Ersin Güler

Functionalization of polystyrene and adhesion studies

The adhesion capability of novel functional polystyrenes to metals and their capability to provide corrosion resistance to metals under various conditions have been investigated. The polyfunctional polystyrenes were prepared via reaction of the polystyrene with different functional groups [2-methyl-2,3-epoxy-6-octene-4-one (I), 2-methyl-2,3-epoxy-5,7-nonadien-4-one (II), 1-chloro-2,3-epoxy-5-chloromethyl-5-hexene (III), I-(Δ3-tetrahydrobenzaldoxime)-2,3-epoxy propane (IV), and maleic anhydride (V)] in the presence of catalysts. The results show that the addition of functional groups to the polystyrene increases its adhesion capability and corrosion resistance. This increase is attributed to the quantity and nature of the functional groups bonded to polystyrene.

Bodipy/dipyridylamino-based “turn-on” fluorescent chemosensor for trivalent chromium cations: characterization and photophysical properties

{{3,5-Bis[4,4-difluoro,8-(2,6-diethyl,1,3,5,7-tetramethyl-4-bora-3a,4a-diaza-s-indacene)]}}phenyl-N,N-di(pyridin-2-yl)benzamide (Bodipy-DPy) was designed as an efficient fluorescent chemosensor for Cr(III). The structure of Bodipy-DPy was confirmed by UV-vis spectroscopy, fluorometry, melting point analysis, 1H-NMR, 13C-NMR, elemental analysis and ESI-TOF-MS. Its photophysical properties was investigated by absorption, emission and excitation techniques. Based on chelation assisted fluorescence enhancement, a fluorometric method was developed for trace level detection, selectivity and concentration studies of chromium(III) in EtOH–H2O. The fluorescent ligand behaved as a chemosensor for Cr(III) cations and showed a strong red fluorescence upon coordination with Cr(III), whereas almost no fluorescence was observed for the other metal cations studied. The Bodipy-DPy has absorption and emission maxima at 528 nm and 535 nm, respectively. The equilibrium binding constant of Bodipy-DPy with Cr(III) was calculated as 1.17 × 106 from the Stern–Volmer equation.

Complexation properties and synthesis of a novel Schiff base with triphenylene nucleus

We presented the synthesis of a novel Schiff base and its complexation properties with some transition metal ions in this work. For this, the 2,3,4,6,7,10,11 hexahydroxytriphenylene (HHTP) as starting material was synthesized according to known procedure. Moreover, the 2-((2-chloroethylimino)methyl) phenol material was prepared with reaction of salicylaldehyde and 2-chloroethylamine hydrochloride. To give the 2,3,4,6,7,10,11-hexakis(salicyliminoethoxy)triphenylene (HSE-TP) as a novel Schiff base, the HHTP were treated with 2-((2-chloroethylimino)methyl)phenol in acetone media. Complexation properties of this Schiff base were investigated towards Ni(II), Cu(II), Co(II), Zn(II), Pd(II) and Cd(II) as transition metals. The structures of these new compounds (ligand and complexes) were characterized with FT-IR, magnetic susceptibility measurement, thermal methods (TGA), (1)H NMR and elemental analyses.

Synthesis and Complex Formation of Substituted Aminoglyoximes of Unsymmetrical VIC-Dioximes

Abstract Three new substituted aminoglyoximes, p-chloroanilinoglyoxime (p-CAGH2), o-chloroanilinoglyoxime (o-CAGH2), m-chloroanilinoglyoxime (m-CAGH2) have been synthesized from anti-chloroglyoxime (m-CAGH2) and the corresponding substituted amines. The Ni(II) and Cu(II) complexes of these ligands are square-planer while the Co(II) complexes are octahedral with water molecules as axial ligands. 1H-NMR, mass, IR spectra and elemental analyses data of the new compounds are given.

The example of calix[4]pyrrole derivative containing Bodipy unit: fluorometric and colorimetric sensor for F- ion.

A novel chemosensor based on calix[4]pyrrole derivative modified by Bodipy unit has been synthesized, and its complexes with various anions were investigated. The results show that the receptors can selectively recognize biologically important fluoride ions. The binding affinity for fluoride ions was investigated by naked-eye color change, absorption, emission, proton nuclear magnetic resonance spectroscopy. The addition of fluoride ions to an acetonitrile solution of chemosensor can result in an obvious color change (brownish yellow color to straw yellow). The stoichiometries between the receptor and fluoride were determined from the molar ratio plots using the UV-visible spectra, which showed evident 1:1. The proton nuclear magnetic resonance spectral data supported the fluoride anion recognition with the disappearance of the amino proton peaks.

