Synthesis and characterization of transition metal complex cationed heptaborate structures
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Date
2023
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Turkish Energy Nuclear and Mining Research Institute
Access Rights
info:eu-repo/semantics/openAccess
Abstract
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.
Description
Keywords
Borates, Borates with metal cations, Boron chemistry, Cyclic borates, Heptaborate
Journal or Series
Journal of Boron
WoS Q Value
Scopus Q Value
Q3
Volume
8
Issue
3
