title: l-Lysinium trifluoro-acetate.
abstract: Ions of the title compound, C(6)H(15)N(2)O(2) (+)·C(2)F(3)O(2) (-), a new organic nonlinear optical crystal, are linked by N-H⋯O hydrogen-bonding inter-actions. Both the amino groups of the l-lysinium cation are protonated. A three-dimensional network of hydrogen bonds is observed, forming a closed ring. Inter-molecular N-H⋯O hydrogen bonds involving l-lysinium cations and trifluoro-acetate anions link the ions into extended chains which run parallel to the [010] direction. The F atoms of the trifluoro-acetate anion are disordered over two sites with site occupancies of 0.423 (18) and 0.577 (18). The asymmetric unit consists of two cations and two anions.
authors.affiliation: State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: Zhi Hua
authors.initials: ZH
authors.lastname: Sun
authors.forename: Jian Dong
authors.initials: JD
authors.lastname: Fan
authors.forename: Guang Hui
authors.initials: GH
authors.lastname: Zhang
authors.forename: Xin Qiang
authors.initials: XQ
authors.lastname: Wang
authors.forename: Dong
authors.initials: D
authors.lastname: Xu