Imines meta complexes

A few copper and nickel complexes based on A-alkyl[5-(4-decyloxybenzoyloxy]salicylaldimine (alkoxybenzoate group meta to the ring position of the imine carbon) were also prepared and their mesomorphism compared to that of their isomers (213). Except for the A-methyl derivatives which exhibited enantiotropic phases over large temperature ranges (M = Cu Cr 188 SmC 243 N 267 I, M = Ni Cr 240 SmC 267 N 281 I), the mesomorphism was in general suppressed. The range of the nematic phase diminished drastically for the A-ethyl derivative (M = Cu Cr 164 N 170 I) the phase was suppressed or monotropic for longer alkylamine chains. 

---