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    A detailed study on the optical properties of 3-benzoyl-7-hydroxy coumarin compound in different solvents and concentrations
    (Macedonian Journal of Chemistry and Chemical Engineering, 2019) Kurt, Adnan; Gündüz, Bayram; Koca, Murat
    A coumarin-derived compound, 3-benzoyl-7-hydroxy coumarin (BHYC), is synthesized to determine its optoelectronic properties, including absorbance band edge, optical band gap, transmittance, refractive index, electrical susceptibility, volume-surface energy loss functions and optical/electrical conductance parameters. The absorbance spectra of BHYC in dimethylformamide (DMF) and dimethylsulfoxide ( DMSO) solvents exhibit maximum peaks at 350 and 353 nm, respectively, in the near-ultraviolet region. The absorbance band edge values of BHYC in DMF and DMSO are 2.526 and 2.500 eV, respectively. The optical band gap of BHYC varies from 2.560 to 2.408 eV with increasing molarity. In contrast, the refractive index of BHYC increases from 2.47 to 2.95 with changing molarity. The obtained results show that 3-benzoyl-7-hydroxy coumarin exhibits a semiconductor behavior and it may be an important candidate for many optoelectronic devices, such as diodes, photodiodes and sensors.
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    Optoelectronic Properties of a Newly Synthesized Electro-Optically Active Heterocyclic Compound Including Pyrazole, Coumarin and Acrylonitrile Groups
    (Springer Heidelberg, 2025) Kurt, Adnan; Gunduz, Bayram; Onyilmaz, Mehmet; Koca, Murat
    In the present work, a new molecule with high pi-bond conjugation containing the pyrazole, coumarin and acrylonitrile groups, which are important for optoelectronic technology, was synthesized by the reaction of 3-(2-oxo-2H-chromen-3-yl)-1-phenyl-1H-pyrazole-4-carbaldehyde and phenylacetonitrile in the presence of pyridine, catalytic amount of piperidine and DMF solvent. This molecule was named as 3-(3-(2-oxo-2H-chromen-3-yl)-1-phenyl-1H-pyrazol-4-yl)-2-phenylacrylonitrile (OCPAN). The spectral characterization was performed by FTIR, 1H and 13C-NMR techniques. UV-VIS measurements were carried out on a series of solutions prepared at various concentrations in DMF, across a wavelength range of 200-1000 nm. The optical and optoelectronic properties of the newly synthesized compound were thoroughly analyzed, and the effect of concentration on these properties was also investigated. Important optical and optoelectronic parameters such as absorption optical band edge, optical band gap, refractive index, incidence angle, refraction angle, contrast, optical conductance, and electrical conductance were determined. The optical band gap of the OCPAN molecule decreased from 3.202 to 3.036 eV as its concentration increased from 0.007 to 0.176 mM. These results confirm that the OCPAN molecule exhibits semiconductor characteristics.
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    A study on the optoelectronic parameters of 4-chloromethyl-7-hydroxy coumarin in various solvents and concentrations
    (Türkiye Kimya Derneği, 2021) Kurt, Adnan; Gündüz, Bayram; Koca, Murat
    A coumarin derivative, namely 4-chloromethyl-7-hydroxy coumarin (CMEHC), was synthesized in order to test the concentration and solvent effect on its optical properties. The spectral characterization of this compound was accomplished by FTIR and 1H-NMR techniques. The UV absorption spectra of CMEHC compound in various solvents (THF, DMSO, DMF) were recorded with a UV–VIS spectrophotometer. The optical parameters such as maximum peak position, absorption band edge, and direct allowed bandgap were reported for these solvents and also various concentrations. The lowest direct allowed bandgap was obtained with THF. The absorbance spectra of CMEHC compound were dominant at the near ultraviolet region. The refractive index values were compared with each other using Moss, Ravindra, Herve-Vandamme, Reddy and Kumar-Singh relations.