title: 1,4-Diferrocenyl-2-methyl-piperazine-1,4-diium bis-(trifluoro-acetate).
abstract: In the title compound, [Fe(2)(C(5)H(5))(2)(C(17)H(24)N(2))](CF(3)COO)(2), the cation possesses a crystallographically imposed inversion centre. The methyl group is disordered over two positions of equal occupancy. The Fe-C bond lengths to the two cyclo-penta-diene rings vary from 2.025 (6) to 2.044 (6) Å. Inter-molecular N-H⋯O and C-H⋯O hydrogen bonds link the cations and anions into a three-dimensional network.
authors.affiliation: Ordered Matter Science Research Center, College of Chemistry and Chemical Engineering, Southeast University, Nanjing 210096, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: Chen