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The asymmetric unit of the title compound, 2C 12 H 8 N 2 ·C 8 H 10 O 8 ·2H 2 O, contains one 1,10-phenanthroline mol­ecule, one half-mol­ecule of butane-1,2,3,4-tetra­carb­oxy­lic acid (H 4 BTC) and a water mol­ecule, with the complete tetra-acid generated by crystallographic inversion symmetry. Inter­molecular O—H⋯O hydrogen bonds and π–π stacking inter­actions [centroid–centroid distances = 3.672 (2) and 3.708 (2) Å form an extensive three-dimensional network, which consolidates the crystal packing.

Butane-1,2,3,4-tetracarboxylic acid–1,10-phenanthroline–water (1/2/2)