Synthesis and structural characterisation of gallium and indium fluoroalkoxide ‘ate’ complexes
摘要:
The treatment of InCl3 with MOCH(CF3)(2) (M = Li, Na, K) in a 1: 6 stoichiometry, followed by recrystallisation results in the formation of the bimetallic "ate" complexes [Na3In(OCH(CF3)(2))(6)(THF)(3)] (2) and [Li3In(OCH(CF3)(2))(6) (THF)(3)] (5) from hexane, and [K3In(OCH(CF3)(2))(6)](n) (4) from a THF and toluene mixture. If a 1: 3 stoichiometry is used chloride containing compounds [Na2InCl(OCH(CF3)(2))(4)(THF)(4)] (1) and [KInCl2 (OCH(CF3)(2))(2)(THF)(3)](n) center dot THF (3) are obtained on recrystallisation from hexane. Treatment of GaCl3 with 6 equivalents of LiOC(CH3)(2)CF3 gives [LiGa(OC(CH3)(2)CF3)(4)(THF)(2)] (6) on recrystallisation from hexane. The protolysis reaction between In(N(SiMe3)(2))(3), formed in situ from (Me3Si)(2)NH, (BuLi)-Bu-n and Incl(3), and HOCH(CH3) CF3 results in isolation of [LiIn(OCH(CH3) CF3)(3)Bu](2) (7) from hexane. The structures of 2, 4, and 5 all contain the tetranuclear core InO6M3. Compounds 1 and 3 have residual chloride; 1 is a trinuclear species with two THF ligands per Na, while 3 is a linear polymer. Compound 6 has a GaO2Li four-membered parallelogram at its core. Complex 7 has a tetranuclear In2O6Li2 core and an unexpected Bu-n group on the In atoms. The coordination spheres of the alkali metals in 1-6 include solvated THF while 1-5 display additional close M center dot center dot center dot F interactions. (C) 2008 Elsevier B. V. All rights reserved.