Germanium-antimony bonds

Organogermanes R, GeX (X = H, MeO, Cl, Br) do not react with antimony(V) fluoride/carbon, but allyl —germanium bond breaking occurs under mild conditions (24 h at 25 C in diethyl ether), and in high yields (80-85%), leading to the corresponding fluorogermanes.101... 

Many elemental metalloid surfaces, on the other hand, are considered to have perturbed structure when clean. Examples are the (HI), (HO), and (100) faces of silicon and germanium 126a, 338), the (HI) and (100) faces of diamond 286, 287), the (1120) planes of bismuth and antimony 297), and the (1000) surface of tellurium 325). It is believed that the (HI) and (100) planes of GaAs have altered periodicities also 133, 339). Distortions of all these covalently bonded surfaces are explained by assuming configurations that partially satisfy the free valence of the strongly directional cut bonds. These structures are complex and not yet completely determined 340-344). 

Many metal carbonyl clusters have interstitial atoms or groups located in the eenter of the polyhedron. Such interstitial atoms may be a light atom sueh as boron, carbon, or nitrogen a post-transition element such as germanium, tin, or antimony or a transition metal. Interstitial atoms most frequently provide all of their valence electrons as skeletal electrons since all of their valence orbitals are neeessarily internal orbitals because of the location of the interstitial atom in the center of the polyhedron. Exceptions to this rule may occur when some of the valence electrons of the interstitial atom occupy orbitals of symmetries which cannot mix with any of the molecular orbitals arising from the polyhedral skeletal bonding. 

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