Fizik Bölümü / Department of Physics
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Publication Metadata only Solid-state vibrational spectroscopy: Part 11. An infrared and raman vibrational spectroscopic study of metal(II) halide aniline complexes(Elsevier, 1983) Davies, J. Eric D.; AKYÜZ, SEVİM; 10127Infrared (4000−200 cm−1) and Raman (3500−50 cm−1) spectra are reported for metal(II) halide aniline complexes of the following stoichiometries: (MX2an2) (M Co, Ni or Hg, X Cl; M Mn, X Cl or Br; M Zn or Cd, X Cl, Br or I); (MX2an3) (M Mn, X Cl or Br; M Ni, X Cl); (CdCl2an) and an assignment is proposed for all the observed bands. Low-temperature (83 K) IR spectra are also reported and it is noted that whilst the aniline ring and CH mode values are virtually insensitive to temperature, the NH2 rocking and metal-ligand stretching mode values increase with decreasing temperature, whilst the NH2 stretching mode values decrease with decreasing temperature.Publication Metadata only Laser microprobe mass analysis (LAMMA) of pyridine adsorbed on some clay minerals from Turkey(Kluwer Academic Publishers, 1985-06) Waele, J. K.; Adams, F. C.; AKYÜZ, ZEKİ TANIL; AKYÜZ, SEVİM; 10127Using laser microproble mass analysis (LAMMA), it is possible to characterize the inorganic composition of clays and to study adsorption phenomena. Natural sepiolite, (Na-sepiolite), montmorillonite and saponite samples from Anatolia (Turkey) have been investigated. All the clays gave different fingerprint mass spectra which allowed a quick estimation of the relative amounts of exchangeable cations as well as the trace contaminants and the homogeneity of their distribution. The adsorption behaviour of these clays for pyridine was also studied and it appeared that pyridine molecules penetrated the inner layers, as well as being adsorbed on the external surface.Publication Metadata only An Infrared and Raman Spectroscopic Study of Metal II Di 2 Methylpyridine Tetracyanonickelate Complexes(Kluwer Academic Publishers, 1985-12) AKYÜZ, SEVİM; 10127The results of an infrared and Raman spectroscopic study are reported for two new metal 2-methylpyridine tetracyanonickelate complexes, M(C6H7N)2Ni(CN)4, M=Ni or Cd. Their structure consists of corrugated polymeric layers of {M-Ni(CN)4}∞ with 2-methylpyridine molecules bound directly to the metal (M). These complexes can act as host lattices in the formation of inclusion compounds with dioxane guest molecules.Publication Metadata only An Infrared and Raman Spectroscopic Study of Metal II Diquinoline Tetracyanickelate Complexes(1986) Yurdakul, Şenay; Davies, JED; AKYÜZ, SEVİM; 8372; 10127Publication Metadata only An Infrared and Raman Spectroscopic Investigation of Copper II Tetracyanonickelate Complexes ofalpha beta and gamma picoline(Kluwer Academic Publishers, 1986-09) AKYÜZ, SEVİM; 10127Copper(II) dipicoline tetracyanonickelate complexes, CuL2Ni(CN)4 (L=α,β- orγ-picoline), have been prepared for the first time and their infrared and Raman spectra are reported. Their structure consists of polymeric layers of {Cu-Ni(CN)4}∞ with picoline molecules bound directly to the copper. It is proposed that the Cu-NC bonds are in two nonequivalent pairs in trans positions. Low temperature (83K) IR spectra have also been recorded and it is noted that the Ni(CN)4 group frequencies increase with decreasing temperature while the picoline frequencies are insensitive to temperature.Publication Metadata only An Infrared Spectroscopic Studies of 4 4 Bipridyl Metal II Tetracyanonickelate Complexes and Their Clathrates(1987) Sungur, Arzu; Davies, JED; AKYÜZ, SEVİM; 10127Publication Metadata only Infrared Spectral Investigations of Adsorption and Oxidation of N,N-Dimethylaniline by