Bayram Gündüz

Synthesis, Characterization of Poly(E)-3-amino-4-((3-bromophenyl)diazenyl)- 1H-pyrazol-5-ol: Investigation of Antibacterial Activity, Fluorescence, and Optical Properties

The oxidative polycondensation reaction conditions of (E)-3-amino-4-((3-bromophenyl)diazenyl)-1H-pyrazol-5-ol (Schiff base monomer) has been accomplished using NaOCl, and air O2 oxidants in an aqueous alkaline medium. The optical conductivity, dielectric and optical properties of synthesized poly(Schiff base) were examined. The magnitude of the refractive index decreases with increasing of photon energy up to about 2.5 eV, then refractive index of the poly(Schiff base) increases with increasing of photon energy. The E0 and Ed values of the poly(Schiff base) were found to be 5.34 and 9.22 eV, respectively. An indirect energy-gap value of the poly(Schiff base) was found to be 0.94±0.009 eV. A direct energy-gap value of the poly(Schiff base) was found to be 1.38±0.01 eV and 1.96±0.009 eV at first region and second region, respectively. Absorption coefficient K changes from 11.87 to 18.25 cm−1. In addition to fluorescence property of poly(Schiff base) was investigated. Finally, poly(Schiff base) and Schiff base monomer were tested for antibacterial activities against some bacteria.

Synthesis and characterization of conjugated polymers containing phenyl and bithiophene: controlling of optical properties with molarity

Conjugated polymers containing phenyl and bithiophene units are synthesized by conventional polycondensation and crossing-coupling method of carboxylic acids with halides. The structure of both polymers formed by adding the ester group to the first polymer was confirmed by means of Fourier transform infrared (FTIR), nuclear magnetic resonance techniques, differential scanning calorimetry, and thermogravimetry and elemental analysis. The molecular weight distribution values of polymers were determined with a gel permeation chromatography (GPC) system. The optical properties of these different polymers with synthesis methods and structures were investigated for different molarities. The molar extinction coefficient values of the polymers decrease with increasing molarity. Transmittance (T) values of the polymers are increased with ester group addition and decreasing molarity. We obtained two types (direct and indirect allowed band gaps) of band gaps. The direct allowed optical band gap (Egd) values of poly(2,2′ bithiophene terephthalate) (polyBTTP) are lower than the indirect allowed optical band gap (Egid) values of poly(5-phenyl-2,2′ bithiophene) (polyPBT). The direct and indirect allowed band gap values of the polymers can be decreased with ester group addition and increasing molarity. The refractive index of the polymers can be decreased with decreasing molarity, increasing wavelength, and ester group addition.

Unsymmetrical pyrazole-based new semiconductor oligomer: synthesis and optical properties

Poly(p-phenylene-1-(2,5-dimethylphenyl)-5-phenyl-1H-pyrazole-3,4-dicarboxy amide) (poly(PDPPD)) was synthesized from reactions of p-phenylene-diamine and 1-(2,5-dimethylphenyl)-5-phenyl-1H-pyrazole-3,4-dicarbonyl dichloride (monomer) by heating under solvent. This newly synthesized poly(PDPPD) was characterized by 1H, 13C-NMR, FT-IR, gel permeation chromatography (GPC). In addition, we investigated optical properties of the poly(PDPPD) containing the substituted pyrazole ring at different molarities. The average transmittance (Tavg) values of the poly(PDPPD) in the visible (V) region were higher than the Tavg values in the near-ultraviolet (NU) region. The Tavg values of the poly(PDPPD) in the NU and visible (V) region decreased with increasing molarity. The absorption band edge (Absbe) value of the poly(PDPPD) decreased with increasing molarity. It was observed that the optical band gap (Eg) of the poly(PDPPD) value decreased more with increasing molarity. The refractive index of the poly(PDPPD) decreased with increasing wavelength and decreasing molarity. The structure of the poly(PDPPD) in the lowest energy was optimized by DFT calculation and its HOMO–LUMO orbitals were plotted.

