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Structure of salts of lithium chloride and lithium hexafluorophosphate as solvates with pyridine and vinylpyridine and structural comparisons: (C 5 H 5 N)LiPF 6 , [ p -(CH 2 =CH)C 5 H 4 N]LiPF 6 , [(C 5 H 5 N)LiCl] n , and [ p -(CH 2 =CH)C 5 H 4 N] 2 Li(μ-Cl) 2 Li[ p -(CH 2 =CH)C 5 H 4 N] 2

Jalil, AbdelAziz ; Clymer, Rebecca N. ; Hamilton, Clifton R. ; [weitere]

International Union of Crystallography (IUCr) ; 2017

In: Acta Crystallographica Section C Structural Chemistry Vol. 73, No. 3 ( 2017-03-01), p. 264-269

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In: Acta Crystallographica Section C Structural Chemistry, International Union of Crystallography (IUCr), Vol. 73, No. 3 ( 2017-03-01), p. 264-269

Kurzfassung: Due to the flammability of liquid electrolytes used in lithium ion batteries, solid lithium ion conductors are of interest to reduce danger and increase safety. The two dominating general classes of electrolytes under exploration as alternatives are ceramic and polymer electrolytes. Our group has been exploring the preparation of molecular solvates of lithium salts as alternatives. Dissolution of LiCl or LiPF 6 in pyridine (py) or vinylpyridine (VnPy) and slow vapor diffusion with diethyl ether gives solvates of the lithium salts coordinated by pyridine ligands. For LiPF 6 , the solvates formed in pyridine and vinylpyridine, namely tetrakis(pyridine-κ N )lithium(I) hexafluorophosphate, [Li(C 5 H 5 N) 4 ]PF 6 , and tetrakis(4-ethenylpyridine-κ N )lithium(I) hexafluorophosphate, [Li(C 7 H 7 N) 4 ]PF 6 , exhibit analogous structures involving tetracoordinated lithium ions with neighboring PF 6 − anions in the I \overline{4} and Aea 2 space groups, respectively. For LiCl solvates, two very different structures form. catena -Poly[[(pyridine-κ N )lithium]-μ 3 -chlorido], [LiCl(C 5 H 5 N)] n , crystalizes in the P 2 1 2 1 2 1 space group and contains channels of edge-fused LiCl rhombs templated by rows of π-stacked pyridine ligands, while the structure of the LiCl–VnPy solvate, namely di-μ-chlorido-bis[bis(4-ethenylpyridine-κ N )lithium], [Li 2 Cl 2 (C 7 H 7 N) 4 ], is described in the P 2 1 / n space group as dinuclear (VnPy) 2 Li(μ-Cl) 2 Li(VnPy) 2 units packed with neighbors via a dense array of π–π interactions.

Materialart: Online-Ressource

ISSN: 2053-2296

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