Abstract
The asymmetric unit of the title compound, [Tm2(C7H6NO2)6(H2O)4]·2H2O, contains three 4-amino-benzoate (4ABA) ligands, two coordinated water mol-ecules, a thulium metal ion, and a water mol-ecule of crystallization. The overall structure of the complex (4ABA-Tm) is in the form of a dimer. In the dinuclear thulium complex, symmetry-relevant TmO8 coordination polyhedra are formed by the O atoms of two chelating 4-amino-benzoate ligands, the O atoms of two non-chelating 4-amino-benzoate ligands, and two water mol-ecules. The Tm-O bond lengths range from 2.216 (3) to 2.471 (3) Å with the Tm⋯Tm separation in the dinuclear complex being 4.7863 (5) Å. The crystal structure features O-H⋯N, N-H⋯O, and O-H⋯O hydrogen-bonding inter-actions. Further stabilization of the crystal packing is due to C-H⋯π and off-set π-π stacking inter-actions. Hirshfeld surface analysis indicates that H⋯H contacts are the most significant contributors to the crystal packing (45.9%). In addition, a void analysis was performed to check the strength of the crystal packing.
Highlights
The asymmetric unit of the title compound, [Tm2(C7H6NO2)6(H2O)4]Á2H2O, contains three 4-aminobenzoate (4ABA) ligands, two coordinated water molecules, a thulium metal ion, and a water molecule of crystallization
In the dinuclear thulium complex, symmetry-relevant TmO8 coordination polyhedra are formed by the O atoms of two chelating 4-aminobenzoate ligands, the O atoms of two non-chelating 4-aminobenzoate ligands, and two water molecules
Sm+3 (Khiyalov et al, 1981; Mao & Lianq, 2016), only the nitrogen atom of the amino group is coordinated by the central metal atom, while in complexes of Lu+3 and Ho+3 with HL (Sun et al, 2004), the nitrogen atom of the amino group is not coordinated while the ligands are attached to the metal atom by the oxygen atoms of the carboxylate moiety
Summary
The coordination chemistry of rare-earth metals has been widely studied, and the structures of a significant variety of complexes with diverse kinds of ligands have been reported (You et al, 2021). Sm+3 (Khiyalov et al, 1981; Mao & Lianq, 2016), only the nitrogen atom of the amino group is coordinated by the central metal atom, while in complexes of Lu+3 and Ho+3 with HL (Sun et al, 2004), the nitrogen atom of the amino group is not coordinated while the ligands are attached to the metal atom by the oxygen atoms of the carboxylate moiety In this context, we report the synthesis, crystal structure, Hirshfeld surface, void, thermogravimetric and FT–IR analysis of the title compound, [Tm2(C7H6NO2)6(H2O)4]Á2H2O, which is closely related to its Lu+3 and Ho+3 analogues (Sun et al, 2004).
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