Kocak, Nuriye; Arslan, Gulsin; Ucan, Halil IsmetOne of the major applications of chitosan and its derivatives is based on its ability to bind strongly toxic metal ions. In this work, two novel polymeric ligands were synthesized to investigate the adsorption properties of Cu(II), Pb(II), Zn(II) and Ni(II) ions in an aqueous solution. To prevent the reaction between as the C-2 amine group of chitosan and ECH, the C-2 amine group was protected N-benzylidene chitosan (CTB). After the reaction with ECH to give N-benzaldehyde crosslinked chitosan (CCTB), the Schiff base was removed in a dilute ethanol hydrochloride solution to obtain CCTS which has free amine group. CCTS-ECH was synthesized by the reaction of CCTS and ECH. Then, CCTS-ECH was reacted with (2-hydroxyphenylimino)methylbenzene-1,4-diol (HBD) and N,N'-bis(2,5-dihydroxybenzylidene)-1,4-diaminobenzene (DHDB) to give ligands CCTS-ECH-HBD and CCTS-ECH-DHDB. The batch experiments showed that two novel polymeric ligands can be effectively used to remove Cu(II) from water.
