Gallium complexes amido

The chemistry of indium complexes of aU types in metal oxidation states lower than +3 has been comprehensively reviewed. Few lower oxidation state mononuclear amido complexes of indium are well characterized, however, and no structure has been reported for an In(I) amide. The compound In N(SiMe3)2 n. which is unstable, " has been characterized NMR spectroscopy but its structure is unknown. The structures of several In(I) complexes, related to amides but outside our current scope, have been described. Like its aluminium and gallium counterparts, the p-diketuninate derivative [ In N(Dipp)C(Me) 2CH] has been characterized, as has the closely related species [ In N(Dipp)C(CF3) 2CH]. ° These feature V-shaped, two-coordination at the metal. The less bulky [(In N(Mes)C(Me) 2-CH)2] ° and 15-2.6-.Vlc,)( (Me) i are dimeric with long In In bonds of... 

Tridentate diamidoether (N,0,N) ligands have been used as supports for a series of A1 and Ga complexes with amide and aUcoxide initiators (Figure The A1 ate complexes polymerize rac-LA with moderate heteroselectivity (P =0.65-0.67). In comparison, the related neutral aUcoxy dimer requires more forcing conditions to reach high conversions and is isoselective (P =0.62)J The related aluminum and gallium amido complexes are more active than the alkoxide and can generate PLA with p =0.70. i... 

When gallium is dissolved in a solution of KOH in liquid NH3, a salt K[I] is formed which is an amido complex of Ga(III). Heating one equivalent of K[I] at 570 K under vacuum liberates two equivalents of NH3, and produces a Ga(III) imido complex K[II]. Partial neutralization of K[I] with NH4CI yields Ga(NH2)3. Suggest identities for the salts K[I] and K[II], and write equations for the thermal decomposition and partial neutralization reactions of K[I]. Hint an imido complex formally contains. ... 

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