İbrahim Erden

Highly soluble 3,4-(dimethoxyphenylthio) substituted phthalocyanines: Synthesis, photophysical and photochemical studies

The synthesis of a new 3,4-(dimethoxyphenylthio) substituted phthalonitrile (1) and its soluble metal free (2), zinc (II) (3), oxo-titanium (IV) (4) and nickel (II) (5) phthalocyanine derivatives are reported for the first time. The new compounds have been characterized by elemental analysis, FT-IR, (1)H NMR, UV-Vis, fluorescence spectroscopies and mass spectra. General trends are described for fluorescence, photodegradation and singlet oxygen quantum yields and fluorescence lifetimes of oxo-titanium (IV) and zinc (II) phthalocyanine compounds in dimethylsulfoxide (DMSO). The effects of the metal ion on the photophysical and photochemical parameters for these phthalocyanines (3 and 4) are also reported.

In Situ Synthesis of B4C / TiB2 Composites from Low Cost Sugar Based Precursor

In the present study, a method based on sulfuric acid dehydration of sugar was developed to synthesis a precursor material, which can yield B4C/ TiB2 composites at much lower temperatures compared to traditional carbothermal methods. The precursor material for pure B4C and B4C / TiB2 composites were heat treated at 1650oC under Ar and Ar+H2 atmosphere. Then the samples were characterized by X-ray diffraction (XRD) and crystallized B4C and B4C / TiB2 composites can be obtained at 1650oC

Synthesis and characterization of organic dyes containing 4,5-diazafluorene as efficient sensitizers for dye-sensitized solar cells

Abstract Two dyes which are 4,5-diazafluoren-9-one-derived diimine ligands and their corresponding Ru(II) bipyridine complexes were synthesized. The structures of all compounds were determined by FTIR, UV–Vis, 1H-NMR, 1C-NMR, and MS spectroscopic data. The photovoltaic and electrochemical properties of these compounds were investigated and the applicability in DSSCs as photosensitizers was studied. The photovoltaic cell efficiencies (PCE) of the devices were 0.36–1.26% under simulated AM 1.5 solar irradiation of 100 mW/cm2, and the highest open-circuit voltage (Voc) reached 0.34 V. When comparing the photovoltaic performance of DSSC devices, efficiency increases L2 < L2-Ru < L1 < L1-Ru. The PCE value of 1.26% was obtained with a DSSC based on L1-Ru under AM irradiation (100 mW/cm2). DSSC based on L1-Ru produced efficiency of 1.26%, whereas DSSC-based L1 exhibited the device performance with efficiency of 0.84% under illumination. These results show that the availability of a π-conjugated bridge and a richer electron donor for photovoltaic performance of the DSSC provides increased efficiency.

Synthesis, characterization and electrochemical properties of new phthalocyanines

Abstract The chemical synthesis and characterization with spectroscopic and electrochemical properties of [bis(4-fluorophenyl)-methoxy]-substituted metallo-phthalocyanines were reported for the first time. The new phthalocyanines have been characterized by elemental analysis, UV-Vis, FT-IR, and mass spectroscopies. The aggregation behavior of the phthalocyanine compounds was investigated in different solvents and concentrations. It is found that the fluoro substituents of peripherally Co and Cu complexes are examined and induce a shift to the redox processes toward the negative potentials and formed more reversible processes. Metal-based reduction and oxidation reactions were obtained for the Co(II) complex, whereas Cu(II) complexes exhibited Pc-ring-based electron-transfer reactions. The voltammetric measurements supported the proposed structure of the complexes.

