|Title:||Reactivity of Disodium and Dilithium Tetraisopropdxonickelates (II) With Some Selected N - Acidic Ligands|
Dr. Niguussie Retta
|Publisher:||Addis Ababa University|
|Abstract:||The syntheses of dilithium and disodium tetraiso-propoxonickelate(II) were achieved using a novel starting compound, Ninr2.2DME. This nickel(II) compound was found to be easy to prepare and a relatively stable compared to the commonly used starting annlogue, NiBr2.2thf, which was difficult to prepare and easily hydrolized on exposure to air. Electronic spectra and magnetic moment of Ni[1r2,2DME indicate on octahedral type coordination of nickel(II) in solutions The two alkoxonickelntes synthesized from Nif3r2.2DME were found to be identical with those prepared using NiBr2.2thf. Using intramo-lecular redox properties of the above isopropoxonicke-lates, a series of low volent nickel complexes were synthesized. A yellow-brownish complex, Ni(PrIh3)2(COD) was synthesized starting from Na2Ni(OiPr)4.2thf. White, tetrakis complexes of Ni(o) with friallyl phosphite, triphenyl phosphite, and orange to yellow-brownish bis complex of 1,2-bis(diphenylphosphino)ethnne were synthe-sized from either alkoxonickelates. In every case, the complexes synthesized from lithium and sodium deriva-tives were found to be the s9me. All the above complexes were observed to be unstable in air. The results obtained support the assumption of zero-valent nickel species to be active in catalytic systems consisting of Ni(II); PR3, and primary and primary rind secondary ilkoxides which can he used to transfer 1,3-dienes into dimers and oligomers.|
|Description:||A Thesis Presented to the School of Graduate Studies Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Chemistry|
|Appears in Collections:||Thesis - Chemistry|
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