Preparation, characterization and mesomorphic properties of nickel and copper complexes derived from N,N '-bis[3-(3 ',4 '-dialkoxyphenyl)-3-oxopropenyl]ethylenediamine
Ck. Lai et al., Preparation, characterization and mesomorphic properties of nickel and copper complexes derived from N,N '-bis[3-(3 ',4 '-dialkoxyphenyl)-3-oxopropenyl]ethylenediamine, J MAT CHEM, 8(12), 1998, pp. 2605-2610
The preparation, characterization and mesomorphic properties of copper and
nickel complexes derived from N,N'-bis[3-(3',4'-dialkoxyphenyl)-3-oxopropen
yl] ethylenediamine sire reported. Liquid crystalline behavior for these st
ructurally similar complexes was found to be strongly dependent both on the
number of sidechains and metal centers incorporated. Nickel complexes with
four or six alkoxy sidechains exhibited columnar phases. However, nickel c
omplexes with two alkoxy sidechains and all copper complexes regardless the
numbers of the sidechains were not liquid crystalline. The structure of th
e mesophases was confirmed as columnar hexagonal (Col(h)) by powder XRD dif
fraction. The data that the copper complexes have slightly lower isotropic
temperatures than the analogous nickel complexes suggested that the lack of
liquid crystallinity for the copper complexes may be attributed to weaker
molecular interactions. The results also indicated that nickel complexes wi
th four sidechains showed a wider range of mesophase temperature than compl
exes with six sidechains.