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14 results on '"Ozcelik, Egemen."'

3. Design, Synthesis, and Theoretical Studies on the Benzoxadiazole and Thienopyrrole Containing Conjugated Random Copolymers for Organic Solar Cell Applications.

Author

Karakurt, Oguzhan, Oral, Pelin, Hacioglu, Serife Ozdemir, Yılmaz, Eda Alemdar, Haciefendioğlu, Tuğba, Bicer, Umran Isil, Ozcelik, Egemen, Ozsoy, Gonul Hizalan, Yildirim, Erol, Toppare, Levent Kamil, and Cirpan, Ali

Subjects
DENSITY functional theory, SOLAR cells, MOIETIES (Chemistry), SELENOPHENE, OPTICAL properties
Abstract

In this study, six different donor‐π‐acceptor1‐π‐donor‐acceptor2 type random co‐polymers containing benzodithiophene as a donor, benzooxadiazole (BO), and thieno[3,4‐c]pyrrole‐4,6‐dione (TPD) as acceptor, have been synthesized and characterized. In addition to the acceptor core ratio at different values, the effect of aromatic bridge structures on the optical, electronic, and photovoltaic properties of six different random co‐polymers is investigated by using thiophene and selenophene structures as aromatic bridge units. To investigate how the acceptor unit ratio and replacement of aromatic bridge units impact the structural, electronic, and optical properties of the polymers, density functional theory (DFT) calculations are carried out for the tetramer models. The open‐circuit voltage (VOC), which is strongly correlated with the HOMO levels of the donor material, is enhanced with the increasing ratio of the TPD moiety. On the other hand, the short‐circuit current (JSC), which is associated with the absorption ability of the donor material, is improved by the increasing ratio of BO moiety with the π‐bridges. BO moiety dominant selenophene π‐bridged co‐polymer (P4) showed the best performance with a power conversion efficiency (PCE) of 6.26%, a JSC of 11.44 mA cm2, a VOC of 0.80 V, and a fill factor (FF) of 68.81%. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Design, Synthesis, and Theoretical Studies on the Benzoxadiazole and Thienopyrrole Containing Conjugated Random Copolymers for Organic Solar Cell Applications

Author

Karakurt, Oguzhan, primary, Oral, Pelin, additional, Ozdemir Hacioğlu, Serife, additional, Alemdar Yilmaz, Eda, additional, Haciefendioglu, Tugba, additional, Bicer, Umran isil, additional, Ozcelik, Egemen, additional, Hizalan Ozsoy, Gonul, additional, Yildirim, Erol, additional, Toppare, Levent, additional, and Cirpan, Ali, additional

Published
2024
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9. PHENYLETHYLAMINE DERIVATIVE OF CALIX[4]ARENE SCHIFF BASE FOR FLUOROMETRIC DETECTION OF ZINC ION.

Author

OZCELIK, Egemen, NG'ANDU, Clever, TABAKCI, Begum, and TABAKCI, Mustafa

Subjects
PHENETHYLAMINES, ZINC ions, CALIXARENES, SCHIFF bases, FLUOROPHORES
Abstract

As a Zn2+ fluorescent probe, we have designed and synthesized a new type of calixarene Schiff-base ligand (L) possessing a 1-phenylethylamine group as the fluorophore and the receptor. As only Zn2+ caused a significant increase in fluorescence emission intensity at 480 nm and the limit of detection (LOD) reached 4.8 x 10-7 M, the synthesized fluorescent probe L demonstrated high selectivity and sensitivity towards Zn2+ compared to other metal ions. In addition, the formation of a 1:1 complex between probe L and Zn2+ was determined. As a consequence, it was determined that probe L can be utilized for the detection and monitoring of Zn2+ in the environment. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Rapid and real-time detection of arginine enantiomers by QCM sensor having a Calix[4]arene receptor bearing asymmetric centers

Author

Farabi Temel, Mustafa Tabakci, Egemen Ozcelik, Begum Tabakci, Serkan Erdemir, Selçuk Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Temel, Farabi, Erdemir, Serkan, Ozcelik, Egemen, and Tabakci, Mustafa

