in ethanol prepn. by refluxing ZnO with excess of carboxylic acid in EtOH for about2 h; cooled; ppt. filtered off; washed (EtOH) repeatedly; collected; kept over silica gel in vac. desiccator; elem. anal.;

in ethanol; water stoich. amt. of aq. soln. of ZnCl2 added to alcoholic soln. of org. compd.; ppt. filtered and washed with EtOH and water, characterized by powder XRD patterns;