Solid, liquid and structural organization
of imidazolium ionic liquids 6



Structural organization in the solid phase
Structural organization in liquid and gas phase
Structural organization in solution
STRUCTURES
STATISTICS

1,3-dialkyl imidazolium salts are one of the most popular and investigated classes of room temperature ionic liquids. Figures&figures
Much of the focus on imidazolium salts is due to the utility that early research demonstrated them to possess – a case of success begetting success. As a matter of fact dialkylimidazolium cations associated with relatively weak coordinating anions are compounds with unique physical-chemical properties, that can, in principle, be finely tuned by varying the N-alkylimidazolium substituents and/or the anion. These materials are very popular and enjoy a plethora of applications in various domains of physical sciences.
Perhaps more significantly, the use of imidazolium salts – especially the “water stable” varieties – is easy. These members of the ionic liquid family are readily prepared, and are now becoming commercially available.

Structural organization

Although in various cases the physical-chemical properties and/or the outcome of the processes in these liquids significantly differ from those performed in “classical” dipolar organic solvents, they are still (2004) regarded as merely homogeneous solvents. Nevertheless, recent studies have proved that indeed pure 1,3-dialkylimidazolium ionic liquids are better described as hydrogen-bonded polymeric supramolecules of the type {[(DAI)x(X)x-n]n+[(DAI)x-n(X)x)]n-}n where DAI is the 1,3-dialkylimidazolium cation and X the anion. This structural pattern is a general trend for the solid phase and is maintained to a great extent in the liquid phase and even in the gas phase. The introduction of other molecules and macromolecules occurs with a disruption of the hydrogen bond network and in some cases can generate nano-structures with polar and non-polar regions where inclusion-type compounds can be formed.
Long-chain IL salts have attracted some interest due to their liquid crystalline (LC) properties.

So, let's have a look at the imidazolium ionic liquids structure in details...

Structural organization in the solid phase
Structural organization in liquid and gas phase
Structural organization in solution



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