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The four ternary gallium(III) chalcogenide halides GaEX with E = S, Se and X = Cl, Br can be prepared a) from the binary gallium(III) chalcogenides Ga 2 E 3  and halides Ga 2 X 6 , b) from gallium(I) tetrahalogallates(III) GafGaX 4 ] and the chalcogen E, and c) from gallium metal and the dichalcogen dihalides E 2 X 2 . The new method c) was shown to be the most convenient preparation. The products are readily soluble in pyridine to give trinuclear molecular complexes [GaEX·Py] 3  which are not volatile without decomposition, but can be purified by crystallization. The structures have been determined by single crystal X-ray diffraction techniques. The two chlorides are isostructural and show twisted tub-form six-membered ring molecules with the pyridine donors in axial positions. The two bromides are also isostructural, but with the pyridine ligands in two axial and one equatorial positions

Soluble Pyridine Complexes Of The Ternary Gallium(III) Chalcogenide Halides (GaEX) 3 , With E = S, Se And X = Cl, Br