Crystal structure at 100 K of bis­[1,2-bis­(di­phenyl­phosphan­yl)ethane]­nickel(II) bis­(tri­fluoro­methane­sulfonate): a possible negative thermal expansion mol­ecular material

Acta Crystallographica Section E: Crystallographic Communications

Cano-Bentez, C.A.¹  Metta-Magaa, A.J.² 

[1] Departamento de Qumica, Universidad Nacional de Colombia, Ciudad Universitaria, Bogot Kr 30 No 45-03, Colombia;Department of Chemistry and Biochemistry, University of Texas at El Paso, 500 W University El Paso, Texas 79968, USA

关键词: 100 K;    RT;    DPPE;    SQUARE-PLANAR GEOMETRY;    NEGATIVE THERMAL EXPANSION;    NTE;    CRYSTAL STRUCTURE;   

DOI  :  10.1107/S2056989018014846

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

In the title salt, [Ni(C26H24P2)2](CF3SO3)2 or [Ni(dppe)2]2+·(OTf−)2 [dppe = 1,2-bis­(di­phenyl­phosphan­yl)ethane and OTf− = tri­fluoro­methane­sulfonate], the Ni atom (site symmetry \overline{1}) has a square-planar geometry with the bidentate ligands chelating the metal. As a result of the steric hindrance of the phenyl rings, the counter-ions are blocked from the metal coordination sphere. The dynamic disorder of the anion existing at 296 K is reduced at 100 K and based on these two temperatures, negative thermal expansion behaviour is observed.

【 授权许可】

CC BY