The binary system of selenium tetrachloride with aluminium chloride and of tellurium tetrachloride with aluminium chloride

The binary freezing‐point diagrams of SeCl4AlCl3 and TeCl4AlCl3 were determined. Both systems show a dissociating compound in a molecular ratio 1: 1 with melting points of 163.8° C resp. 149.3° C. In the case of the binary system SeCl4AlCl3 only one half of the system, with AlCl3 in excess, could be determined because of the decomposition of SeCl4 at higher temperatures. The compound TeCl4 · AlCl3 could be distilled in high‐vacuum without decomposition. An approximate value for the heat of fusion of both addition compounds was calculated.