Gürkan Keşan

ORCID: 0000-0002-7812-6872
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About
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Research Areas
  • Nonlinear Optical Materials Research
  • Photosynthetic Processes and Mechanisms
  • Antioxidant Activity and Oxidative Stress
  • Structural and Chemical Analysis of Organic and Inorganic Compounds
  • X-ray Diffraction in Crystallography
  • Crystallization and Solubility Studies
  • Molecular spectroscopy and chirality
  • Algal biology and biofuel production
  • Crystallography and molecular interactions
  • Spectroscopy and Quantum Chemical Studies
  • Luminescence and Fluorescent Materials
  • Porphyrin and Phthalocyanine Chemistry
  • Crystal structures of chemical compounds
  • Molecular Sensors and Ion Detection
  • Molecular Spectroscopy and Structure
  • Organic Chemistry Cycloaddition Reactions
  • Synthesis and Biological Evaluation
  • Organic Light-Emitting Diodes Research
  • Synthesis and biological activity
  • Metal complexes synthesis and properties
  • Retinoids in leukemia and cellular processes
  • Synthesis and Reactivity of Sulfur-Containing Compounds
  • Molecular Junctions and Nanostructures
  • Magnetism in coordination complexes
  • Seaweed-derived Bioactive Compounds

University of South Bohemia in České Budějovice
2012-2024

Gebze Technical University
2018-2020

Nemocnice České Budějovice
2018-2020

Institute of Biophysics
2018

Sewanee: The University of the South
2013-2014

Non-covalent functionalization of single wall carbon nanotubes (SWCNTs) has been conducted using several binding agents with surface π-interaction forces in recent studies. Herein, we present the first example non-covalent sidewalls SWCNTs thienothiophene (TT) derivatives without requiring any agents. Synthesized TT derivatives, TT-CN-TPA, TT-CN-TPA2 and TT-COOH-TPA, were attached directly to through interactions obtain new TT-based SWCNT hybrids, HYBRID 1-3. Taking advantage presence sulfur...

10.1039/d2nr04582f article EN Nanoscale 2022-01-01

Two carotenoids with aryl rings were studied by femtosecond transient absorption spectroscopy and theoretical computational methods, the results compared those obtained from their nonaryl counterpart, β-carotene. Although isorenieratene has more conjugated C═C bonds than β-carotene, its effective conjugation length, Neff, is shorter of This evidenced a longer S1 lifetime higher energy to values for On other hand, although renierapurpurin have same π-electron chain structure, Neff different...

10.1021/jp512354r article EN The Journal of Physical Chemistry B 2015-01-05

Solution-processed organic photodiodes can function as thin-film candidates for solid-state photosensors in various optoelectronic applications due to the physical and chemical tuneability.

10.1039/c9nj05662a article EN New Journal of Chemistry 2020-01-01

Excited-state properties of monomeric and aggregated carbonyl carotenoid 8'-apo-β-carotenal were studied by means femtosecond transient absorption spectroscopy. For monomers, the polarity-dependent behavior characteristic carotenoids with conjugated group was observed. In n-hexane S(1) lifetime is 25 ps, but it shortened to 8 ps in methanol. This shortening accompanied appearance new spectral bands spectrum. On basis analysis spectra methanol, we propose that polarity-induced are due...

10.1021/jp310140k article EN The Journal of Physical Chemistry A 2012-11-25

In this study, subphthalocyanine–borondipyrromethene conjugates have been successfully designed and synthesized.

10.1039/c7nj04568a article EN New Journal of Chemistry 2018-01-01

In order to estimate the possible structure of unknown carbonyl carotenoid related isofucoxanthin from Chromera velia denoted as isofucoxanthin-like (Ifx-l), we employed steady-state and ultrafast time-resolved spectroscopic techniques investigate properties Ifx-l in various solvents. The results were compared with those measured for carotenoids known structure: fucoxanthin (Fx) (Ifx). experimental data complemented by quantum chemistry calculations molecular modeling. show that must have...

10.1021/acs.jpcb.5b08152 article EN The Journal of Physical Chemistry B 2015-09-12

We used ultrafast transient absorption spectroscopy to study excited-state dynamics of the keto-carotenoid fucoxanthin (Fx) and its two derivatives: 19′-butanoyloxyfucoxanthin (bFx) 19′-hexanoyloxyfucoxanthin (hFx). These derivatives occur in some light-harvesting systems photosynthetic microorganisms, their presence is typically related stress conditions. Even though hexanoyl (butanoyl) moiety not a part conjugated system hFx (bFx), spectra polar solvents exhibit more pronounced vibrational...

10.1021/acs.jpcb.8b00743 article EN The Journal of Physical Chemistry B 2018-02-22

10.1016/j.saa.2013.09.095 article EN Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 2013-10-08
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