514807-58-0Relevant academic research and scientific papers
Syntheses and X-ray structures of monocyclic, bicyclic, and spirocyclic gallium and indium boraamidinates
Chivers, Tristram,Fedorchuk, Chantall,Schatte, Gabriele,Parvez, Masood
, p. 2084 - 2093 (2003)
The reactions of {Li2[PhB(NtBu)2]}2 with GaCl3 in various stoichiometries yield [Li(thf)4][PhB(μ-NtBu)2 GaCl2·GaCl3] (1), [PhB(μ-NtBu)2GaCl]2 (2), and {μ-Li(OEt2)[PhB(NtBu)2]Ga} (3a), a series of complexes in which the three chloride ligands are successively replaced by the dianion [PhB(NtBu)2]2-. The X-ray structures of 1, 2, and 3a show that the boraamidinate ligand adopts an N,N′-chelating mode. In the ion-separated complex 1, one of the nitrogen atoms is coordinated to a GaCl3 molecule. The related indium complexes [μ-LiCl(thf)2][PhB(μ-NtBU)2 lnCl]2 (4) and {μ-Li(OEt2)[PhB(μ-NtBu)2]ln} (3b) were obtained in a similar manner. Complex 4 is the indium analogue of 2 with the incorporation of a bissolvated LiCl molecule. In 3a and 3b the spirocyclic {[PhB(μ-NtBu)2]2M}- (M = Ga, In) anions are N,N′-chelated to the [Li(OEt2)]+ counterion. Prolonged reactions result in the formation of [PhB(μ- NtBu)2GaCl][tBuN(H)GaCl2] (5) and {[PhB(μ-NtBu)2lnCl][tBuN(H) lnCl2][μ-LiCl(OEt2)2]} (6), respectively. The X-ray structures of 5 and 6 reveal bicyclic structures which formally involve the entrapment of the monomers tBuN(H)-MCl2 by a four-membered BN2M ring (M = Ga, ln). The synthesis and X-ray structure of Cl2Ga[μ-N(H)tBu]2GaCl2 are also reported.
