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Tb2Ni2Mg3 is a new structure type, derived from Ru3Al2B2, which can be viewed as the first representative of a homologous linear structure series based on the [alpha]-Fe, CsCl and AlB2 structure types. The Tb atoms in the structure are enclosed in 17-vertex polyhedra, while rhombododeca­hedra and distorted rhombododeca­hedra surround the Mg atoms, and equatorially tricapped trigonal prisms form around the Ni atoms.

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The asymmetric unit of the title compound, C10H8O2, contains two planar symmetry-independent mol­ecules linked by an O—H...O hydrogen bond. In the crystal structure, mol­ecules are linked into infinite chains of rings, formed by a combination of O—H...O and C—H...O hydrogen bonds, and additionally reinforced by π–π stacking inter­actions. Adjacent chains are connected by weak C—H...π inter­actions.

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The asymmetric unit of the title compound, C10H8O2, contains two practically planar symmetry-independent mol­ecules linked by one O-H...O hydrogen bond. Mol­ecules are further linked into a three-dimensional network, which is built from R66(36), R66(18), R66(30) and R44(26) rings formed by the combined effect of three O-H...O and one C-H...O hydrogen bond. This network is additionally stabilized by an O-H...[pi] inter­action.
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