(3S,4S)-3-Ethyl-4-hydr-oxy-3-(3-methoxy-phen-yl)-1-methyl-azepan-1-ium d-tartrate dihydrate

Bis(2,9-dimethyl-1,10-phenanthrolin-1-ium) hydrogen (S,S)-tartrate nona-hydrate

The asymmetric unit of the title compound, 2C(14)H(13)N(2) (+)·2C(4)H(5)O(6) (-)·9H(2)O, contains two cations and two anions in addition to nine mol-ecules of water. Each of the hydrogen tartrate anions is hydrogen bonded to itself by translation along [100] in a head-to-tail fashion via a short hydrogen bond with donor-acceptor distances of 2.473 (4) and 2.496 (4) Å. A large number of inter-molecular O-H⋯O, N-H⋯O and C-H⋯O hydrogen-bonding inter-actions, as well as π-π stacking [centroid-centroid distances in the range 3.642 (3) to 3.866 (3) Å], play an important role in the crystal structure.

(3S,4R)-3-Ethyl-4-hydroxy-3-(3-methoxyphenyl)-1-methylazepanium (2R,3R)-2,3-bis(benzoyloxy)-3-carboxypropionate

The crystal structure of the title compound, C₁₆H₂₆NO₂⁺·C₁₈H₁₃O₈⁻, is stabilized by an extensive network of classical N—H⋯O and O—H⋯O hydrogen bonding. The crystal structure also shows an ammonium-driven diastereo­isomerism.

1,10-Phenanthrolin-1-ium hydrogen (S,S)-tartrate trihydrate and a correction

The title structure, C₁₂H₉N₂⁺·C₄H₅O₆⁻·3H₂O, shows that one of the protons of d-tartaric acid has been transferred to 1,10-phenanthroline. The d-hydrogen tartrate anions are joined together in a head-to-tail fashion via a short hydrogen bond with donor–acceptor distance of 2.4554 (12) Å, unsymmetrical O—H distances of 1.01 (4) Å and 1.45 (4) Å, and a 174 (4)° O—H—O bond angle. The phenanthrolinium rings are π-stacked with an average separation of 3.58 (11) Å. The structural report corrects a previous report in the literature [Wang et al. (2006 ▶). Acta Cryst. E62, o2508–o2509] of the isostructural l-hydrogen tartrate enanti­omer in which the proton transfer and short hydrogen bond were missed.