4-Carb­oxy­piperidinium 1-carb­oxy­cyclo­butane-1-carboxyl­ate

Belandria, L.M.; Mora, A.J.; Delgado, G.E.; Briceño, A.

doi:10.1107/S0108270111054977

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 3
(a) A homomeric CBDC chain, linked by O4—H4⋯O5^iv hydrogen bonds, with the graph-set symbol C(6), displaying the cyclobutane rings oriented towards the same side of the chain. (b) The double head-to-tail structure, graph-set symbol R₄²(18), formed by two ISO⁺ cations and two CBDC⁻ anions. It is similar to that observed in (c) cis-4-ammoniocyclohexanecarboxylate hemihydrate (Ávila et al., 2004

). Owing to the flexibility of the pendant ⁺NH₃ group, direct interaction of the amino acid molecules is allowed, while in ISO⁺·CBDC⁻, the amino acid requires two bridging CBDC⁻ anions to form the R₄²(18) ring. [Symmetry codes: (i) x + 1, y, z; (iii) −x, −y + 1, −z + 1; (iv) x, −y + $[{1\over 2}]$ , z − $[{1\over 2}]$ ; (v) −x + 1, −y + 1, −z + 1; (vi) −x + $[{1\over 2}]$ , −y + $[{1\over 2}]$ , −z + 2.]

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 68| Part 2| January 2012| Pages o88-o91

doi:10.1107/S0108270111054977

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