Synthesis and Crystal Structures of Aluminum, Gallium and Indium Complexes with Chelating Me 2 Si(NPh) 2 2– Ligands

The reaction of E Cl 3 ( E = Al, Ga) with two equivalentsof Li 2 Me 2 Si(NPh) 2 (in diethyl ether/ n ‐hexane) leads to the formation of bis‐chelate complexes [Li(OEt 2 ) 3 ][ E {Me 2 Si(NPh) 2 } 2 ] ( E = Al ( 1 ), Ga ( 2 )). Compounds 1 and 2 crystallize isotypically in the monoclinic system with a = 1136.42(6), b = 3267.9(1), c = 1360.37(8) pm, β = 94.320(7)° for 1 and a = 1140.88(6), b = 3261.7(2), c = 1360.20(8) pm, β = 94.641(7)° for 2 . Both the compounds display a distorted tetrahedral coordination of the central metal atom to give a spirocyclic E N 4 Si 2 core. The Al–N bond lengths are in the range of186.5–186.9 pm and for the Ga–N distances values between 192.3and 193.1 pm are observed. Treatment of InCl 3 with three equivalents of Li 2 Me 2 Si(NPh) 2 yields the tris‐chelate [{Li(OEt 2 )} 3 In{Me 2 Si(NPh 2 )} 3 ] 3 . Compound 3 crystallizes in the trigonal crystal system , space group R $\bar{3}$ c with a = 1852.4(1), and c = 3300.2(2) pm. The central indium atom is coordinated by threeMe 2 Si(NPh) 2 2– ligands in a distorted octahedral arrangement withIn–N bond lengths of 230.8 pm.