Synthesis and Characterization of Ionic Liquids Based on O-Phenanthroline
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Date
2010-06
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Addis Ababa Universty
Abstract
Ionic liquids are organic salts with melting point below 1000C. Their unique properties
such as negligible vapor pressure, wide ectrochemical window and solvent properties
have brought about an amazing interest in these salts. One of the most common research
areas based on ionic liquids as a solvent focuses on homogeneous catalysis since ionic
liquids are found to be ideal immobilizing agents for various classical transition metal
catalyst precursors. In the present study we have tried to synthesize new ionic liquids
based on phenanthroline taking in to account that it could easily dissolve transition metal
catalysts based on phenanthroline due to similar structure it possesses. In the present
work, new and monoalkylated salts based on phenanthroline, have been synthesized and
investigated. An attempt to dialkylate this salts failed due steric and electronic factors.
These Salts were characterized by various physical and spectroscopic techniques:
1HNMR, 13C NMR and elemental analysis their melting point, conductivity, miscibility
with water and organic solvents were determined. The influence of alkyl substituent
along with nature of the anion on the NMR chemical shift of the neighboring hydrogens
is also discussed. These compounds were also analyzed by melting point and factors such
as size of the anion, delocalization of the charge interaction between the ions and
disorder(asymmetry) in the cation affected the packing of the ionic liquid and thereby the
observed melting point.
Key words: ionic liquids 1, 10-phenanthroline, quaternization, homogeneous catalysis
Description
Keywords
ionic liquids 1; 10-phenanthroline; quaternization; homogeneous catalysis