Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 24, Pages 12055-12061Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp060924u
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- Engineering and Physical Sciences Research Council [EP/D029538/1] Funding Source: researchfish
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Neutron diffraction has been used to determine the liquid structure of 1,3-dimethylimidazolium bis{( trifluoromethyl) sulfonyl} amide ([dmim][NTf2]). Significantly smaller charge ordering is found in this liquid compared with analogous chloride and hexafluorophosphate salts due to the diffuse charge density and size of the [NTf2](-) anion. This is manifested in a much larger cation-cation and cation-anion separation and an overlap of the cation-cation and cation-anion shells. Comparison of the liquid structure with the crystal structure reported by Holbrey et al. ( Dalton Trans. 2004, 2267) indicates little correlation, for example, the [NTf2](-) anion adopts a trans orientation predominantly in the liquid whereas a cis orientation is found in the solid phase.
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