Browsing by Author "Ozcan, Emrah"

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Citation - WoS: 11
Citation - Scopus: 12
External Complexation of Bodipys by Cb[7] Improves In-Cell Fluorescence Imaging
(Royal Soc Chemistry, 2022) Ayhan, Mehmet Menaf; Ozcan, Emrah; Alkan, Fahri; Cetin, Metin; Un, Ilker; Bardelang, David; Cosut, Bonyemin; 01. Abdullah Gül University
Organic luminescent compounds with high emission properties play a crucial role in fluorescence labelling and optoelectronic devices. In this work, we prepared three water soluble BODIPY derivatives (B-4, B-5, and B-6) which are weakly fluorescent due to non-radiative relaxation pathways (charge transfer: CT or heavy atom effect). However, CB[7] significantly improves BODIPY fluorescence by similar to 10 fold for B-4, and by similar to 3 fold for B-5. The (TD)DFT analyses suggest that for B-4 and B-5, the CT state is blue-shifted as a result of the external binding of CB[7] near the pyridinium groups. This effect favoured a radiative decay through a locally-excited (LE) pi ->pi* transition state of BODIPYs resulting in a CB[7]-induced emission increase in solution (and in the solid state), without compromising singlet-to-triplet intersystem crossing (ISC). The improved emission of the BODIPY center dot CB[7] complexes was used for the fluorescence imaging of U87 cells illustrating the relevance of this approach. These results suggest that BODIPY center dot CB[7] complexes could be used as theragnostic agents by combining fluorescence imaging and treatment by photodynamic therapy.
Labyrinthine Microstructures with a High Dipole Moment Boron Complex for Molecular Physically Unclonable Functions
(Amer Chemical Soc, 2025) Yildiz, Tevhide Ayca; Kiremitler, N. Burak; Kayaci, Nilgun; Kalay, Mustafa; Ozcan, Emrah; Deneme, Ibrahim; Usta, Hakan; 02.07. Malzeme Bilimi ve Nanoteknoloji Mühendisliği; 01. Abdullah Gül University; 02. Mühendislik Fakültesi; 10. Rektörlük
The design and development of novel molecular-physically unclonable functions (PUFs) with advanced encoding characteristics and ease of fabrication have recently attracted attention in cryptography, secure authentication, and anticounterfeiting. Here, we report the development of a new high dipole-moment small molecule, InIm-BF2, a difluoroborate complex of an indolyl-imine ligand, and the fabrication of unique labyrinthine patterns through a facile two-step thin film process under ambient conditions. The new molecule has a dipolar, coplanar pi-backbone and arranges in the solid state with antisymmetric cofacial pi-stackings (3.86 & Aring;). These properties, along with short C-Hpi contacts (2.74-2.88 & Aring;) and nonclassical C-HF hydrogen bonds (2.47-2.51 & Aring;) (23.4% and 11.5% of the Hirshfeld surfaces, respectively), drive the formation of amorphous molecular PUF patterns with disordered, short-range interactions. Spin-coating followed by thermal annealing at a moderate temperature produces nanoscopic molecular thin films with intricate labyrinthine patterns. These patterns, characterized by interconnected, irregularly shaped, micron-sized (approximate to 50-100 mu m) features, exhibit excellent PUF characteristics, verified through advanced image analysis and computational algorithms. Unlike randomly positioned isolated features in classical binarized keys, the interconnected labyrinthine patterns possess rich entropy and complex features, directly authenticated via deep-learning methodologies. Our work not only demonstrates a facile, promising approach to fabricating unique high-entropy PUF patterns but also provides critical insights into designing advanced molecular materials for next-generation security applications.
Citation - WoS: 18
Citation - Scopus: 19
A Solution-Processable Meso-Phenyl N-Channel Semiconductor With Enhanced Fluorescence Emission
(Wiley-VCH Verlag GmbH, 2019) Ozcan, Emrah; Ozdemir, Mehmet; Ho, Dongil; Zorlu, Yunus; Ozdemir, Resul; Kim, Choongik; Cosut, Bunyemin; 01. Abdullah Gül University
The cover feature shows the delicate balance between locally excited (LE) and twisted intramolecular charge-transfer (TICT) states, which could be controlled by solvent polarity and nano-aggregation, of a meso-phenyl-BODIPY-based fluorescent semiconductor. The dihedral angle between the meso-aromatic unit and BODIPY pi-core was found to be the key factor in this balance. This is the first report of highly emissive characteristics for an A-D-A type BODIPY-based n-channel semiconductor. Details are given in the Full Paper by B. Cosut, H. Usta, C. Kim, and co-workers (DOI: 10.1002/cplu.201900317).