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• W3155618891 abstract "Two polymorphs of the title tetrakis-substituted pyrazine carboxylic acid, 3,3′,3′′,3′′′-{[pyrazine-2,3,5,6-tetrayltetrakis(methylene))tetrakis(sulfanediyl]}tetrapropionic acid, C 20 H 28 N 2 O 8 S 4 , ( H 4 L1 ), have been obtained, H 4 L1_A and H 4 L1_B . Each structure crystallized with half a molecule in the asymmetric unit of a triclinic P overline{1} unit cell. The whole molecules are generated by inversion symmetry, with the pyrazine rings being located about inversion centers. The crystals of H 4 L1_B were of poor quality, but the X-ray diffraction analysis does show the change in conformation of the –CH 2 —S—CH 2 —CH 2 – side chains compared to those in polymorph H 4 L1_A . In the crystal of H 4 L1_A , molecules are linked by two pairs of O—H...O hydrogen bonds, enclosing R 2 2 (8) ring motifs forming layers parallel to plane (100), which are linked by C—H...O hydrogen bonds to form a supramolecular framework. In the crystal of H 4 L1_B , molecules are also linked by two pairs of O—H...O hydrogen bonds enclosing R 2 2 (8) ring motifs, however here, chains are formed propagating in the [001] direction and stacking up the a -axis. Reaction of H 4 L1 with Hg(NO 3 ) 2 in the presence of a potassium acetate buffer did not produce the expected binuclear complex, instead crystals of a potassium–organic framework were obtained, poly[(μ-3-{[(3,5,6-tris{[(2-carboxyethyl)sulfanyl]methyl}pyrazin-2-yl)methyl]sulfanyl}propanoato)potassium], [K(C 20 H 27 N 2 O 8 S 4 )] n ( KH 3 L1 ). The organic mono-anion possesses inversion symmetry with the pyrazine ring being located about an inversion center. A carboxy H atom is disordered by symmetry and the charge is compensated for by a potassium ion. A similar reaction with Zn(NO 3 ) 2 resulted in the formation of crystals of a dipotassium-organic framework, poly[(μ-3,3′-{[(3,6-bis{[(2-carboxyethyl)sulfanyl]methyl}pyrazine-2,5-diyl)bis(methylene)]bis(sulfanediyl)}dipropionato)dipotassium], [K 2 (C 20 H 26 N 2 O 8 S 4 )] n ( K 2 H 2 L1 ). Here, the organic di-anion possesses inversion symmetry with the pyrazine ring being located about an inversion center. Two symmetry-related acid groups are deprotonated and the charges are compensated for by two potassium ions." @default.
• W3155618891 created "2021-04-26" @default.
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• W3155618891 date "2021-04-09" @default.
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• W3155618891 title "A new tetrakis-substituted pyrazine carboxylic acid, 3,3′,3′′,3′′′-{[pyrazine-2,3,5,6-tetrayltetrakis(methylene)]tetrakis(sulfanediyl)}tetrapropionic acid: crystal structures of two triclinic polymorphs and of two potassium–organic frameworks" @default.
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• W3155618891 doi "https://doi.org/10.1107/s2056989021003479" @default.
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