First Organogallium Four-Membered Ring Compound with Arsenic, Halogen Mixed Bridging: Synthesis and Crystal Structure of Ph2GaAs(SiMe3)2Ga(Ph)2Cl

摘要

Ph2GaAs(SiMe3)2Ga(Ph)2Cl(1)has been isolated from the products of the room temperature reaction of Ph2GaCl with(Me3Si)3As(reactants mixed in both a 2:1 and a 3:1 mole ration). A mixture of 1 and Ph2GaAs(SiMe3)22 (2)was isolated after heating a 1:1 mole ration combination of the same reactants. Reaction of pure 2 PREPARED FROM Ph2GaCl and LiAs(SiMe3)2 with Ph2GaC1 resulted in the formation of(1). Prolonged heating of 1 produced a mixture of 2, Me3SiCl and unidentified products. Compound 1 was structurally characterized by a single crystal X ray analysis and shown to be the first organogallium four-membered ring compound with both an arsenic and a halogen bridge. The ring of 1 is clearly non-planar as evidenced by the fact that the Cl atom is displaced from the Ga-As-Ga' plane to yield a dihedral angle of 8.8 degrees between the Ga-As-Ga' and Ga-Cl-Ga' planes. Various other features of the structure of 1 are discussed. Gallium arsenides. (mjm)