Guanidinium 3-carboxy-2,3-dihydroxypropanoate monohydrate

Abstract

In the title hydrated salt, CH6N3 +·C4H5O6 −·H2O, the deprotonated carboxyl group is disordered over two positions with a site-occupancy ratio of 0.945 (3):0.055 (3). The bond lengths in the guanidinium cation are inter­mediate between normal C—N and C=N bond lengths, indicating significant delocalization in this species. In the crystal structure, anions and water mol­ecules are linked into sheets parallel to the ab plane by inter­molecular O—H⋯O hydrogen bonds. The linking of the anions and water mol­ecules with the cations by inter­molecular N—H⋯O hydrogen bonds creates a three-dimensional network.

Bis(2,6-diaminopyridinium) tartrate monohydrate

“…Comparing with the unprotonated structure (De cires- Mejias et al, 2004), protonation of atoms N1 & N4 have widened the C-N-C angles to 123.51 (8) and 123.92 (9)°, respectively, for angles of C5-N1-C9 and C10-N4-C14. The bond lengths (Allen et al, 1987) and angles observed are within normal ranges and are consistent with those related structures (Al-Dajani, Abdallah et al, 2009;Al-Dajani, Salhin et al, 2009).…”

“…For related structures, see: Al-Dajani, Abdallah et al (2009); Al-Dajani, Salhin et al (2009). For hydrogen-bond motifs, see: Bernstein et al (1995).…”

Guanidinium chlorochromate

“…The C1-N1 and C1-N2 bond lengths in the propeller-shaped guanidinium cation are almost equal [1.3310 (14) and 1.3289 (8) Å respectively], indicating that the usual model of electron dislocalization in this moiety (Allen et al, 1987). The bond lengths and angles are comparable to closely related guanidinium (Al-Dajani et al, 2009) and chlorochromate (Lorenzo Luis et al, 1996) structures.…”

“…For graph-set descriptions of hydrogen-bond motifs, see: Bernstein et al (1995). For related structures, see: Al-Dajani et al (2009); Lorenzo Luis et al (1996). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).…”

Tetraguanidinium bis[citrato(3−)]cuprate(II) dihydrate

“…For general background to citric acid and guanidine, see: Raczyń ska et al (2003); Yamada et al (2009); Sigman et al (1993). For a related structure with a guanidinium cation, see: Al-Dajani et al (2009). For hydrogen-bond motifs, see: Bernstein et al (1995).…”