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Formation of gaseous ring and cage compounds by thermolysis of the complexes between group 13 metal halides MX 3 and ethylenediamine (en) has been observed experimentally by mass spectrometry method (M=Al, Ga; X=Cl, Br, I) and studied theoretically. Existence of gaseous associates with molecular weight of 600–900amu was observed for all studied systems. The abundance of the high molecular...