Synthesis of macrocyclic polyethers and polyether diesters and preparation of their cationic complexes

New macrocyclic polyethers, 2,3,5,6-bis-[5′(5′)-chlorobenzo]-1,7,10-trioxacyclododeca-2,5-diene (I), 2,3,5,6-bis-[5′(5′)-chlorobenzo]-1,7,10,13-tetra oxacyclo pentadeca-2,5-diene (II), and 2,3,5,6-bis-[5′(5′)-chlorobenzo]-1,7,10,13,16-penta oxa cyclo octadeca-2,5-dien (III), and macrocylic lactones 2,3,5,6-bis-[5′(5′)-chlorobenzo]-1,7,10,13-tetraoxacyclopentadeca-2,5-diene-8,15-dione (IV) and 2,3,5,6-bis[5′(5′)-chlorobenzo]-1,7,10,13,16-pentaoxacyclooctadeca-2,5-diene-8,18-dione (V) were synthesized. Complexes of ligands III and V with metal cations were prepared. Furthermore, their metal-picrate extraction with some metal salts was attempted. Structures of the ligands and complexes were confirmed using spectroscopic techniques.

The Investigation of the Alkylation Reactions of Hydroxy and En‐Oximes with Some Halohydrins and Epoxides

Abstract Suitable glycol ethers (3a–d, 4a–d) and halohydrine compounds (11a–c) were synthesized in good yield by the alkylation reactions of the oximes, having hydroxy and double bond in its structure, with mono‐ and dihalogenhydrines in the medium of basic and solid–liquid phase transfer catalyst. A series of aminoalcohols were synthesized from these compounds obtained (16a, 17b, 18b).

SYnthesls and Characterization of Copper(II) and Nickey(II) Complexes of tee Schiff Bases Dertved from Δ3-Tetrahydro-Benzaldeeiyde and 2-Methyl-Δ3-Tetraendrobenzaldeende and Glycine

Abstract Copper(II) and nickel(II) complexes with the Schiff bases derived from Δ3-tetrahydrobenzaldehyde or 2-methyl-Δ3-tetrahydrobenzaldehyde and glycine were synthesized. These compounds have been characterized by elemental analyses, conductivity measurements and infrared spectroscopy. The Schiff base ligands and their complexes have been further characterized by 1H NMR The results suggest that the Schiff base acts as a bidentate ligand which bonds to the metal ions through the iminonitrogen and carboxylate oxygen. The potassium salts of the Schiff bases are 1:1 electrolytes, but all the complexes are non-electrolytes.

Novel magnetite nanoparticle based on BODIPY as fluorescent hybrid material for Ag(I) detection in aqueous medium.

This manuscript describes a highly selective and ultra-sensitive detection of Ag(I) in aqueous solution using amine coated magnetite nanoparticles modified boron-dipyrromethene by spectrofluorometer. Fe3O4 nanoparticles were synthesized by co-precipitation of Fe(2+)and Fe(3+)in an ammonia solution. Amine modified Fe3O4 was prepared by using (3-aminopropyl)triethoxysilane as silanization agent. The covalent binding of boron-dipyrromethene to amine modified Fe3O4 was confirmed by means of Fourier Transform infrared spectroscopy, transmission electron microscopy, dynamic light scattering, UV-vis and fluorimeter measurements and obtained nanoparticle-boron dipyrromethene structure. The binding abilities of nanoparticle-boron dipyrromethene towards different metal ions have been investigated by some spectroscopic methods as UV-vis, fluorescence spectroscopy, Job plot, etc. and the novel surface displayed high selectivity and sensitivity for Ag(I) among all tested metals.

SYNTHESIS OF THREE NEW VIC-DIOXIMES AND THEIR NICKEL(II) AND COPPER(II) COMPLEXES

In this study, anti-1-acetyl-1-cyclohexenylchloroglyoxime ( C 8 H 11 ClN 2 O 2 ) has been synthesized by chlorination of anti-1-acetyl-1-cyclohexeneglyoxime. As a result of the reaction of C 8 H 11 ClN 2 O 2 with aryl- or arylalkylamines in ethanol between -10 oC and -15 oC , unsymmetrical vic-dioximes were obtained and the obtained products were named as: anilino-1-acetyl-1-cyclohexeneglyoxime (C 14 H 17 N 3 O 2 ), benzylamino -1-acetyl-1-cyclohexeneglyoxime ( C 15 H 19 N 3 O 2 ), p-toluidino -1-acetyl-1-cyclohexeneglyoxime (C 15 H 19 N 3 O 2 ) respectively. Their transition metal complexes have been synthesized. The form of the obtained Ni(II) and Cu(II) complexes were found as square-planer as it is known usually. 1H n.m.r., conductivity measurements, magnetic properties, i.r spectra and elemental analyses data of ligands and complexes are given. In addition to this, thermal characterizations of the ligands and their complexes have been investigated.