Crystal structure of morpholin-4-ium cinnamate

In the anhydrous salt formed from the reaction of morpholine with cinnamic acid, C(4)H(10)NO(+)·C(9)H(7)O(2) (−), the acid side chain in the trans-cinnamate anion is significantly rotated out of the benzene plane [C—C—C— C torsion angle = 158.54 (17)°]. In the crystal, one of the the aminium H atoms is involved in an asymmetric three-centre cation–anion N—H⋯(O,O′) R (1) (2)(4) hydrogen-bonding inter­action with the two carboxyl­ate O-atom acceptors of the anion. The second aminium-H atom forms an inter-species N—H⋯O(carboxyl­ate) hydrogen bond. The result of the hydrogen bonding is the formation of a chain structure extending along [100]. Chains are linked by C—H⋯O inter­actions, forming a supra­molecular layer parallel to (01-1).