Welcome to IKU Academic Digital Archive System
OpenAccess@IKU is Istanbul Kultur University's Academic Digital Archive System, established in June 2014 to digitally store and provide open access to academic and artistic outputs in line with international standards and intellectual property rights. The system includes various outputs such as articles, presentations, theses, books, book chapters, reports, encyclopedias, and works of art produced by the university's faculty members and students.
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Infrared Spectrum and UV-Triggered Transformations of Matrix-Isolated Meta-Fluorothiophenol Supported by Ground and Excited State Theoretical Calculations
(Wiley, 2025) Jesus, A. J. Lopes; Lucena Jr, J. R.; Rodrigues, G. P.; ILDIZ, GÜLCE ÖĞRÜÇ; do Monte, S. A.; FAUSTO, RUI
The infrared (IR) spectrum of meta-fluorothiophenol (mFTP) isolated in a low-temperature N-2 matrix was recorded and interpreted with the aid of B3LYP vibrational frequency calculations for both cis and trans conformers. Then, photochemical transformations in the matrix-isolated compound were triggered through UV-Vis laser irradiations and their outcomes were monitored by IR spectroscopy. Upon excitation at lambda = 285 nm, thiol-to-thione phototautomerization was identified as the sole reaction pathway, leading to the formation of three thione isomers. Among them, the ortho-isomer where the hydrogen atom reattaches to the fluorine-substituted side of the aromatic ring was identified as the predominant photoproduct. Identification of the photoproducts was confirmed by comparing the emerging experimental spectra with the IR absorptions predicted for the candidate structures. The photoreaction was found to be reversible, as irradiation at lambda = 405 nm partially restored the reactant. The experimental results were complemented with the application of multireference/multiconfigurational (CASSCF, CASPT2, MR-CIS) and TD-DFT (TD-M062X, omega B97XD, and tau-HCTHhyb) methods to investigate the excited state properties of mFTP, including the simulation of its UV photoabsorption spectra. A comparative analysis of the results obtained by the different methods was performed. This combined experimental and theoretical approach provided valuable insights into the photochemical behavior and electronic structure of fluorinated thiophenols.
Chinese and Turkish Parents' Reflective Parenting: Accelerating Shifts in Contemporary Parenting During Pandemic Contexts
(Routledge Journals, Taylor & Francis Ltd., 2025) Lehner-Mear, Rachel; Xu, Yuwei; Liu, Chang; Yu, Yun; TORAN, MEHMET; Sak, Ramazan; Sahin-Sak, Ikbal Tuba
During the COVID-19 pandemic, particularly during periods of quarantine, parents and children were sometimes together in ways which contrasted their pre-pandemic life. This paper uses a reflective parenting lens and processual approach to analyse the quarantine experiences of twenty-four parents of three-to-six-year-olds from China and T & uuml;rkiye, gathered in semi-structured interviews. The paper reveals not only that Chinese and Turkish parents were reflective but that such reflections engaged with contemporary shifts in parenting, in particular: (i) the role of the parent; (ii) 'fixing' the child; (iii) the parent-child hierarchy; and (iv) grandparent involvement in parenting. The practicalities of the pandemic context are shown to enhance social evolution towards reflective parenting by increasing parent-child interaction. The paper also highlights that practising reflective parenting is sometimes challenging, uncomfortable and partial. Structural issues in Chinese and Turkish contemporary life which hinder reflective parenting are highlighted, including working patterns, grandparent involvement, and social scripts that interact with parenting practices. Reflective parenting, assumed to be less common in these contexts, may be inhibited by structural dimensions which had reduced impact in the quarantine period. However, when parents are reflective, they define their own practices and resist, at least in part, traditional notions of parenting.
Novel Tetradentate N2O2 Water-Soluble Schiff Base and Its Al(III) Complex: Synthesis, Structural Characterization, and Correlations Between Structure and Stability Against Hydrolysis
(Elsevier, 2025) Bouznif, Hajer; Justino, Licinia L. G.; Soares, Maria I. L.; Costa, Telma; Ramos, M. Luisa; Nikitin, Timur; Pinho e Melo, Teresa M. V. D.; Zouari, Nabil; FAUSTO, RUI
A novel water-soluble di-Schiff base, N,N'-bis(3-methoxy-5-sulfonatosalicylidene)-1,2-ethylenediamine disodium salt (MSS), was synthesized under both conventional heating and microwave-assisted conditions. Detailed characterization was conducted using various techniques including NMR, HRMS, UV_vis, SEM/EDX, DSC, ATRFTIR and Raman spectroscopies, accompanied by DFT calculations. The study discusses the enol-imine/ketoenamine tautomerism of MSS based on theoretical, solution and solid-state results, as well as the impact of intra- and intermolecular interactions on the balance between the tautomers. The enol-imine form was predicted as the most stable tautomer in gas phase. Nonetheless, the keto-enamine form was found to be the main tautomer in water, DMSO and in the solid state. To assess the stability of MSS and to study its complexation with Al(III) in aqueous and non-aqueous media, a combined spectroscopic and computational approach was used. The stability of MSS against hydrolysis was analyzed and compared with that of its non-substituted analogue. The differences found were interpreted based on the different tautomeric equilibria of the two Schiff bases and specific structural susceptibilities towards nucleophilic attack by water. The presented results impact on the development of more efficient strategies for the design of water-stable Schiff bases, highlighting the role of tautomerism in determining stability against hydrolysis. NMR data revealed the formation of a stable Al(III) complex with MSS and additional complexes with MSS degradation products in the pH range 4-7. The infrared and Raman results provided additional structural details and supported the aforesaid conclusions.
Multianalytical Characterization of Byzantine Wall Paintings by SEM-EDX, μ-XRD, Raman and FTIR Techniques
(TÜBİTAK, 2025) Şimşek, Onur; Özbaş, Fatih; Kaygısız, Ersin; Yasayan, Gözem; ILDIZ, GÜLCE ÖĞRÜÇ
In this study, various analytical methods were employed to examine the mineral based natural pigments in the frescoes of the medieval (9(th) century) Byzantine church, known today as the Atik Mustafa Pasha Mosque. The techniques include mu -X-ray diffraction (mu -XRD), Raman and Fourier transform infrared (FTIR) spectroscopies, and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). The SEM-EDX technique enabled the identification of the chemical element composition in the studied pieces, while Raman and FTIR spectroscopies, as well as XRD, allowed the identification of mineral phases and mineral based natural pigments in the paints of the frescoes. Fragments of various colors (red, black, yellow, green, pink, cream, and white) were investigated. The analyses showed that the red (and pink) tones were primarily due to hematite (Fe2O3), goethite (FeO(OH) and cinnabar (HgS), amorphous carbon (C) was used to achieve the black color. Yellow tones were mostly attributed to limonite (FeO(OH)nH(2)O) and the greens were the result of celadonite (K(Mg,Fe2+)(Fe3+,Al)[Si4O10](OH)(2)), while the white color was provided by calcite. The combined application of the different analytical methods used proved to be a powerful tool for identifying and determining the compositional makeup of the mineral based natural pigments present in the studied samples. This highlights the importance of a multi-analytical approach in characterizing the investigated historical wall paintings.