Structure and vaporization of a gallium tribromide aminomethylpyridine complex

The structure of a gallium tribromide complex with 2-aminomethylpyridine (amPy) (1: 1) has been established by single-crystal X-ray diffraction for the first time. The complex has been shown to have the ionic structure [GaBr 2 amPy 2 ] + [GaBr 4 ] − in the condensed phase. The qualitative composition of the vapor over the complex has been determined by mass spectrometry within a temperature range of 80–250°C. The elimination of hydrogen bromide and 2-aminomethylpyridine proceed at 80–180°C to enrich the condensed phase with gallium tribromide. GaBr 2 (amPy-H), GaBr 3 amPy, GaBr(amPy-2H), and Ga 2 Br 5 (amPy-H) are the major gallium-containing vapor species at 250°C.