Sepiolite, Loughlinite and Diatomite(Springer, Dordrecht, 1987) AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 10127The adsorption behaviour of sepiolite,loughlinite (Na-sepiolite) and diatomite for N,N-dimethylaniline (DMA) and its catalytically formed oxidation products are studied using IR spectroscopy. It is found that sepiolite and loughlinite adsorb DMA and then react with it more easily than diatomite. The adsorption capacity sequence of DMA for the minerals studied is sepioliteandgt;loughliniteandgt;diatomite.Publication Metadata only An infrared and raman spectroscopic study on some 3,5-lutidine metal(II) tetracyanonickelate complexes(Elsevier, 1987-01) Yurdakul, S.; Davies, J. Eric D.; AKYÜZ, SEVİM; 10127The results of an infrared and Raman spectroscopic study are presented for seven new metal(II) 3,5-lutidine tetracyanonickelate complexes, ML2Ni(CN)4 [where L = 3.5-di-methylpyridine or 3,5-lutidine; M = Mn, Fe, Co, Ni, Cu, Zn or Cd]. Their structure consists of polymeric layers of [MNi(CN)4]∞ with the 3,5-lutidine molecules bound directly to the metal (M). The copper complex has spectral features different from the other six compounds. The effective magnetic moments of the complexes are also given.Publication Metadata only An infrared and raman spectroscopic study of transition metal (II) halide quinoline complexes(Elsevier, 1988-05) Yurdakul, S.; Davies, J. Eric D.; AKYÜZ, SEVİM; 10127In this study infrared (4000-200 cm−1) and Raman (3500-50 cm−1) spectra are reported for the metal (II) halide quinoline complexes of the following stoichiometries: Mq2Cl2(MMn, Fe, Co, Ni, Cu, Zn or Hg; qquinoline) MqX2 (MCd or Hg; XCl, Br, I); Mq2I2(MCd or Zn) and Mq2Br2(MCo, Ni, Cu or Zn). The MqX2, Hgq2Cl2 and Cdq2I2 complexes have been prepared for the first time. The analysis of the vibrational spectra indicates that there are some structure-spectra correlations.Publication Metadata only Infrared and raman spectroscopic investigations of cadmium tetracyanonickelate complexes of aminopyridines(Elsevier, 1988-05) AKYÜZ, SEVİM; 10127The infrared and Raman spectra of three new complexes of the formula CdL2Ni(CN)4 {L = 2-aminopyridine or 2-amino-4-methylpyridine} and Cd(L) (NH3)-Ni(CN)4 {L = 2-amino-3-methylpyridine} are reported. It is concluded that the ring nitrogen and not the amino nitrogen is involved in complex formation. Vibrational assignments for all the bands observed are proposed. The complexes are shown to have a structure consisting of two dimensional polymeric layers formed with Ni(CN)4 ions bridged by CdL2 {L = 2-aminopy or 2-amino-4-methylpy} or Cd(NH3)(L) {L = 2-amino-3-methylpy} cations. Several modes of coordinated aminopyridines have upward wavenumber shifts in comparison to those of the free molecules. These are thought to be due to the coupling of the internal modes of aminopyridines with the MN vibrations.Publication Metadata only Vibrational spectroscopic studies of three dimensional host lattices formed by pyrazine bridges between tetracyanonickelate layers(Kluwer Academic Publishers, 1990-12) Davies, J. Eric D.; AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 10127Three dimensional host lattices have been developed by forming bridges with bidentate pyrazine molecules between adjacent tetracyanonickelate polymeric layers of Ni(II) or Cd(II). The Fourier-transform IR and Raman spectra (4000-200 cm−1) of the compounds with the general formula M(pyz)Ni(CN)4, (where M = Ni or Cd) are reported. These host lattices can include benzene molecules but it is found that aniline molecules cannot be included in these structures. They, however, form complexes with the formula M(an)2Ni(CN)4, by replacing pyrazine ligands. A monodentate pyrazine complex of