{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["71(Pt 11)"],"submitter":["Gomathi J"],"pubmed_abstract":["The title mol-ecular salt, C6H8N(+)·C6H2N3O7 (-) (systematic name: 2-methyl-pyridinium 2,4,6-tri-nitro-phenolate), crystallizes with two cations and two anions in the asymmetric unit. In the crystal, the cations are linked to the anions via bifurcated N-H⋯(O,O) hydrogen bonds, generating R 1 (2)(6) graph-set motifs. Numerous C-H⋯O hydrogen bonds are observed between these cation-anion pairs, which result in a three-dimensional network. In addition, weak aromatic π-π stacking between the 2-methyl-pyridinium rings [inter-centroid distance = 3.8334 (19) Å] and very weak stacking [inter-centroid distance = 4.0281 (16) Å] between inversion-related pairs of picrate anions is observed. The title salt is a second triclinic polymorph of the structure (also with Z' = 2) reported earlier [Anita et al. (2006). Acta Cryst. C62, o567-o570; Chan et al. (2014 ▸). CrystEngComm, 16, 4508-4538]. In the title compound, the cations and anions display a chequerboard arrangement when viewed down [100], whereas in the first polymorph, (010) layers of alternating cations and anions are apparent in a [100] view. It is inter-esting that the unit-cell lengths are almost identical for the two polymorphs, although the inter-axial angles are quite different."],"journal":["Acta crystallographica. Section E, Crystallographic communications"],"pagination":["o848-9"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC4645006"],"repository":["biostudies-literature"],"pubmed_title":["Crystal structure of a second triclinic polymorph of 2-methyl-pyridinium picrate."],"pmcid":["PMC4645006"],"pubmed_authors":["Kalaivani D","Gomathi J"],"additional_accession":[]},"is_claimable":false,"name":"Crystal structure of a second triclinic polymorph of 2-methyl-pyridinium picrate.","description":"The title mol-ecular salt, C6H8N(+)·C6H2N3O7 (-) (systematic name: 2-methyl-pyridinium 2,4,6-tri-nitro-phenolate), crystallizes with two cations and two anions in the asymmetric unit. In the crystal, the cations are linked to the anions via bifurcated N-H⋯(O,O) hydrogen bonds, generating R 1 (2)(6) graph-set motifs. Numerous C-H⋯O hydrogen bonds are observed between these cation-anion pairs, which result in a three-dimensional network. In addition, weak aromatic π-π stacking between the 2-methyl-pyridinium rings [inter-centroid distance = 3.8334 (19) Å] and very weak stacking [inter-centroid distance = 4.0281 (16) Å] between inversion-related pairs of picrate anions is observed. The title salt is a second triclinic polymorph of the structure (also with Z' = 2) reported earlier [Anita et al. (2006). Acta Cryst. C62, o567-o570; Chan et al. (2014 ▸). CrystEngComm, 16, 4508-4538]. In the title compound, the cations and anions display a chequerboard arrangement when viewed down [100], whereas in the first polymorph, (010) layers of alternating cations and anions are apparent in a [100] view. It is inter-esting that the unit-cell lengths are almost identical for the two polymorphs, although the inter-axial angles are quite different.","dates":{"release":"2015-01-01T00:00:00Z","publication":"2015 Nov","modification":"2025-04-18T23:09:34.985Z","creation":"2019-03-27T02:01:57Z"},"accession":"S-EPMC4645006","cross_references":{"pubmed":["26594559"],"doi":["10.1107/S205698901501912X"]}}