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    Öğe
    Synthesis and characterization of transition metal complex cationed heptaborate structures
    (Turkish Energy Nuclear and Mining Research Institute, 2023) Genç, Ahmet; Köse, Dursun Ali; Şahin, Onur
    In recent years, interest in the study of cyclic borate structures (hexaborate, heptaborate, etc.), which draws attention due to their piezoelectric properties, has increased. In the scope of our study, heptaborate rings using the transition metal cation coordination compound as cation were synthesized and tried to be structurally characterized by elemental analysis, melting point determination, FT-IR, TGA/DTA analysis, UV analysis, powder x-ray diffraction (P-XRD) analysis methods. The presence of the cationic coordination sphere in the structures was determined by the stretching vibrations of (-M-N)phen and (-M-N)pyrd observed in the infrared spectra.-OH peaks of characteristic B-OH bonds of heptaborate rings and sharp asymmetric and symmetric stretching vibrations were detected confirming the presence of trigonal borate molecule in the rings. Due to the similar thermal decomposition properties of the molecules, it was determined that the hydrated waters that precipitated out of the coordination sphere in all structures moved away from the structures in a single step. As the second degradation step of heptaborate salt structures, the presence of water in amounts attributable to the removal of-OH groups in borate rings as water vapor in all structures was calculated. It has been observed that this degradation step occurs in a single step in all structures and the relevant experimental theoretical mass losses are compatible with each other. Combustion degradation of organic ligands was observed as the final degradation step of the heptaborate salt structures with metal cation complexes. While peaks belonging to heptaborate rings were observed from the recorded powder x-ray diffraction patterns, electronic transition data also supported that the metal cation complex was in octahedral geometry. © 2023, Turkish Energy Nuclear and Mining Research Institute. All rights reserved.
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    Öğe
    The Structural and Thermal Characterization of New Cu-Arginate Complex; Experimental and Simulated Hydrogen Adsorbstion Properties
    (2016) Şahin, Zarife Sibel; Öztürk, Zeynel; Yurdakul, Ömer; Köse, Dursun Ali
    The copper-arginate complex was synthesized and characterized by using FTIR, TG/DTA-DrTG, UV-Vis spectroscopy and elemental analysis methods. In addition, experimental and theoretical hydrogen storage capabilities were investigated. The unit cell of complex structure included that one mole CuII as centered cation and one mole of free NaI cation and one mole of NaSO4- as coordinated to arginine ligand and two moles of arginate ligands and one mole of aqua ligand as coordinated to NaSO4-. The CuII cation had square-pyramidal coordination sphere and the Na1 metal cation had trigonal coordination scheme. The other sodium metal cation (Na2) was implemented in the released position as counter ion of NaSO4-. It was found that the arginine complex, synthesized in this work have 0.533 m2/g BET surface area and 6.92E-3 wt. % hydrogen storage capacity at 77 K and 1 bar while simulated value was 3.27E-3 wt. % for the same conditions.