Spectrochemical Study of Microscopic Crystals. XXII. The Structure of Cupric Mono-, Di- and Trichloroacetate

Abstract

Abstract In order to examine the structure of cupric chloroacetates, the dichroism in the visible and the ultraviolet region has been determined at room temperature by the microscopic method with mono-, di- and trichloroacetate. Visible and ultraviolet absorption spectra have also been determined with the above compounds in organic solvents. The monochloroacetate consists of the binuclear molecules of the acetate-type in the crystalline state and in solution. It has been found that there is another form of the anhydrous monochloroacetate, which is colored blue and contains no binuclear molecule. The dichloroacetate exists as binuclear molecules in ethyl ether and dioxane, but as mononuclear complexes in ethanol. The anhydrous dichloroacetate in the crystalline state consists of binuclear molecules of the acetate-type. The trichloroacetate exists as mononuclear complexes in ethanol and in dioxane, and in the crystalline state. The compound exists as binuclear molecules in ethyl ether. Crystals of another form have also been obtained. These possibly consist of binuclear molecules.