Synthesis and characterization of III-V semiconductor precursors and homogeneous catalysts for olefin polymerization

In Chapter 1, paramagnetic phenylnacnac titanium, vanadium, and chromium complexes have been synthesized as bis THF adducts from the bidentate Phenylnacnac ligand. All of the phenylnacnac metal (Ti, V, Cr) dichloro complexes were very reactive in ethylene homopolymerization. (Ph)nacnacTiCl{dollar}sb2{dollar}(THF){dollar}sb2{dollar} (1a) and (Ph)nacnacVCl{dollar}sb2{dollar}(THF){dollar}sb2{dollar} (1b), activated with MAO, were capable of copolymerization of ethylene with 1-hexene or propene as well as homopolymerization of 1-hexene to give oligomers. Some vanadium alkyl compounds and cationic complexes were prepared from 1b, and their reactivities are discussed.; In Chapter 2, potential organometallic single-source molecules, (Ph)nacnacM(N{dollar}sb3)sb2{dollar} (7a: Al, 7b: Ga) and (Ph)nacnacM(NMe{dollar}sb2)sb2{dollar} (8a: Al, 8b: Ga) for group III-nitride thin film growth by MOCVD, have been synthesized by metathesis from their respective dichloro precursors, (Ph)nacnacMCl{dollar}sb2{dollar} (6a: Al, 6b: Ga). These compounds were characterized by means of {dollar}sp1{dollar}H, {dollar}sp{lcub}13{rcub}{dollar}C NMR, mass spectroscopy, FTIR, TGA, and elemental analysis. Also, structure determinations by X-ray diffraction of 7a, 8b, and (Ph)nacnacInCl{dollar}sb2{dollar} (6c) were carried out.; In Chapter 3, nanometer-sized clusters of InP and GaAs were prepared in solution under mild conditions by alcoholysis of single-source organometallic precursor molecules. The surface-functionalized clusters afforded isolation of redispersible clusters terminated by covalently bound organic ligands. Amorphous and crystalline nanocluster materials have been isolated by employing different reaction solvents. A subsequent annealing of amorphous InP resulted in crystalline material. However, the soluble InP clusters became insoluble due to the loss of the surface functional groups. The amorphous and crystalline materials were characterized using differential scanning calorimetry, X-ray powder diffraction, and transmission electron microscopy.