Abstract
Metal complexes with chelating ligands are known as promising precursors for the synthesis of targeted metal oxides via thermal decomposition pathways. Triethanolamine (TEA) is a versatile ligand possessing a variety of coordination modes to metal ions. Understanding the crystal structure is beneficial for the rational design of the metal complex precursors. Herein, a bis(triethanolamine)nickel (II) dinitrate (named as Ni-TEA) crystal was synthesized and thoroughly investigated. X-ray crystallography revealed that Ni(II) ions adopt a distorted octahedral geometry surrounded by two neutral TEA ligands via two N and four O coordinates. Hirshfeld surface analysis indicated the major contribution of the intermolecular hydrogen-bonding between —OH groups of TEA in the crystal packing. Moreover, several O–H stretching peaks in Fourier transformed infrared spectroscopy (FTIR) spectra emphasizes the various chemical environments of —OH groups due to the formation of the hydrogen-bonding framework. The Density-functional theory (DFT) calculation revealed the electronic properties of the crystal. Furthermore, the Ni-TEA complex is presumably useful for metal oxide synthesis via thermal decomposition at a moderate temperature (380 °C). Cyclic voltammetry indicated the possible oxidative reaction of the Ni-TEA complex at a lower potential than nickel(II) nitrate and TEA ligand, highlighting its promising utility for the synthesis of mixed valence oxides such as spinel structures.
Highlights
Metal complexes with chelating ligands are well-known as one of the molecular single-source precursors (SSPs) used for the synthesis of targeted metal oxides, including single-phase, stoichiometric-mixed and hetero-metal-doped metal oxides via thermal decomposition pathways. [1,2,3]Controlled incorporation of the targeted metals into the metal complexes provides a way to define the stoichiometry at the molecular level and to precisely control the distribution of targeted metals in the material matrix [4,5,6]
The complete titled molecule consists of a nickel(II) ion datively-bonded with two tridentate TEA ligands in the inner coordination sphere and two nitrate anions in the outer coordination sphere
This work reported the successful synthesis of bis(triethanolamine)nickel(II) dinitrate complex thorough investigation of its crystal structure and characteristic features
Summary
Metal complexes with chelating ligands are well-known as one of the molecular single-source precursors (SSPs) used for the synthesis of targeted metal oxides, including single-phase, stoichiometric-mixed and hetero-metal-doped metal oxides via thermal decomposition pathways. [1,2,3]Controlled incorporation of the targeted metals into the metal complexes provides a way to define the stoichiometry at the molecular level and to precisely control the distribution of targeted metals in the material matrix [4,5,6]. Metal complexes with chelating ligands are well-known as one of the molecular single-source precursors (SSPs) used for the synthesis of targeted metal oxides, including single-phase, stoichiometric-mixed and hetero-metal-doped metal oxides via thermal decomposition pathways. A variety of TEA-chelating complex structures is observed depending on the central metal ions and the synthetic parameters [9,10,11,12,13,14,15,16,17,18,19,20,21,22,23]. In cases of the tridentate (κ3-N,O,O0 ) coordination, a metal ion generally coordinates with two tridentate TEA ligands to form the 6-coordinated metal complexes [16,17,18,19,20,21,22]. The mixed tridentate and tetradentate TEA ligands are observed exhibiting the
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