Browsing by Author "Gul, Ahmet"

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Citation Count: 6
Synthesis and boron interaction of new amino acid containing phthalocyanines and the precursor
(Elsevier Science Sa, 2018) Cenikli Başeren, Şükran; Erdogmus, Ali; Gul, Ahmet; Patoloji Laboratuvar Teknikleri / Pathology Laboratory Techniques
A new phthalonitrile precursor with tyrosine substituent and the zinc phthalocyanine derived from it were synthesized and their interaction with diphenylborinic acid was studied. The new compounds were characterized by using elemental analysis, IR, H-1 and B-11-NMR and UV-VIS spectral data. B-11-NMR data demonstrated that boron atom attached to the phthalonitrile precursor is in a bulky tetra-coordinated state with the formation of a coordinative N-B bond while completely planar phthalocyanine moieties with high aggregation tendencies at the concentrations used in NMR measurements lead the borinic ester side of the molecule into a planar tri-coordinated form. Moreover, the consequences of the presence of diphenylborinic ester groups on the spectral, photophysical and photochemical properties of the new zinc phthalocyanine are investigated in detail. (C) 2018 Elsevier B.V. All rights reserved.
Citation Count: 0
Synthesis and electrical properties of 2,9(10),16(17),23(24){4-[bis[2-(hydroxy)ethyl]amino}benzyloxy-phthalocyaninatozinc(II)
(Elsevier, 2021) Cenikli Başeren, Şükran; Kuru, Tugba Sasmaz; Gul, Ahmet; Patoloji Laboratuvar Teknikleri / Pathology Laboratory Techniques
A novel zinc phthalocyanine with four 4-bis(hydroxyethylamino)benzyloxy groups was synthesized and characterized by using IR, H-1 and C-13 NMR and UV-VIS spectral data. Also, some physical analyses were carried out on this new zinc phthalocyanine. Conductivity, dielectric and impedance properties of the sample were investigated in the temperature range of 300-525 K and the frequency range of 100-10 MHz. It has been found that DC conductivity can be explained by Arrhenius type conductivity and the transition is from extrinsic conduction to intrinsic conduction. AC conductivity exhibits an almost linear behavior with frequency explained by the quantum mechanical tunneling (QMT) model. The dielectric constant decreased with increasing frequency, but instead increased with increasing temperature. This is an indication that dielectric dipoles are thermally active. From the results obtained by impedance spectroscopy, it was found that the relaxation process is a Cole-Cole model. (C) 2021 Elsevier B.V. All rights reserved.