title: A new tetrathiafulvalene-diamide cation salt with [Cu2Br4]2- anions.
abstract: The title salt, bis[2,3-bis(aminocarbonyl)-8,9-bis(methylsulfanyl)tetrathiafulvalenium] di-mu-bromido-bis[bromidocopper(II)], (C(10)H(10)N(2)O(2)S(6))(2)[Cu(2)Br(4)], contains 2,3-bis(aminocarbonyl)-8,9-bis(methylsulfanyl)tetrathiafulvalenium radical cations, [DMT-TTF(CONH(2))(2)](.+), and [Cu(2)Br(4)](2-) anions. The cations are associated across centres of inversion in a head-to-tail fashion via short face-to-face S...S stacking (TTF moiety). These dimers are further assembled into a one-dimensional chain structure via interdimer double S...S contacts involving the methylsulfanyl groups. The one-dimensional chains give rise to a two-dimensional structure through intermolecular double N-H...O hydrogen bonds involving the amide group. The [Cu(2)Br(4)](2-) anions, which straddle centres of inversion, are located between the cation layers. Electron paramagnetic resonance measurements show a radical signal, indicating that the two TTF(.+) radicals are not completely coupled in the dimer.
authors.affiliation: Department of Chemistry, Suzhou University, Suzhou 215123, People's Republic of China.
authors.forename: Wen
authors.initials: W
authors.lastname: Lu
authors.forename: Qin Yu
authors.initials: QY
authors.lastname: Zhu
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xiao Min
authors.initials: XM
authors.lastname: Lin
authors.forename: Jie
authors.initials: J
authors.lastname: Dai