Anion-specific ionic liquid orientational analysis

Anion-Specific Ionic Liquid Orientational Analysis 

Some deviation from the expected behavior was observed with the terminal methyl groups of the butyl chain of [BMIM][PFg] with a tilt angle of 54 and the terminal methyl from the butyl chain of [BMIM][Br] with a tilt of about 47 relative 

C=N stretching modes (2000-2300 wave number range) of the [DCA] anion in ssp and ppp modes versus small signals in the other two configurations indicated less ordering of the anion on the surface [28]. 

The aromatic ring is oriented along the surface plane, indicated by the absence of the H-C(4)-C(5)-H stretching modes [28] with alkyl chains to a more or lesser extent protmding toward the gas phase. The anion does not affect the cation orientation, but anion and the cation alkyl chain interact with each other and tilt in a way that results in the minimization of surface energy the measured tilt angles of the alkyl chains relative to the surface normal were about 52° away from the surface normal with the butyl chain projecting toward the gas phase [28]. 

A detailed PNA analysis of the symmetric stretching mode of the methyl functional group on the butyl chain of the cation and the methyl group from the methyl sulfate anion signal intensity determined minima at 2° 3° for the methyl 

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Anion-Specific Ionic Liquid Orientational Analysis... 

The combination of cation and anion can be varied and tailored to specific chemical requirements, which makes them attractive for many chemical and industrial appHcations. The mechanisms of ionic liquid-surface interactions have been investigated by analysis of cation and anion orientation and its impact on the overall ionic Hquid behavior using surface-sensitive spectroscopic techniques [1, 7, 10, 11],... 

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