title: Crystal structure of bis-{2-[amino(iminium-yl)meth-yl]-1,1-di-methyl-guanidine} carbonate methanol disolvate.
abstract: In the title solvated mol-ecular salt, 2C4H12N5 (+)·CO3 (2-)·2CH3OH, the complete carbonate ion is generated by crystallographic twofold symmetry, with the C atom and one O atom lying on the rotation axis. The cation is twisted about the central C-N bond [C-N-C-N = -137.7 (6)°]. In the crystal, the components are linked by N-H⋯O, N-H⋯N and O-H⋯O hydrogen bonds, generating a three-dimensional supra-molecular network.
authors.affiliation: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, People's Republic of China.
authors.forename: Jinlong
authors.initials: J
authors.lastname: Dong
authors.affiliation: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, People's Republic of China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liu
authors.affiliation: Institute of Molecular Science, Key Laboratory of Chemical Biology of Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, People's Republic of China.
authors.forename: Binsheng
authors.initials: B
authors.lastname: Yang
keywords: crystal structure; hydrogen bonding; metformin; sodium carbonate