Abstract
In the title lanthanide(III) compound, [Tb(NO3)2(C2H6N2O)3]NO3, the asym-metric unit contains one Tb3+ ion, three acetohydrazide (C2H6N2O) ligands, two coordinated nitrate anions, and an isolated nitrate anion. The Tb3+ ion is in a ninefold coordinated distorted tricapped trigonal-prismatic geometry formed by three oxygen atoms and three nitro-gen atoms from three different acetohydrazide ligands and three oxygen atoms from two nitrate anions. In the crystal, the complex mol-ecules and the non-coordinated nitrate anions are assembled into a three-dimensional supra-molecular architecture through extensive N-H⋯O hydrogen-bonding inter-actions between the amine NH groups of the acetohydrazide ligands and the nitrate oxygen atoms. Hirshfeld surface analysis was performed to aid in the visualization of inter-mol-ecular contacts.
Highlights
We present the molecular structure of a new terbium(III) complex, [Tb(C2H6N2O)3(NO3)2]NO3 (1), synthesized with acetohydrazide (C2H6N2O) as the organic ligand
Extensive hydrogen-bonding interactions involving the three components of the hydrazide group of the acetohydrazide ligand and the coordinated and non-coordinated nitrate ions contribute to the stabilization of the supramolecular structure of 1 (Table 1; the N—H distances are all fixed with N—H = 0.86 Æ 0.02 A )
The dimers are further held together through an intermolecular N3— H3AÁ Á ÁO9 hydrogen bond between the amine NH and the coordinated nitrate oxygen (O9), resulting in the formation of a two-dimensional supramolecular layer that propagates in the [100] direction, Fig. 4
Summary
Over the past two decades, there has been increasing interest in the construction of new lanthanide-based coordination compounds, because of their structural diversity and because of their fascinating potential applications in luminescence, magnetism, adsorption, and similar areas (Roy et al, 2014; Cui et al, 2018; Kuwamura et al, 2021). It is well known that lanthanide(III) ions have a high affinity for and prefer binding to hard donor atoms. 15 lanthanide coordination complexes have recently been reported by our groups. Some of these complexes exhibited a high CO2 uptake ability at high pressure (Theppitak et al, 2021a), and have shown great potential as luminescent sensors for acetone and the Co2+ ion with good recyclability (Theppitak et al, 2021b). We present the molecular structure of a new terbium(III) complex, [Tb(C2H6N2O)3(NO3)2]NO3 (1), synthesized with acetohydrazide (C2H6N2O) as the organic ligand. A Hirshfeld surface analysis and twodimensional fingerprint plots were used to quantify the intermolecular contacts in the crystal structure
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