Sülin Taşcıoğlu

Marmara University, İstanbul, Istanbul, Turkey

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Publications (10)13.53 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: Four copper(II) coordination polymers, {[Cu(pz(COO)2)(H2O)]4·HBr}n (1), {[Cu(pz(COO)2)(NH3)2]·H2O}n (2), {[Cu3H2(pz(COO)2)4(H2O)3]·2H2O}n (3) and {[Cu2(pz(COO)2)2(NH3)2(H2O)3][Cu(pz(COO)2)(NH3)(H2O)2][Cu(pz(COO)2)(NH3)(H2O)]·2H2O}n (4) were synthesized using pyrazine-2,3-dicarboxylic acid, CuBr2, 2-(2-aminoethylamino)ethanol/triethanol amine/ammonia in a methanol:water (1:1) solution, and the mixed ligand complexes were characterized by spectroscopic methods, thermal and elemental analysis, and magnetic susceptibility. Complexes 2 and 4 were also characterized by means of single crystal X-ray crystallography. The characterizations show that the complexes have polynuclear molecular structures, except for complex 2, and all of the complex structures form polymeric chains. Complex 4 has a pseudo-merohedral twin structure.
    Polyhedron 08/2011; 30(13):2171–2180. · 1.81 Impact Factor
  • İ. Pekgözlü, S. Seyyidoğlu, S. Taşcıoğlu
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    ABSTRACT: Pb2+ doped BaAl2B2O7 materials were prepared by a solution combustion synthesis. The phase of the synthesized materials was determined using the powder X-ray diffraction. The photoluminescent properties of Pb2+ doped BaAl2B2O7 materials were investigated using spectrofluorometer at room temperature. The emission and excitation bands of BaAl2B2O7: Pb2+ were observed at 423 and 266 nm, respectively. The dependence of the emission intensity on the Pb2+ concentration for BaAl2B2O7: Pb2+ was investigated. The Stokes shifts of BaAl2B2O7: Pb2+ was calculated to be 13 953 cm−1.
    Journal of Luminescence 09/2008; 128(9):1541–1543. · 2.14 Impact Factor
  • Sülin Taşcıoğlu, İlhan Pekgözlü, Ayhan Mergen
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    ABSTRACT: Nanopowders of Pb2+ doped SrAl2B2O7 materials were synthesized by a solution-combustion method using metal nitrates and urea as fuel. The synthesized materials were determined by the powder X-ray diffraction. The microstructure of the synthesized materials was investigated using scanning electron microscopy. The photoluminescent properties of Pb2+ doped SrAl2B2O7 materials were studied using spectrofluorometer at room temperature. The emission and excitation peaks of SrAl2B2O7:Pb2+ were observed at 420 and 277nm, respectively. The Stokes shifts of SrAl2B2O7:Pb2+ were calculated to be 12,292cm−1. The dependence of the emission intensity on the Pb2+ concentration for SrAl2B2O7:Pb2+ was investigated.
    Materials Chemistry and Physics - MATER CHEM PHYS. 01/2008; 112(1):78-82.
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    Sülin Taşcıoğlu
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    ABSTRACT: Copper complexes obtained from the reactions between 2-thiouracil and cupric hydroxide in different solvents have been investigated. Mononuclear or polynuclear complexes of Cu(I) have been obtained depending on the reaction conditions. Hydroxo complexes of copper(I) have been obtained at pH around 3.5. 2-Thiouracil acts as mono-or bidentate ligand in complexes. [Cu(H 2 TU) 2 OH], [Cu 5 (H 2 TU) 6 (OH) 5 ] and [Cu 3 (H 2 TU) 4 -(HTU)(OH) 2 ] have been obtained from the aqueous ethanolic, aqueous and dioxan solutions, respectively. Oligomeric structures of polynuclear complexes are suggested to be via the bridging of copper atoms through electron donating atoms of bidentate thiouracil. The complex, [Cu 3 (H 2 TU) 4 (HTU)(OH) 2 ], reacts with concentrated HCl to give [Cu 3 (H 2 TU) 4 Cl 3 ], in which its trinuclear structure is preserved. The properties and structure of [Cu 3 (H 2 TU) 4 Cl 3 ] are different from those of [Cu(H 2 TU) 2 Cl], which is synthesized from cuprous chloride. Spectral, thermal, magnetic studies and elemental analyses for the complexes have been carried out. IPC Code: Int. Cl. 8 C07F1/08 2-Thiouracil [2,3-dihydro-2-thioxo-(1H)pyrimidin-4-one], [H 2 TU], is one of the components of transfer ribonucleic acid. H 2 TU and its substituted thiouracils have shown therapeutic effects, such as anti-tumour and anti-thyroid activities 1-3 . 2-Thiouracil exhibits several tautomeric forms which allow several coordination routes for metals and also provides hydrogen bonding sites to give highly stable compounds 4 .
