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Combination of the Lewis bases Cp2MH2 (where M = W or Mo) with the Group III Lewis acids AlR3 (where R = Me, Et, or Ph) and AlMe2H has yielded a series of 1:1 complexes of the type Cp2MH2•AlR3. A number of the complexes undergoes a slow elimination of hydrogen or alkane in benzene solution. Attempts to isolate mixed hydride adducts of the type, Cp2MH2•M′H3 (where M′ = Al or Ga), were unsuccessful.

Direct combination of the Lewis acids, Me3M (where M = B, Al, Ga, or In), and the diamines, Me2N-(CH2).NMe2 (where n = 1 , 2 , or 3) has given two series of complexes. A range of 1 :I complexes can be isolated w~t h Me2NCH2NMe2 as ligand. With the other diam~nes, use of a 1 :I molar ratlo of reactants yields crystalline 2:1 complexes with two moles of Me3M per mole of I~gand. Excluding the reactlon between Me3B and Me2NCH2NMe2, 2:1 complexes can be isolated by reacting the varlous Lewrs acids with the appropriate molar quantlty of the diam~nes. The complexes have been charactenzed by i.r. and proton n.m.r. spectroscopy and molecular weight measurements.A number of complexes of Me3Ga w~t h methyl substituted ethylenediamines have been prepared and the effects of substitution on the n~trogen ligand atoms studied. Pyrolysis of these complexes has demonstrated the ready elimination of methane and has resulted in the formation of condensed Ga-N specles.

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