Two<i>N</i>,<i>N</i>-dimethylbiguanidium salts displaying double hydrogen bonds to the counter-ions
作者:Li-Ping Lu、Hong-Mei Zhang、Si-Si Feng、Miao-Li Zhu
DOI:10.1107/s010827010401786x
日期:2004.10.15
The crystal structures of N,N-dimethylbiguanidium oxalate monohydrate, C4H13N52+.C2O42-.H2O, (I), and N, N-dimethylbiguanidium sulfate monohydrate, C4H13N52+.SO42-.H2O, (II), show that both compounds contain the same N, N-dimethylbiguanidium dication. In ( I), two independent oxalate ions lie about inversion centres. Strong double hydrogen bonds, with D...A distances of 2.658 (2) and 2.830 (3) Angstrom in (I), and 2.722 (3) and 2.815 (3) Angstrom in (II), are present between N atoms of the N,N-dimethylbiguanidium moieties and either the carboxylate group of the oxalate anion or the sulfate anion.