Two homologous series of 1-(4-alkoxy-2-hydroxyphenyl)-3-(3,4,5-trialkoxyphenyl)propane-1,3-diones and 1-(2-hydroxyphenyl)-3-(3,4,5-trialkoxyphenyl)propane-1,3-diones were prepared by base-catalysed rearrangement of 4-alkoxy-2-(3,4,5-trialkoxybenzoyloxy)acetophenones and 2-(3,4,5-trialkoxybenzoyloxy)acetophenones, respectively. The reaction of these β,δ-triketones with copper(II) acetate gave liquid-crystalline dicopper complexes, bis[1-(4-alkoxy-2-hydroxyphenyl)-3-(3,4,5-trialkoxyphenyl)propane-1,3-dionato]- and bis[1-(2-hydroxyphenyl)-3-(3,4,5-trialkoxyphenyl)propane-1,3-dionato]-copper(II) . These copper complexes exhibit disordered hexagonal columnar (Dhd) mesophases which were identified by DSC analysis and polarized optical microscopy, and were also confirmed by X-ray powder diffraction. The variable-temperature EPR spectra were also studied.
|Number of pages||5|
|Journal||Journal of the Chemical Society - Dalton Transactions|
|State||Published - 21 Dec 1997|