    Indian Journal of Chemistry. 02/2007; 46:80-85.
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    ABSTRACT: N-(2-Hydroxybenzyl)aminopyridines (Li) react with Cu(II) and Pd(II) ions to form complexes in the compositions Cu(Li)2(CH3COO)2·nH2O (n=0, 2, 4), Pd(Li)2Cl2·nC2H5OH (n=0, 2) and Pd(L2)2Cl2·2H2O. In the complexes, the ligands are neutral and monodentate which coordinate through pyridinic nitrogen. Crystal data of the complexes obtained from 2-amino pyridine derivative have pointed such a coordinating route and comparison of the spectral data suggests the validity of similar complexation modes of other analog ligands. Cu(II) complex of N-(2-hydroxybenzyl)-2-aminopyridine (L1), [Cu(L1)2(CH3COO)2] has slightly distorted square planar cis-mononuclear structure which is built by two oxygen atoms of two monodentate carboxylic groups disposed in cis-position and two nitrogen atoms of two pyridine rings. The remaining two oxygen atoms of two carboxylic groups form two Cu and H bridges containing cycles which joint at same four coordinated copper(II) ion. IR and electronic spectral data and the magnetic moments as well as the thermogravimetric analyses also specify on mononuclear octahedric structure of complexes [Cu(L2)2(CH3COO)2·2H2O] and [Cu(L3)2(CH3COO)2·4H2O] where L2 and L3 are N-(2-hydroxybenzyl)-2- or 3-aminopyridines, respectively.X-ray analysis for [Pd(L1)2Cl2·2C2H5OH] show square planar environment around Pd(II) ion formed by two chlorine atoms in trans position and two nitrogen atoms of pyridine rings. The spectral data indicate structural similarity in the complexes obtained via ligand exchange between PdCl2(PhCN)2 and 3-amino and 4-aminopyridine derivatives.
    Polyhedron 01/2007; 26(13):3301-3309. · 1.81 Impact Factor
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    ABSTRACT: N-(2-hydroxynaphtalidene)β-alanine (I) forms two type complexes with Co(II) ions: binuclear complex [Co2(Napβala)2·2H2O]·H2O (III) and trinuclear mixed-valence complex {[Co(Napβala)2]2·Co(H2O)4}·4H2O·2C2H5OH (IV). X-ray data and magnetic measurements indicated that trinuclear complex had CoIII–CoII–CoIII distribution of oxidation states. Co(III) ions has weak distorted octahedric environment of four oxygen and two nitrogen atoms due to two ligand molecules per each. The tetrahydrate envelope of Co(II) ion is upgraded to octahedra with two oxygen atoms of two bridge carboxylic group of the ligand molecules which coordinates Co(III) ions. The azomethine bond in I is reduced to secondary amine group by sodium borohydride in dimethylformamide solution, which contains water. Cobalt (II) complex of the reduced Schiff base Co(RNaphβala)·2H2O (V) has been synthesized and its spectroscopic and magnetic properties are reported. Binuclear cobalt (II) complex of Schiff base is reduced by NaBH4 and complex V is obtained. Trinuclear mixed-valence complex IV could not be reduced under similar conditions.