Controlling of the optical properties of the solutions of the PTCDI-C8 organic semiconductor

N,N′-Dioctyl-3,4,9,10 perylenedicarboximide (PTCDI-C8) organic semiconductor have vast applications in solar cells, thermoelectric generators, thin film photovoltaics and many other optoelectronic devices. These applications of the materials are based on their spectral and optical properties. The solutions of the PTCDI-C8 for different molarities were prepared and the spectral and optical mesaurements were analyzed. Effects of the molarities on optical properties were investigated. Vibronic structure has been observed based on the absorption bands of PTCDI-C8 semiconductor with seven peaks at 2.292, 2.451, 2.616, 3.212, 3.851, 4.477 and 4.733 eV. The important spectral parameteres such as molar/mass extinction coefficients, absorption coefficient of the PTCDI-C8 molecule were calculated. Optical properties such as angle of incidence/refraction, optical band gap, real and imaginary parts of dielectric constant, loss factor and electrical susceptibility of the the PTCDI-C8 were obtained. Finally, we discussed these parameters for optoelectronic applications and compared with related parameters in literature.

Axially phenoxy-derivative disubstituted phthalocyanine: synthesis, characterization and photophysical properties

We report the highly soluble axially disubstituted 4-(methoxymethyl) phenol silicon (IV) (1) phthalocyanine which was synthesized by the reaction of silicon phthalocyanine dichloride (SiPcCl2) with 4-(methoxymethyl)phenol. UV–Vis, FT-IR, 1H, 13C, NMR and mass spectrometry were used to characterize SiPc (1). Fluorescence quantum yield (spectral and photophysical) characteristics of SiPc (1) were investigated for various solvents. The obtained spectral and photophysical results indicated that the fluorescence quantum yields (ΦF) of SiPc (1) are both lower than unsubstituted ZnPc and SiPcCl2 in the solvents used which is not typical of silicon-phthalocyanines. The effects on optoelectronic and spectral properties of SiPc (1) of solvents and concentrations were investigated in detail. We obtained absorption band edge, maximum peak of absorbance, molar and mass extinction coefficients, refractive index, optical band gap, optical and electrical conductance of SiPc (1) for different solvents and concentrations. We obtained the refractive index values of SiPc (1) with many relationships. Also, we investigated the angles of incidence and refraction of SiPc (1). SiPc (1) exhibited semiconductor behavior in terms of optical band gap and can be used for photonic applications.Graphical Abstract

Synthesis, characterization, and optical and surface properties of (4-(trifluoromethylthio)phenoxy) copper(II) phthalocyanine

This paper reports on the synthesis and characterization of a non-peripherally tetra-substituted copper phthalocyanine containing a 4-(trifluoromethylthio)phenoxy group. The synthesized compounds have been characterized using elemental analysis, FTIR, 1H NMR, 13C NMR, MALDI-TOF, SEM and UV-vis spectral data. The crystal structure of 3-(4-(trifluoromethylthio)phenoxy)phthalonitrile (1) was confirmed by single-crystal X-ray diffraction. The crystallographic information file (cif) was uploaded to the data center with CCDC 1538643. We investigated the UV-vis spectra, band edge, band gap, refractive indices, dispersion, sensing, conductance and dielectric properties. The surface morphological properties of the Cu(II)Pc (2) film were investigated under different conditions.

Required theoretical and experimental physical characteristics of tris[4-(diethylamino)phenyl] amine organic material

In here, we investigated the required theoretical and experimental physical characteristics such as potential energy surface scan, optimized structure, vibrational spectra, electronic band structure, molecular electrostatic potential surface, optical and optoelectronic behaviors of the tris[4-(diethylamino)phenyl] amine (TDAPA) for different solvents (DMF and chloroform) and techniques (experimental and theoretical). We obtained the significant, interesting, same and different results for them. We obtained the refractive indices of the TDAPA for various conditions. The TDAPA exhibits a normal dispersion behavior in visible region. TDAPA organic material is suitable for optoelectronic devices and applications such as metal–organic semiconductor diodes due to the appropriate properties.

Fundamental properties of PTCDI-C8 semiconductor for optoelectronic and photonic applications

In this study, we investigated fundamental properties such as electrical and optical properties of the N,N′-Dioctyl-3,4,9,10 perylenedicarboximide (PTCDI-C8) Organic Semiconductor (OSC) material for optoelectronic and photonic applications. The important spectral parameters such as mass extinction coefficient and transmittance spectrum of the PTCDI-C8 molecule were calculated. Optical properties such as refractive index, optical band gap, real and imaginary parts of dielectric constants of the PTCDI-C8 were obtained. The electrical and optical conductance properties were also investigated. The advantages and disadvantages of obtained fundamental parameters were determined for optoelectronic and photonic applications.