Subjects
Detection limit, Arginine, Central composite design, Chemistry, 010401 analytical chemistry, 02 engineering and technology, Quartz crystal microbalance, 021001 nanoscience & nanotechnology, 01 natural sciences, Combinatorial chemistry, 0104 chemical sciences, Analytical Chemistry, Amino acid, Calixarene, Sensing, Racemic mixture, Moiety, Enantiomer, 0210 nano-technology, Sensor
Abstract

WOS: 000480664200019, PubMed: 31357279, This paper describes the sensing studies of a chiral calix[4]arene receptor (5) having (R)-2-phenylglycinol moiety for arginine enantiomers (D-/L-arginine) by using Quartz Crystal Microbalance (QCM) technique. The initial experiments have revealed that the chiral calix[4]arene 5 coated QCM (CCC-QCM) sensor showed good sensing for arginine enantiomers, such that it has exhibited higher sensing towards D-arginine than that of L-arginine. It has been determined that the sensitivity, limit of detection values of CCC-QCM sensor for the D-/L-arginine solutions as 0.024/0.023 Hz/mu M and 0.38/1.29 mu M, respectively. On the other hand, the racemic mixture studies were optimized using the response surface methodology with central composite design. Consequently, it has been demonstrated that the QCM sensor modification with a calix[4]arene receptor bearing asymmetric centers provided rapid, real-time, sensitive and effective sensing of arginine enantiomers., Scientific and Technological Research Council of Turkey (TUBITAK-Grant)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [115Z249]; Research Foundation of the Selcuk UniversitySelcuk University [16401003]; Konya, Turkey, We thank the Scientific and Technological Research Council of Turkey (TUBITAK-Grant Number 115Z249) and the Research Foundation of the Selcuk University (SUBAP-Grant Number 16401003), Konya, Turkey and for financial support of this work produced from Farabi Temel's Ph.D. Thesis.

Published
2019

14. QCM sensors coated with calix[4]arenes bearing sensitive chiral moieties for chiral discrimination of 1-phenylethylamine enantiomers

Author

Egemen Ozcelik, Farabi Temel, Serkan Erdemir, Mustafa Tabakci, Begum Tabakci, Selçuk Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü, Ozcelik, Egemen., Temel, Farabi., and Tabakci, Mustafa.

Subjects
Detection limit, Langmuir, 010405 organic chemistry, Organic coatings, General Chemistry, Quartz crystal microbalance, engineering.material, 010402 general chemistry, Condensed Matter Physics, 01 natural sciences, Combinatorial chemistry, 0104 chemical sciences, chemistry.chemical_compound, 1-Phenylethylamine, chemistry, Coating, Calixarene, engineering, Freundlich equation, Enantiomer, Quartz crystal microbalance sensor, Enantiomeric discrimination, Food Science
Abstract

WOS: 000485967900003, This article describes the enantiomeric discrimination properties of new chiral calix[4]arene derivatives bearing (S)-/(R)-1-phenylethylamine moieties (5a and 5b, respectively) towards the 1-phenylethylamine enantiomers on QCM surface. Initial experiments demonstrated that the 5b coated QCM sensor was the most effective sensing material for enantiomeric discrimination of (R)-/(S)-1-phenylethylamine by exhibiting much more sensing ability towards (R)-enantiomer than (S)-enantiomer. Sensitivity, detection limit and time constant of the 5b coated QCM sensor has been were calculated as 0.082 Hz/mu M, 2.7 mu M, and 319.2 s, respectively. Additionally, effects of calixarene content and different coating technique on enantiomeric discrimination, and Langmuir and Freundlich isotherms of the sensing results also were studied. As a result, it has been demonstrated that the coating of QCM sensor with a chiral calix[4]arene (5b) having (S)-1-phenylethylamine moieties provides substantially enantiomeric discrimination of 1-phenylethylamine enantiomers., Technical Research Council of Turkey (TUBITAK-Grant) [115Z249]; Research Foundation of the Selcuk UniversitySelcuk University [16401003]; Konya, Turkey, We thank the Technical Research Council of Turkey (TUBITAK-Grant No. 115Z249) and the Research Foundation of the Selcuk University (SUBAP-Grant No. 16401003), Konya, Turkey and for financial support of this work produced from Egemen Ozcelik's M.Sc. Thesis.

Published
2019

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