Synthesis of heteroleptic gallium-substituted antimony hydrides by stepwise β-H elimination

Heteroleptic stibanes Cp*(R)SbCI (R = Dip 1, N(SiMe3)(2) 2, OB(NDipCH)(2) 3; Cp* = C5Me5; Dip = 2,6-i-Pr2C6H3) react with monovalent gallanediyl LGa (L = HC[C(Me)N(Dip)](2)) with elimination of 1,2,3,4-tetra-methylfulvene, yielding heteroleptic metal-stabilized Sb hydrides [L(Cl)Ga](R)SbH (R = Dip 4, N(SiMe3) 2 5, OB(NDipCH)(2) 6). Compounds 1-6 were characterized by heteronuclear NMR (H-1, B-11, C-13) and IR spectroscopy, and the solid-state structures of 4-6 were determined by single-crystal X-ray diffraction. A close correlation between the H-1 NMR chemical shift of the hydride ligand and the electronegativity of the Sb-coordinating atoms was revealed.