Cs[Tf2N]: a second polymorph with a layered structure

Acta Crystallographica Section E: Crystallographic Communications

Stritzinger, J.T.¹ 

[1] Materials Physics and Applications Division, Associate Directorate for Experimental Physical Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

关键词: CRYSTAL STRUCTURE;    IONIC LIQUID;    BISTRIFLIMIDE;    LAYERED STRUCTURE;   

DOI  :  10.1107/S2056989018004401

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The structural determination of the ionic liquid, caesium bis­[(tri­fluoro­meth­yl)sulfon­yl]imide or poly[[μ4-bis­[(tri­fluoro­meth­yl)sulfon­yl]imido]caesium(I)], Cs[N(SO2CF3)2] or Cs[Tf2N], reveals a second polymorph that also crystallizes in a layer structure possessing monoclinic P21/c symmetry at 120 K instead of C2/c for the known polymorph [Xue et al. (2002). Solid State Sci. 4, 1535–1545]. The caesium ions in the cationic layers are coordinated by the sulfonyl groups of the bis­triflimide mol­ecules from anion layers while the tri­fluoro­methyl groups are oriented in the opposite direction, forming a non-polar surface separating the layers. The layer direction is (100).

【 授权许可】

CC BY