The Synthesis And Chracterization Of Boron?Germanium?Tin Compounds Supported By New ?-diketiminato Ligand

In the master's research work,through a salt metathesis reaction,this thesis use the three type of ?-diketimine:?-diketiminato ligand 1,a new type of ?-diketiminato ligand 13[MeC(PhCNDip)2H;Dip = 2,6-'Pr2C6H3]and ?-diketiminato ligand 17[PhC(PhCNDip)2H;Dip = 2,6-Pr2C6H3].The new ?-diketiminato ligand with stable skeleton and adjustable side-groups,especially ?-diketiminato ligand 13 and 17,without active proton at a-position was prepared.The ?-diketiminato boron(I)monomer is still unknown for many years after the reported of ?-diketiminato aluminum(?).The syntheses of ?-diketiminato chlorogermylene and chlorostannylene have been successfully separated.The compounds have been analyzed by X-ray diffraction and NMR spectroscopy.1??-diketiminato hydroxy boron[LBBrOH]6 based on ?-diketiminato ligand 1,was synthesized.The anionic oxoboranes 8 prepared from[LBBrOH]6 by deprotonation of the hydroxy with N-heterocyclic carbenes(NHCs).Dihaloboranes based on ?-diketiminato ligand 1,was not separated.The subsequent reaction of dihaloboranes with KC8 affords the borane 11,which can be regarded as the C-H activation product.2?The reaction of the lithiation product of ligand 13[MeC(PhCNDip)2H;Dip = 2,6-Pr2C6H3]with GeCl2·dioxane or SnCl2 afforded the ?-diketiminato chlorogermylene 15 and chlorostannylene 16[MeC(PhCNDip)2MCl;M = Ge(15),Sn(16)],respectively.In the structure of compounds 15 and 16,the bonds between Sn or Ge with adjacent atoms are longer than average,indicating the hybridization of atomic orbitals for heavy main-group elements is not realized in their low-valent compounds.3?The reaction of the lithiation product of ligand 17[PhC(PhCNDip)2H;Dip = 2,6-Pr2C6H3]with GeCl2·-dioxane afforded the ?-diketiminato chlorogermylene 19[PhC(PhCNDip)2GeCl].In the structure of compounds 19 also indicated the hybridization of atomic orbitals for heavy main-group elements are not realized.The structure of product 20[PhC(PhCNDip)2Na(Et2O)]was obtained from the reaction of the ?-diketiminato ligand 17 with sodium amide.In the direct preparation of dihaloboranes(LBBr2),sysththesized and characterizd the co-crystallized compound 22.