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In the title salt, C15H16NO4+.Br3, classical intra­molecular O—H...O hydrogen bonds are found, which results in the co-planarity of the ester substituents with the quinolinium residue [C—C—C—O torsion angle = 1.0 (10)°]. The bromine anions are placed on both sides of heterocyclic cation and form Br...N contacts of 3.674 (9) and 3.860 (9) Å, which confirms the location of positive charge on the N atom. Non-classical inter­molecular C—H...Br inter­actions stabilize the three-dimensional crystal structure. Moreover, anion...π inter­actions are noted [Br...ring centroid range = 3.367 (9)–3.697 (9) Å]. The partly saturated heterocycle is disordered over two sofa conformations with occupancies in the ratio 0.56 (2):0.44 (2).

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The mol­ecule of the title compound, C11H9NO2, is essentially planar [r.m.s. deviation of the non-H atoms = 0.056 (1) Å]. In the crystal, strong O—H...O hydrogen bonds form zigzag chains along the b axis. The mol­ecules form stacks along the a axis due to π–π inter­actions, the shortest distance between the centroids of the benzene and pyridinone rings being 3.6146 (7) Å.

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There are two independent mol­ecules in the asymmetric unit of the title compound, C13H13NO5S, in both of which the ester substituent is nearly coplanar [C—C—C—O torsion angles = 2.7 (7) and −0.8 (7)°] with the planar fragment of the bicycle due to the formation of a strong O—H...O intra­molecular hydrogen bond. The vinyl group at the ring N atom is approximately orthogonal to the heterocyclic mean plane [C—N—C—C torsion angles = 103.1 (6) and 98.2 (5)°]. The refinement was performed on a two-component, non-merohedrally twinned crystal [population ratio = 0.483 (3):0.517 (3).
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