Synthesis and Characterization of 4,4’-Bipyridine Based Ionic Liquids (Ils)
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Date
2010-06
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Addis Ababa Universty
Abstract
Ionic liquids are salts with low melting points (<100 0C). Since ionic liquids exhibit extremely
low vapor pressures, they do not release VOCs to the environment; and have positive impact on
ecological and environmental effect during synthesis and processing of chemicals. They provide
good solubility for a wide range of reactions, their design for use as solvents can serve both for
immobilization and coordinating ligands for the catalyst in processes involving homogeneous
catalysis. This can be addressed by synthesizing ionic liquids with functional groups that can
complex the metal centers. To this effect, they are called designer and eco-friendly solvents.
These interesting compounds are achieved either by incorporating a bulky, asymmetric Nheterocyclic
cation into the structure through quaternization process in order to preclude good
crystal packing and/or by selecting an anion in which there is considerable delocalization of the
electron cloud over the molecular backbone that tends to decrease interionic interaction,
example-bis(trifluoromethylsulfonyl)amide.
Therefore the main objective of this project is to synthesize such important ionic liquids based on
4,4’-bipyridine heterocycles through quaternization with alkyl halides which are applicable in
homogeneous catalysis as solvents, solvent and ligand, and electrochemical uses in
electrodeposition.
As a result of this quaternization reaction monoalkylation has been successfully done in which
the products were confirmed by Spectroscopic techniques, analytical data (elemental analysis)
and different physical techniques having melting point of almost higher than 2000C. After
metathesis process the melting point of the prepared ILs have <800C which fulfills the first
criteria to be true ILs with melting point of <1000C.
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4,4’-Bipyridine Based Ionic Liquids (Ils)