Cd(II) with the formula Cd(pyz)2Ni(CN)4 has also been prepared.Publication Metadata only An Infrared and Raman Spectroscopic Study of Pyrazine Cadmium II Tetracyanometalate II Benzene 1 1 Clathrates(Kluwer Academic Publishers, 1991-01) Ekici, Nurcan; Kantarci, Ziya; AKYÜZ, SEVİM; 10127Two new benzene clathrates of the form Cd(Pyrazine)M(CN)4⁗C6H6, where M = Cd or Hg, have been prepared and their infrared and Raman spectra are reported.Publication Metadata only The FT IR and Raman Spectroscopic studies of Some Liquid Crystals(Taylor and Francis Online, 1993) Acimiş, Mahmut; Alaman, Ayşen; AKYÜZ, SEVİM; 10127Room temperature FT-IR and Raman spectra of some lyotropic liquid crystals in anionic and cationic mesophases composed of sodium dodecylsulphate/ orthophosphoric acid monodecyl ester/H2O and decylammonium chloride/ orthophosphoric acid monodecylester/H2O have been studied together with polarizing microscopy. All the vibrational bands observed are assigned. Intramolecular order is found to decrease upon dilution. Hydrogen bonding type interaction between the head groups of sodium dodecylsulphate or decylammonium chloride and orthophosphoric acid monodecylester is detected.Publication Metadata only The FT IR Spectroscopic Study of Adsorption of Benzidine by Sepiolite from Eskisehir Turkey(1993) Davies, JED; AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 10127Publication Metadata only Temperature-dependent Fourier transform infrared spectra of phospholipid bilayers: melittin- and cholesterol-induced effects on molecular organization(Elsevier, 1993-01-14) Davies, J. Eric D.; AKYÜZ, SEVİM; 10127The perturbations induced by melittin and cholesterol on the molecular organization of dimyristoyl-l-α-phosphatidylcholine (DMPC) bilayers, depending on the temperature and concentrations of both melittin and cholesterol, were studied using FT-IR spectrometry. Analysis of the amide I and amide II bands of melittin indicates that melittin exists as a monomer at all temperatures in the DMPC-melittin system (lipid:protein molar ratio R = 14:1) and in DMPC-cholesterol-melittin dispersions (R = 14 and 25) for low cholesterol concentrations (10 mol%). However in the DMPC-cholesterol-melittin systems with high cholesterol (20 mol%) and high melittin (R = 14) concentrations, melittin is found to be in a tetrameric form at T > Tm. The melittin-induced effects in DMPC bilayers containing a low melittin concentration (R = 25) are found to decrease on addition of cholesterol (10 or 20 mol%). Cholesterol, however, has the opposite effect in DMPC-cholesterol-melittin systems containing high cholesterol (20 mol%) and high melittin concentrations (R = 14), i.e., and increased lipid-protein interaction. Cholesterol- and melittin-induced effects on the spectral features of the phospholipid are discussed.Publication Metadata only A Vibrational Spectroscopic Study of the Adsorption of 4 4 Bipyridiyl by Smectite Group Clay Minerals From Anatolia Turkey(Kluwer Academic Publishers, 1993-06) Davies, J. Eric D.; AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 1012The adsorption of 4,4′-bipyridyl by natural sepiolite and smectite group clay minerals (bentonite, hectorite and saponite) from Anatolia (Turkey) has been studied using vibrational spectroscopy. Investigation of Fourier-transform infrared and Fourier-transform Raman spectra of adsorbed 4,4′-bipyridyl indicate the presence of chemisorbed species. However, any evidence for the generation of anionic species on the surface of the phyllosilicates has not been detected. It is proposed that the adsorbed bipyridyl molecules on sepiolite are centrosymmetric and H-bonded to the surface hydroxyls through both the nitrogen lone pairs as bidentate