Synthesis and Characterization of Aluminum and Gallium Complexes of Heterocyclic Carboxaldehyde Thiosemicarbazones. Single-Crystal Structure of [(MeAl){NC4H3CHNNC(S)NiC3H7}(AlMe2)]2and (GaMe2)2[SC4H3CHNNC(S)NPh]

Novel tetranuclear metal complexes with the formula [(MeM){NC 4 H 3 CHNNC(S)NR}(MMe 2 )] 2 (M = Al, R = i C 3 H 7 ( 1 ); M = Ga, R = i C 3 H 7 ( 2 ); M = Al, R = Me ( 3 ); M = Ga, R = Me ( 4 )) result when pyrrolecarboxaldehyde thiosemicarbazone ligands are mixed with trimethylaluminum and -gallium. Four dinuclear metal compounds with the formula (MMe 2 ) 2 [SC 4 H 3 CHNNC(S)NR] (M = Al, R = i C 3 H 7 ( 5 ); M = Ga, R = i C 3 H 7 ( 6 ); M = Al, R = C 6 H 5 ( 7 ); M = Ga, R = C 6 H 5 ( 8 )) were synthesized by the methane elimination reaction of thiophenecarboxaldehyde thiosemicarbazones with trimethylaluminum and -gallium. The X-ray crystal structures of 1 and 8 are described. The structural data revealed that 1 is a tetranuclear aluminum compound with an eight-membered ring system and 8 is a dinuclear gallium compound with a weak interaction between the pendant thiophene and the gallium center.