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The asymmetric unit of the title compound, [Tm 2 (C 7 H 6 NO 2 ) 6 (H 2 O) 4 ]·2H 2 O, contains three 4-aminobenzoate ( 4ABA ) ligands, two coordinated water molecules, a thulium metal ion, and a water molecule of crystallization. The overall structure of the complex ( 4ABA-Tm ) is in the form of a dimer. In the dinuclear thulium complex, symmetry-relevant TmO 8  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. 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 interactions. Further stabilization of the crystal packing is due to C—H...π and off-set π–π stacking interactions. 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.

acta crystallographica. section e, crystallographic communications

Synthesis, crystal structure, Hirshfeld surface and void analysis of bis(μ2-4-aminobenzoato-κ2 O:O′)bis[bis(4-aminobenzoato-κ2 O,O′)diaquathulium(III)] dihydrate