title: Bis(4-carbamoylpiperidinium) biphenyl-4,4'-disulfonate.
abstract: In the title isonipecotamide salt 2C(6)H(13)N(2)O(+)·C(12)H(8)O(6)S(2) (2-), the asymmetric unit comprises one biphenyl-4,4'-disulfonate dianion which lies across a crystallographic inversion centre and another in a general position [dihedral angle between the two phenyl rings is 37.1 (1)°], together with three isonipecotamide cations. Two of these cations give a cyclic homomeric amide-amide dimer inter-action [graph set R(2) (2)(8)], the other giving a similar dimeric inter-action but across an inversion centre, both dimers then forming lateral cyclic R(4) (2)(8) pyrimidinium-amide N-H⋯O inter-actions. These units are linked both laterally and longitudinally to the sulfonate groups of the dianions through piperidinium N-H⋯O hydrogen bonds, giving a three-dimensional framework structure.
authors: Graham
authors: G
authors: Smith
authors: Urs D
authors: UD
authors: Wermuth
authors: David J
authors: DJ
authors: Young
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