ligands. The adsorbed bipyridyl molecules on the smectite group clays are coordinated to exchangeable cations both directly and also indirectly through water as monodentate ligands. XRD patterns of the clays studied are also recorded.Publication Metadata only A Vibrational Spectroscopic Study of Hofmann Type Complexes of 3 and 4 Methyl Pyridines(Elsevier, 1994-02-10) Paşaoğlu, Hümeyra; AKYÜZ, SEVİM; 10127; 117764The FT-IR and Raman spectra of eight new Hofmann-type complexes of 3- and 4-methylpyridine, ML2Ni(CN)4 (M = Mn, Fe, Co or Zn; L = 3- or 4-methylpyridine) are reported. The structure consists of corrugated polymeric layers of [MNi(CN)4]∞ with methylpyridine molecules bound directly to the metal (M). For a given ligand (3-Mepy or 4-Mepy) the effects of metalligand bond formation on the ligand modes are examined and the metal sensitivity sequence of the ligand frequencies is found to be Mn < Fe < Co < Zn. The metalligand bond strengths of the methyl derivatives of pyridine in which the substituents are in different positions have also been compared and are found to increase in the order 3-Mepy < 4-Mepy for a given transition metal. The effective magnetic moments of the complexes are given.Publication Metadata only Adsorption of 2 2 Bipyridyl onto Sepiolite Attapulgite and Smectite Group Clay Minerals from Anatolia FT IR and FT Raman Spectra of Surface and Intercalated Species(Kluwer Academic Publishers, 1994-06) Davies, J. Eric D.; AKYÜZ, SEVİM; AKYÜZ, ZEKİ TANIL; 10127The adsorption of 2,2′-bipyridyl by natural sepiolite, attapulgite, hectorite, saponite and natural and ion exchanged (Mn, Fe, Co, Ni, Cu, Zn or Sn) bentonites has been investigated by FT-IR and FT-Raman spectroscopy. Spectroscopic results indicate that most of the adsorbed molecules are coordinated to either exchangeable cations (in the case of smectite group clays) or Lewis acidic centres (in the case of sepiolite and attapulgite) as bidentate ligands. The formation of monoanionic surface species has also been detected, to a relatively small extent. No physisorbed surface species has been observed. XRD patterns and UV-visible spectra of the samples are also recorded for additional information.Publication Metadata only An Infrared and Raman Spectroscopic Study of Td type 4 4 bipyridylcadmium II Tetracyanometallate Benzene 1 2 Clathrates(Kluwer Academic Publishers, 1994-09) Bayarı, Sevgi; Kantarci, Ziya; AKYÜZ, SEVİM; 4103; 10127Two new benzene clathrates of the form Cd(4,4′-bipyridyl)M(CN)4 · 2C6H6, (M=Cd or Hg) have been prepared in powder form. Their spectral data were compared with those of the corresponding host complexes and found to be consistent with the host structure found in Td-type clathrates.Publication Metadata only Fluorescence Spectra of Salt Solutions of Coumarin Crown Ethers(Taylor and Francis Online, 1995) Bulut, Mustafa; Göçmen, Ayten; Erk, Clakil; AKYÜZ, SEVİM; 10127; 205874The fluorescence spectra of the coumarin derivatives of crown ethers obtained from 7,8-dihydroxycoumarins were studied in the presence of some alkali and alkaline earth cations in acetonitrile. The altered fluorescence spectra were examined qualitatively from the point of enhancement of fluorescent quantum yields as well as a resonance. Heavy metal effects were eliminated since there is no influence of the metal salts on the spectra of the initial coumarin derivatives. However, both the complexation-enhanced fluorescence and complexation-enhanced quenching spectra is observed in the fluorescence emission and excitation spectra of macrocyclic ether-coumarin / metal salt systems. The origin of results are briefly discussed in terms of crown ether complexation. In water solutions almost no such effects were observed.