Browsing by Author "Soenmez, Mehmet"

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Ohmic and Rectifier Properties of Al/Ligand(n-apth) and Al/Cu(ii)complex Contacts
(Elsevier, 2010) Temirci, Cabir; Guelcan, Mehmet; Goksen, Kadir; Soenmez, Mehmet
We have produced a Ligand(N-APTH) and Cu(II)Complex of bidentate ligand containing a ring of the pyrimidine. Optical transmission measurements of the Ligand(N-APTH) and Cu(II)Complex thin films were performed by using a UV-Visible (UV-VIS) spectrophotometer. From the optical measurements, it was seen that the materials show semiconductor behaviors giving appropriate bandgaps with the values of 3.15 eV and 2.36 eV for Ligand(N-APTH) and Cu(II)Complex, respectively. With the pre-assumption that the material may exhibit a rectifier or ohmic behavior when it is brought into an appropriate contact with a metal, an attempt to explore the rectifying and ohmic properties of Al/Ligand(N-APTH)/Cu and All Cu(II)Complex/Cu contacts was made. As a result of current-voltage (I-V) measurements, it was discovered that the devices show excellent rectifier properties with a rectification ratio of about 10(-3) for All Ligand(N-APTH)/Cu and 10(-5) for Al/Cu(II)Complex/Cu rectifier contacts, respectively. (C) 2010 Elsevier B.V. All rights reserved.
Studies on Reactions of Pyrimidine Compounds
(Taylor & Francis Ltd, 2007) Aslanoglu, Furgan; Akbas, Esvet; Soenmez, Mehmet; Anil, Baris
The 5-benzoyl-4,6-diphenyl-1,2,3,4-tetrahydro-2-thioxopyrimidin (1) have been prepared via Biginelli cyclocondensation reaction in acetic acid under reflux condition in good yield (93%). Reactions of 1 and iodomethane to afford thiopyrimidine compounds 3 and 5. Also, the acetylation of compounds 1 and 3 gave 3-acetyl thioxopyrimidine 2 and methylthiopyrimidine 4, respectively. Thioxopyrimidine derivative 6 was synthesized from 1 and POCl3/DMF Furthermore, the starting compound 1 were cyclized with various bromo compounds to the thiazolopyrimidine 7, 8, 9 and pyrimido[2,3-b]thiazine10 derivatives, in approximately 55-78% yields. The purpose of synthesizing the thioxopyrimidine derivatives is because of the high biological activities. All of these derivatives have been characterized by analytical and spectroscopic studies and the reaction mechanism is discussed.
Synthesis and Characterization of Heterocyclic Schiff Base and Its Complexes With Cu(Ii), Ni(Ii), Co(Ii), Zn(Ii), and Cd(Ii)
(Taylor & Francis Ltd, 2009) Soenmez, Mehmet; Bayram, M. Refik; Celebi, Metin
A new Schiff base, {1-[(2-hydroxy-naphthalen-1-ylmethylene)-amino]-4-phenyl-2-thioxo-1, 2-dihydro-pyrimidin-5-yl}-phenyl-methanone, has been synthesized from N-amino pyrimidine-2-thione and 2-hydroxynaphthaldehyde. Metal complexes of the Schiff base were prepared from acetate/chloride salts of Cu(II), Co(II), Ni(II), Zn(II), and Cd(II) in methanol. The chemical structures of the Schiff-base ligand and its metal complexes were confirmed by elemental analyses, IR, 13C-NMR, 1H-NMR, API-ES, UV-Visible spectroscopy, magnetic susceptibility, and thermogravimetric analyses. The electronic spectral data and magnetic moment measurements suggest mononuclear octahedral and mononuclear or binuclear square planar structures for the metal complexes. In light of these results, it was suggested that this ligand coordinates to each metal atom by hydroxyl oxygen, azomethine nitrogen, and thione sulfur to form octahedral complexes with Cd(II) and Zn(II).
The Template Synthesis, Spectral Characterizatin and Thermal Behaviour of New Binuclear Schiff Base Complexes Derived From N-Aminopyrimidine With 2,3-Butandione
(Walter de Gruyter Gmbh, 2006) Soenmez, Mehmet; Sekerci, Memet
A new series of two types of acyclic binuclear Schiff base complexes, prepared by template condensation of N-aminopyrimidine and 2,3-butandione in the presence of Cu-II, Ni-II, Co-II and Zn-II in n-BuOH solution, have been characterized by IR, elemental analyses, electronic spectral data, conductivity and magnetic measurements. From conductivity measurements, it is shown that the complex of Ni-II is electrolyte. All the complexes have sub-normal magnetic moments commensurate with their binuclear nature. The thermal behaviour of the complexes has been studied by t.g. technique.