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Crystal structure at 100 K of bis-[1,2-bis-(di-phenyl-phosphan-yl)ethane]-nickel(II) bis-(tri-fluoro-methane-sulfonate): a possible negative thermal expansion mol-ecular material.

ABSTRACT: In the title salt, [Ni(C₂₆H₂₄P₂)₂](CF₃SO₃)₂ or [Ni(dppe)₂]²⁺·(OTf^-)₂ [dppe = 1,2-bis-(di-phenyl-phosphan-yl)ethane and OTf^- = tri-fluoro-methane-sulfonate], the Ni atom (site symmetry ) 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.

SUBMITTER: Cano-Benitez CA

PROVIDER: S-EPMC6218916 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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Crystal structure at 100 K of bis-[1,2-bis-(di-phenyl-phosphan-yl)ethane]-nickel(II) bis-(tri-fluoro-methane-sulfonate): a possible negative thermal expansion mol-ecular material.

Cano-Benítez Cristian A CA Metta-Magaña Alejandro J AJ Duarte-Ruiz Álvaro Á

Acta crystallographica. Section E, Crystallographic communications 20181031 Pt 11

In the title salt, [Ni(C26H24P2)2](CF3SO3)2 or [Ni(dppe)2]2+·(OTf-)2 [dppe = 1,2-bis-(di-phenyl-phosphan-yl)ethane and OTf- = tri-fluoro-methane-sulfonate], the Ni atom (site symmetry ) 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 coor ...[more]

PMID: 30443405

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