Synthesis and structures of the crystalline heavier alkali metal alkyls: X-ray structures of [K(mu-R){O(Me)Bu-t}](infinity), [(pmdeta)K(mu-R)K(mu-R)(2)K(mu-R)K(pmdeta)], and [Cs(mu-R)(tmeda)]infinity (R = CH(SiMe3)(2))

Novel dinuclear metal complexes with the general formula [(Me2M){NC5H4 C(R) NNC6H5}-(MMe3)] (M = Al, R = CH3 (1); M = Ga, R = CH3 (2); M = Al, R = H (3 ); M = Ga, R = H (4)) result when 2-pyridinecarboxaldehyde phenyl hydrazone ligands are mixed with trimethylaluminum and -galbium. The decagallium com plex (GaMe2)(8)(GaMe)(2)(mu(4)-O)(2)(mu(3)-O)(4)(C12H10N3)(2) (5) was isola ted during the synthesis of 4 as a minor orange product. Three dinuclear me tal compounds of the general formula [(Me2M)(SC4H3CHNNC6H5)](2) (M = Al (6) ; M = Ga (7); M = In (8)) were synthesized by the methane elimination react ion of thiophenecarboxaldehyde phenylhydrazone with trimethyl aluminum, -ga llium, and -indium. The mu 4-oxo complex [(Me2In)(2)(OC4H3CH NNC6H5)](2)O ( 9) was prepared via the reaction of furancarboxaldehyde phenylhydrazone wit h trimethylindium. The X-ray crystal structures of 1, 4, 5, 7, and 9 are de scribed. The structural data revealed that 5 is a decanuclear gallium compo und that contains an eight-membered Ga4O4 cyclic core and that 9 is a tetra nuclear indium compound with a weak interaction between the pendant furan a nd the indium center.