| Summary: | 碩士 === 國立中央大學 === 化學系 === 86 === Abstract
The thesis describes the preparation of a series of ligands; N,
N'- bis[3-(3',4'-dialkoxyphenyl)-3-
oxopropenyl]ethylenediamines, and their complexes with
copper(II), nickel(II), cobalt(II) and vanadyl(IV)
acetates. Meanwhile, the preparation of the ligands;
5-alkyl-1,3-bis[5' -(3'', 4''-dialkoxyphenyl)-1', 3',
5'-trioxopentanoxyl] benzenes (20) 及 [3'-(3'',
5''-dialkoxybenzene)-5'-methyl)pyrazol-1'-yl]ethyl ethers
(26) is also reported. All the ligands were characterized by 1H-
and 13C- NMR spectroscopy, and metal complexes were
characterized by element analysis and IR data.
In this thesis we will examine the mesomorphic properties, and
also study the structure of mesophases of copper(II) ,
nickel(II), cobalt(II), and vanadyl(IV) complexes derived
from N,N'-bis[3-(3',4'-dialkoxyphenyl) -3-oxopro-
penyl]ethylene-diamines. Data showed that nickel(II),
cobalt(II) and vanadyl(IV) complexes exhibited columnar liquid
crystalline phases, however, all copper complexes formed only
crystalline phase. The mesomorphic properties were characterized
by DSC analysis, optical polarized microscope, and the
structure of mesophases was confirmed as columnar
hexagonal arrangement by power XRD diffraction.
The effect on the formation of mesophase by incorporation with
various metal centers will be studied as well in this thesis. In
additions, the formation of mesophases on the numbers of side
chains and the length of the carbon chains will be
investigated in detail. However, two other types of
ligands; 5-alkyl-1,3-bis[5'-(3'', 4''-
dialkoxyphenyl)-1', 3', 5'-trioxopentanoxyl]benzenes (20)
[3'-(3'', 5''-dialkoxybenzene)-5'-methyl)pyrazol-1'-
yl]ethyl ethers (26) were also prepared and reporte,
and their complexes with transition metal are in process
in our laboratory.
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