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    Crystal chemistry, DFT calculation and optical properties of the double perovskite stannate Sr2Sn0.8In0.8W0.4O6
    (Elsevier, 2022) Belgacem, Besma; Maslov, Mikhail M.; Kaya, Savas; Ali, Ismat H.; Ben Hassen, Rached
    Sr2Sn0.8In0.8W0.4O6 double perovskite powder was, first, prepared following an experimental study on the effects of substitutions of In and W in the high transparent strontium stannate SrSnO3 (SSO). The high temperature solid state reaction method was adopted for the preparation of the desired phase. Further, the W and In substitution's effects on the variation of the electronic structure was investigated theoretically by density functional theory (DFT) calculations. Rietveld's refinement of the X-ray diffraction pattern announces a tetragonal symmetry of the crystal lattice (I4/m), characterized by a reduction in octahedral inclinations due to double substitution. IR absorption spectroscopy announced the presence of carbonates and water molecules due to moisture-swing sorption and confirmed by TG analysis. The optical properties studied by UV-Vis spectroscopy have shown that the material is transparent in the visible region of the spectrum. A band gap of 3.46 eV was calculated using Tauc plot, indicating a possible semiconducting behavior. (C) 2022 Elsevier B.V. All rights reserved.
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    Inhibitive performance of novel/eco-friendly pyrimidine derivative for Q235 steel protection in 15% HCl under hydrodynamic condition: Combination of experimental, surface and computational approach
    (Elsevier, 2022) Singh, Ambrish; Ansari, K. R.; Lin, Yuanhua; Ali, Ismat H.; Kaya, Savas; El Ibrahimi, Brahim
    The developing effective and eco-friendly corrosion inhibitor plays a vital role in protecting Q235 steel in acid solution. Accordingly, novel pyrimidine derivatives, namely 4-Amino-2-phenyl-1,2-dihydrobenzo[4,5]imidazo[1,2-a]pyrimidine-3-carbonitrile (APC), were synthesized and applied as the corrosion inhibitor under hydrodynamic conditions in 15% HCl. The inhibition performance was investigated by weight-loss experiment, potentiodynamic polarization curve, electrochemical impedance test, scanning electron microscope (SEM), atomic force microscopy (AFM), contact angle measurement, and X-ray photoelectron spectroscopy. The research showed that APC exhibited good inhibition nature for Q235 steel in 15% HCl medium, and the inhibition efficiency is correlated with APC concentration. The change of impedance parameters showed that the corrosion inhibitor adsorbs on the surface of Q235 steel in forming a protective film. The protective performance results come to 92.83% at 400 mg/L. Langmuir isotherm represents the excellent fitting. SEM, AFM, and XPS observation on the surface of Q235 steel showed that the metal matrix has a good anti-corrosion effect in the corrosion inhibitor solution. Density functional theory (DFT) and Molecular dynamic simulation (MD) were used to determine the inhibitor's and metal interactions' relationship.
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    Synthesis, experimental and theoretical characterization of (E)-2-((2,3-dimethylphenyl)amino)-N?-(furan-2-ylmethylene) benzohydrazide
    (Elsevier, 2020) Albayati, Mustafa R.; Kansiz, Sevgi; Lgaz, Hassane; Kaya, Savas; Dege, Necmi; Ali, Ismat H.; Salghi, Rachid
    Hydrazone derivatives have drawn much attention because of their large pharmacological applications. In the present work, the compound (E)-2-((2,3-dimethylphenyl)amino)-N'-(furan-2-ylmethylene)benzohydrazide, noted C20H19N3O2 was synthesized, and its 3D structure was determined by X-ray crystallography. Structural characterization by X-ray crystallography was supported by Density Functional Theory (DFT) and Hartree Fock (HF) calculations. Intermolecular interactions in the crystal network were determined using Hirshfeld surface analyses. The optimized geometry, global reactivity descriptors, Natural Bond Orbital (NBO) analysis, and HOMO-LUMO of the molecule were computed using the DFTB3LYP method and 6-311++G (d,p) basis set. The C20H19N3O2 has a monoclinic system and P2(1)/c space group with parameters a = 13.8181 (10) angstrom, b = 16.1969 (10) angstrom, c = 8.1285 (7) angstrom, b = 104.546 (6)degrees and Z = 4. It forms an S(6) ring motif with an intramolecular NdH center dot center dot center dot O hydrogen bond. Hirshfeld surface analysis and 2D fingerprint plots signify meaningful interactions in crystal packing [H center dot center dot center dot H (47.2%), C center dot center dot center dot H/ H center dot center dot center dot C (29%), and O center dot center dot center dot H/H center dot center dot center dot O (13.3%) contacts]. Atomic charges were predicted using the Mulliken population and the NBO theory. The molecular electrostatic potential (MEP) picture was drawn using the same level of theory to visualize the chemical reactivity and charge distribution on the molecule. The local reactivity was examined by determining the Fukui functions and dual descriptor indices. (C) 2020 Elsevier B.V. All rights reserved.