    Polyhedron 01/2006; 25(6):1279-1286. · 1.81 Impact Factor
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    Adnan Aydın, Ozgen Ercan, Sülin Taşcıoğlu
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    ABSTRACT: A rapid, simple, selective and sensitive method for the spectrophotometric determination of nitrite in water has been developed and optimum reaction conditions along with other analytical parameters have been evaluated. Nitrite reacts with barbituric acid in acidic solution to give the nitroso derivative, violuric acid. At analytical wavelength of 310nm, Beer's law is obeyed over the concentration range 0.00-3.22ppm of nitrite. The molar absorptivity is 15330+/-259.7 (95%) with pooled standard deviation of 355.57 and R.S.D. of 2.32%. As well as the method is sensitive (2.99x10(-3)mug NO(2)cm(-2)) and selective, it tolerates most of the potential interferents. It has been successfully applied to nitrite determination in natural waters by use of a calibration graph with determination limit of 1.66mug NO(2) in 100mL working solution corresponding to minimum 9.5ppb NO(2)-N in water samples. Lower concentrations of nitrite (3.0mug NO(2)/L sample) is precisely analyzed by using the method of dilution with sample, with R.S.D. of lower than 0.5%. The results were compared with standard N-(1-naphtyl)ethylenediamine dihydrochloride method and very good agreement between the data was observed. The method can easily be applied in the field.
    Talanta 07/2005; 66(5):1181-6. · 3.50 Impact Factor
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    Sülin Taşcıoğlu, Esra Kakı, Senay Taşcıoğlu
    Journal of Applied Spectroscopy 79(5). · 0.69 Impact Factor
  • Sülin Taşcıoğlu, Esra Kakı, Senay Taşcıoğlu
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    ABSTRACT: A new reagent for spectrophotometric determination of Mo(VI) was developed utilizing micellar effects. For this purpose, differences in the ultraviolet and visible spectral properties of Mo(VI), gallic acid, L-serine, and their binary and ternary solutions were studied in the presence and absence of cationic, anionic, and non-ionic surface active agents. L-serine was observed to form binary complexes and a ternary complex with Mo(VI) and gallic acid below its isoelectric point. The maximum Mo(VI) sensitivity was exerted by the Mo(VI) + gallic acid + L-serine + hexadecyltrimethylammonium bromide system at pH of 4.5. This system was proposed for use in the spectrophotometric determination of Mo(VI) as a superior alternative to the Mo(VI) + gallic acid + hexadecyltrimethylammonium bromide system and to most of the instrumental analysis methods referred to in the literature. The mechanism of micellar effects was discussed on the basis of the spectral data obtained above and below the isoelectric point of L-serine and explained in terms of the molecular charge of the substrates and the surfactants.
    Chemical Papers- Slovak Academy of Sciences 66(1). · 0.88 Impact Factor
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    ABSTRACT: 2-(2-Aminoethylamino)ethanol (L) reacts with cupric bromide in dimethylformamide to give a mononuclear complex of Cu(II) [L2Cu]Br2, with six-coordinate distorted octahedral geometry, in which two molecules of tridentate (N,N,O) ligand are involved. The structure was confirmed by spectroscopic methods, elemental and thermogravimetric analyses, and magnetic measurements. Optimization of possible configurations indicated the formation of the trans structure of the complex. Experimental results indicate that the investigated complex, bis[2-(2-aminoethylamino)ethanol] copper(II) bromide, behaves as a semiconductor in the studied temperature range of 298–388 K. Gas sensing properties of the film for the volatile organic compounds (VOCs): acetone, tetra-chloromethane, chloroform, ethanol, and methanol, were also investigated as a function of vapor concentration and temperature in dark. The film showed maximum sensitivity to tetrachloromethane and ethanol vapors at room temperature. Responses of the film to the tested gases are reversible.
    Chemical Papers- Slovak Academy of Sciences 67(6). · 0.88 Impact Factor