Synthesis and Characterization of New D-π-A Type Fluorene Ligands and Their Ru(II) Complexes

4,5-Diazafluorene ligands, (L1) and (L2), have been synthesized from the reaction of 4,5-diazafluorenone-9-hydrazone with 4-(4-fluorophenoxy) benzaldehyde and 4,5-diazafluoren-9-one with 4-(4-fluorophenoxy) benzylamine hydrochloride in dry EtOH. Ru(II) complexes of the ligands Ru(II)-L1 and Ru(II)-L2 were prepared by treating the ligands with Ru(bpy)2CI2 in dry EtOH. The metal-to-ligand ratio of the Ru(II) complexes was found to be 1:1. The ligands and complexes were characterized by elemental analysis and spectra FTIR, UV-vis, 1H NMR, MS, and fluorescence studies.

SYNTHESIS AND CHARACTERIZATION OF 5,6-DIAMINO-1,10-PHENANTHROLINE SUBSTITUTED ANTI-DICHLOROGLYOXIME AND ITS COMPLEXES WITH COBALT(II), NICKEL(II), AND COPPER(II)

ABSTRACT In this study, a new dioxime ligand, 1,10-phenanthrolino-(5,6-b)-2,3-dihydyroxyimino-1,4-diazin was synthesized from the reaction of 5,6-diamino-1,10-phenanthroline with anti-dichloroglyoxime. Polymeric complexes with Ni(II), Co(II) and Cu(II) have been obtained. The new compounds have been characterized by FTIR, 1H NMR (DMSO-d6), elemental analyses and magnetic measurements. The ligand and the Ni(II), Co(II) and Cu(II) complexes have been studied potentiometrically. The metal to the ligand ratio of the Cu(II), Ni(II) and Co(II) complexes was found to be 1:1. The Co(II), Ni(II) and Cu(II) complexes of the ligand are paramagnetic. Protonation constants of the ligand and overall formation constants of the complexes have been calculated from potentiometric data using the program TITFIT.

Tetra- and octa-[4-(thiophen-3-yl)phenoxy]-bearing metal-free and Lu(III) phthalocyanines: synthesis, characterisation and investigation of photophysical properties

4-[4-(Thiophen-3-yl)phenoxy]phthalonitrile and 4,5-bis[4-(thiophen-3-yl)phenoxy]phthalonitrile and their corresponding tetra- and octa-substituted metal-free and Lu(III) phthalocyanine derivatives have been synthesised. The aggregation behaviour of the phthalocyanine compounds has been investigated in different solvents and concentrations and the effects of the substituent and the lutetium on their photophysical properties are reported.

Synthesis and fluorescence properties of metalloporphyrazines carrying 2-(ethyl)-1,3-dioxanethio-groups

The synthesis, photophysical and spectroscopic properties of soluble 2-(ethyl)-1,3-dioxanethio-substituted metal-free and metalloporphyrazines containing Mg(II), Zn(II), Co(II) and Ni(II) are reported. The aggregation behaviour of these compounds was investigated in different solvents and concentrations. The effects of the substituent and the nature of the metal ion on the photophysical parameters of the Mg(II), Zn(II), Co(II) and Ni(II) porphyrazines are also reported.

Synthesis and characterization of new D-π-D type Schiff base ligands and its complexes with Cobalt(II), Ruthenium(II)

A Schiff base ligands, N-{(1E,2E)-3-[4-(dimethylamino)phenyl]prop-2-en-1-ylidene}-1,10-phenanthrolin-5-amine(mpa) and (1E,2E)-3-[4-(dimethylamino)phenyl]acrylaldehyde9H-fluoren-9-ylidenehydrazone(mfh), have been synthesized from the reaction of 4,5-diazafluorenone-9-hydrazone and 5-amino-1,10-phenanthroline with 4-(dimethylamino)cinnamaldehyde. The Co(II) and Ru(II) complexes of the ligands were prepared and characterized. The metal-to-ligand ratio of the Co(II) complex was found to be 2: 1 and that of the Ru(II) complex was found to be 1: 1. The ligands and complexes have been characterized by FTIR, UV-visible, 1H NMR and fluorescence spectra, as well as, elemental analyses, TGA-DSC-DTG and mass spectra.