Abstract The dimer [(Me 3 SiCH 2) 2 AsGaPh 2] 2, obtained from the reaction of (Me 3 SiCH 2) 2 AsH with Ph 3 Ga, has been characterized by partial elemental analysis, NMR spectroscopy, cryoscopic molecular weight determination, and complete single-crystal X-ray analysis. Crystals of the dimer are triclinic, space group P Full-size image (< 1 K)