Novel urea/thiourea-betaine inclusion compounds consolidated by host-guest hydrogen bonds

Abstract

Two new inclusion compounds, (CH₃)₃N⁺CH₂ COO⁻·2(NH₂)₂CS (1) and (CH₃)₃N⁺ CH₂COO⁻·2(NH₂)₂CO (2), have been prepared and characterized by X-ray crystallography. In the crystal structure of 1, the cationic moieties are trapped in the channel-like lattice with quasi-rectangular section constructed from the linkage of the carboxyl anionic moieties and thiourea ribbons formed by the centrosymmetric hydrogen-bonded thiourea dimers. In the honeycomb-like stereo host lattice of two that are built by urea molecules, each channel is parallel to the b axis, and every two cationic moieties lie in the same column but link different ribbons with host-guest hydrogen bonds.

Keywords:

• Betaine
• hydrogen bonds
• inclusion compounds
• thiourea
• urea

Additional information

Funding

This work was supported by Science Technology Foundation of Guizhou (No. [2014] 7055).