2,3-DI-N-ALKOXYANTHRAQUINONES AS GELATORS OF ORGANIC-SOLVENTS

The gelling ability of a series of dialkoxy-9,10-anthraquinone derivat ives has been investigated in a number of organic solvents at differen t concentrations. The most efficient systems were found to be formed f rom the 2,3-dialkoxy (OCnH2n+1) derivatives with n = 8-11 (compounds 9 -11 14-15). In ethanol, a gel is formed with 2,3-di-n-decyloxyanthraqu inone (11) at a concentration of ca. 10(-2) M (0.65 g/100 g) at 30 deg rees C. The gel-to-sol transition temperatures were determined in etha nol, isopropanol and n-heptane as a function of gelling agent concentr ation. The gel-to-sol transition enthalpies (23-51 kJ mol(-1)) were fo und to be in agreement with recent results obtained for other gel form ing systems.