Key indicatorsSingle-crystal X-ray study T = 100 K Mean (C-C) = 0.003 Å R factor = 0.036 wR factor = 0.094 Data-to-parameter ratio = 17.3For details of how these key indicators were automatically derived from the article, see

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The title compound, [Zn(C7H3NO4)(C12H8N2)(H2O)]·H2O, is isostructural with the manganese(II) analogue. The Zn atom is coordinated by a tridentate dipicolinate dianion, a bidentate 1,10‐phenanthroline mol­ecule and a water mol­ecule, resulting in a substanti­ally distorted ZnO3N3 octa­hedral grouping. The crystal packing is consolidated by O—H⋯O hydrogen bonds and probable π–π stacking.

Key indicators: single-crystal X-ray study; T = 120 K; mean (C-C) = 0.015 Å; R factor = 0.096; wR factor = 0.149; data-to-parameter ratio = 17.2.The title compound, C 6 H 13 N 2 + ÁC 20 H 7 Br 4 O 5 À , is a molecular salt of singly protonated 1,4-diazabicyclo[2.2.2]octane and the eosinide monoanion. Contrary to a handful of previous crystal structures which contain eosin in its dianionic form, here, the carboxyl group of the anion has retained its H atom. The dihedral angle between the triple ring system and the pendant benzene ring in the anion is 86.0 (2) . In the crystal structure, the components interact by way of a bifurcated N-HÁ Á Á(O,Br) hydrogen bond linking cation and anion, and an O-HÁ Á ÁO hydrogen bond which links the anions into infinite chains propagating in [001].

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