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Matrix isolation study of the reaction of trimethylaluminum with hydrogen sulfide and mercaptans: synthesis and spectra of molecular aluminum sulfide

The high-temperature pyrolytic reaction of (CH 3 ) 3 Al with H 2 S followed by trapping into argon matrices at 14 K has led to the formation and isolation of molecular Al 2 S 3 . Identification was made based on band positions, lack of deuterium shift, the observation of CH 3 D when D 2 S was employed, and a poor spectral match to known aluminum sulfides and by analogy to the molecular species B 2 O 3 and Al 2 O 3 . The spectra are suggestive of a V-shaped molecule, also similar to B 2 O 3 and in contrast to the linear structure of Al 2 O 3