Поищите тут:
Dohmeier, C.; Loos, D.; Schnöckel, H. "Aluminum(I) and Gallium(I) Compounds: Syntheses, Structures, and Reactions".
Uhl, W. "Organoelement Compounds Possessing Al—Al, Ga—Ga, In—In, and Tl—Tl Single Bonds".
M. Witt; H. W. Roesky. "Organoaluminum chemistry at the forefront of research and development"