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ABDURRAHMANOĞLU, ŞAZİYE

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ABDURRAHMANOĞLU

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ŞAZİYE

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    The nonlinear refraction and nonlinear absorption in 4-(4,6-diaminopyrimidin-2-ylthio) substituted double-decker Lu(III) phthalocyanine
    (PERGAMON-ELSEVIER SCIENCE LTD, 2008) ABDURRAHMANOĞLU, ŞAZİYE; Yaglioglu, H. Guel; Arslan, Metin; Abdurrahmanoglu, Saziye; Unver, Huseyin; Elmali, Ayhan; Bekaroglu, Ozer
    A 4-(4,6-diaminopyrimidin-2-ylthio) substituted double-decker Lu(III) phthalocyanines (4) have been prepared and characterized by elemental analysis, IR, LIV-vis and H-1 NMR spectroscopies. The nonlinear refractive index, nonlinear absorption and the optical limiting (OL) performance of the compound 4 in a 0.5 mm spectroscopic cell in DMF solution were investigated by using 4 ns pulse laser at 532 nm. Z-scan experiments have been conducted between 0.24 and 2.39 GW/cm(2) peak intensities for 10 Hz repetition rate and also between 2.39 and 23.89 GW/cm2 peak intensities for 1 Hz repetition rate. The thermal effect contributes to the nonlinear response of the material higher than 0.72 GW/cm(2) peak intensity at 10 Hz. We measured the effective nonlinear refractive index of the material as 1.2 x 10(-11) esu at 3.5 x 10(-4) M concentration with the peak intensity less than 0.72 GW/cm(2) and we found that nonlinear absorption was very small. On the other hand, when concentration is increased to 2.4 x 10(-3) M material's nonlinear absorption becomes dominant mechanism for the nonlinear response and the compound 4 indicates OL behavior at 2.4 x 10(-3) M concentration. (C) 2007 Elsevier Ltd. All rights reserved.
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    Synthesis and Characterization of Novel Zn(II) Dimeric Phthalocyanines
    (SPRINGER, 2009) ABDURRAHMANOĞLU, ŞAZİYE; Abdurrahmanoglu, Saziye; Bulut, Mustafa; Bekaroglu, Oezer; Sener, B
    Starting with tetracyanodibenzo(1,4,7,10-tetrathia-(12-crown-4)) (1) and 4-nitro-1,2-dicyanobenzene (2), nitro-substituted dimeric phthalocyanine (3) was synthesized. In the second step, using hydrazine hydrate as a reductant, amine-substituted dimeric phthalocyanine (4) was synthesized from nitro-substituted dimeric phthalocyanine. Structrures of all synthesized compounds were determined by elemental analyses, UV/vis, H-1-NMR and IR spectroscopy.
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    Synthesis and electrical properties of novel supramolecular octa-phthalocyaninato-dicobalt(II)-hexazinc(II) and dicobalt(II)dimeric-phthalocyanine with six ferrocenylimin pendant groups
    (PERGAMON-ELSEVIER SCIENCE LTD, 2006) ABDURRAHMANOĞLU, ŞAZİYE; Abdurrahmanoglu, Saziye; Altindal, Ahmet; Bulut, Mustafa; Bekaroglu, Ozer
    In this study supramolecular octakis phthalocyaninato-diCo(II)hexakis-Zn(II) has been synthesized in two steps. Starting with tetracyanodibenzo(1,4,7,10-tetrathia7(12-crown)) (1) and 4-nitro-1,2-dicyanobenzenc (2), nitro-substitutcd dimeric phthalocyanine (3) was synthesized. Compound 3 reacted with unsymmetric Zn(II) phthalocyanine (4) to furnish a supramolecular assemble of a Co(II) dimer with six Zn(II) phthalocyanines through azo bridges (5). Co(II) dimeric phthalocyanine with six ferrocenyl groups (7) was obtained by the condensation of 6 with ferrocenylaldehyde. Compounds 3, 5, 6 and 7 were characterized by elemental analysis, ICP-MS, IR, UV Vis and H-1 NMR spectroscopy. The electronic properties of a thin film of the compounds were investigated by impedance spectroscopy and d.c. conductivity measurements as a function of temperature. The a.c. conductivity is found to vary with frequency, omega, as omega(s) with index s <= 1, suggesting a hopping concluction mechanism for 3 and 6. Whereas a frequency independent conductivity was observed for 5. It was found that reducing the nitro group to amines and azo coupling by the asymmetric nitro groups increases the electrical conductivity. The higher conductivity of 5 can be attributed to the increase in the mobility of charge carriers due to overlap of the Tu electron systems along the stacking direction of the molecules. (c) 2006 Elsevier Ltd. All rights reserved.