4-[(2′-Cyanobiphenyl-4-yl)methyl]morpholin-4-ium perchlorate

In the title salt, C18H19N2O+·ClO4 −, the morpholinium ring adopts a chair conformation, while the two benzene rings make a dihedral angle of 62.65 (17)°. Intermolecular N—H⋯N hydrogen bonds and weak C—H⋯O interactions occur in the crystal structure.

In the title salt, C 18 H 19 N 2 O + ÁClO 4 À , the morpholinium ring adopts a chair conformation, while the two benzene rings make a dihedral angle of 62.65 (17) . Intermolecular N-HÁ Á ÁN hydrogen bonds and weak C-HÁ Á ÁO interactions occur in the crystal structure.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: XU5487).
The bond distances and bond angles in the title compound agree very well with the corresponding distances and angles reported for a closely related compound. In this structure, the intermolecular N-H···N and C-H···O hydrogen bonds link the cations and anions to chains ( Table 1). The dihedral angle between the benzene rings in the cation is 62.65 (17).

Experimental
To a stirred solution of 4′-(morpholinomethyl)biphenyl-2-carbonitrile (5.56 g, 0.02 mol) in 30 mL of methanol, perchloric acid (2.87 g, 0.02 mol) was added at the room temperature. The precipitate was filtered and washed with a small amount of ethanol 95%. Single crystals suitable for X-ray diffraction analysis were obtained from slow evaporation of a solution of the title compound in water at room temperature.

Refinement
The H atoms were positioned geometrically and refined using a riding model, with N-H = 0.82 and C-H = 0.93-0.96 Å, U iso (H) = 1.2U eq (C) and 1.5U eq (N).

Figure 2
The crystal packing of the title compound viewed along the a axis showing the hydrogen bondings network.  Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.