Dr. Stephen O. Ojwach

BSc Hons (Nairobi), MSc (UWC), PhD (UJ)


     Senior Lecturer (Inorganic Chemistry)

        Office 34
        Chemistry Building
        Cnr. Golf & Ridge Roads
        Pietermaritzburg Campus

        Tel: +27(0) 33 260 5239
        Fax: +27(0) 33 260 5009

        Email: Ojwach@ukzn.ac.za


Research Interests

    • Synthesis and structural elucidation of inorganic and organometallic complexes of late transition metals.

    • Design and development of nitrogen and phosphine donor transition metal catalysts for olefin oligomerization, 
        polymerization, hydroformylation and hydrogenation reactions.

    • Molecular modelling using Density Functional Theory in theoretical investigations of the thermodynamics and kinetics of 
        catalytic processes.


Selected Publications

    • Stephen O. Ojwach, George S. Nyamato, Benard Omondi, Alexander O. Okoth, James Darkwa, Multidentate Bis
        (pyrazolylmethyl)pyridine Ligands: Coordination Chemistry and Binding properties with Zinc(II) and Cadmium(II) 
        Cations, J. Coord. Chem. 65 (2012) 298-307.

    • Letitia L. Benade, Stephen O. Ojwach, Collins Obuah, Ilia A. Guzei, James Darkwa, Vinyl-addition polymerization of 
        norbornene catalyzed by (pyrazol-1-ylmethyl)pyridine divalent iron, cobalt and nickel complexes Polyhedron, 30 
        (2011) 2878-2883.

    • Stephen O. Ojwach, Martin O. Onani, Emmanuel I. Iwuoha and James Darkwa, Novel Hemi-labile pyridyl-imine 
        palladium complexes: Synthesis, Molecular structures and Reactions with Ethylene William M. Motswainyana 
        Polyhedron, 30 (2011) 2574-2580.

    • Michael K. Ainooson, Stephen O. Ojwach, Ilia A. Guzei, Lara C. Spencer, James Darkwa, Pyrazolyl iron, cobalt, 
        nickel and palladium complexes: synthesis, molecular structures and evaluation as ethylene oligomerization catalysts, J. 
        Organomet. Chem
. 696 (2011) 1528-1535.

    • Stephen O. Ojwach and James Darkwa, Pyrazole and (pyrazol-1-yl)metal complexes as carbon-carbon coupling 
        catalysts Inorg. Chim. Acta. Rev. 363 (2010) 1947-1964.

    • Stephen O. Ojwach, Benade Letitia, Ilia A. Guzei, James Darkwa, Selwyn F. Mapolie, (Pyrazol-1-ylmethyl)pyridine 
        nickel complexes: ethylene oligomerization and unusual Friedel-Crafts alkylation catalysts, Organomatellics 28 (2009) 

    • Frankline K. Keter, Stephen O. Ojwach, Olayinka A. Oyetunji, Ilia A. Guzei, James Darkwa,Bis(pyrazolyl)palladium
        (II), platinum(II) and gold(II) complexes: Syntheses, molecular structures and substitution reactions with L-cysteine, 
        Inorg. Chim. Acta, 362 (2009) 2595-2602.

    • Stephen O. Ojwach, Ilia A. Guzei, James Darkwa, (Pyrazol-1-ylmethyl)pyridine palladium complexes: Synthesis, 
        molecular structures and activation of small molecules, J. Organomet. Chem. 694 (2009) 1393.

    • R. Malgas, S.F. Mapolie, Stephen O. Ojwach, G.S. Smith, J. Darkwa, Application of Novel Dendritic Nickel Catalysts 
        in the Oligomerization of Ethylene, Catalysis Communications 9 (2008) 1612-1617.

    • Ilia A. Guzei, Lara C. Spencer, Stephen O. Ojwach, James Darkwa Positional disorder manifested as compositional in 
        a pseudo-C2-symmetrical Pd complex, Acta Cryst C64 (2008) m114-m116.

    • Stephen O. Ojwach, Gunnar Westman, James Darkwa, Substituted pyridinylbenzoazole palladium complexes: Synthesis 
        and application as Heck coupling catalysts, Stephen O. Ojwach, Gunnar Westman, James Darkwa, Polyhedron 26 
        (2007) 5544-5552.

    • Stephen O. Ojwach, Ilia A. Guzei, James Darkwa, Selwyn F. Mapolie,Palladium complexes of multidentate 
        pyrazolylmethyl pyridine ligands: Synthesis, Structures and phenylacetylene polymerization, Polyhedron 26 (2007) 851-

    • Stephen O. Ojwach, Lara A. Spencer, Ilia A. Guzei, James Darkwa,Trans-bis[3,5-bis(trifluoromethyl)-1H-
        pyrazoleκN2]dichloropalladium(II) monohydrate, Acta Cryst. C62 (2006) m421-m423.

    • Stephen O. Ojwach, Mmboneni G. Tshivhase, James. Darkwa, Ilia. A. Guzei, Selwyn. F. Mapolie, Furoyl and 
        thiophene carbonyl linker pyrazolyl palladium(II) complexes: synthesis, characterization and evaluation as ethylene 
        oligomerisation catalysts, Can. J. Chem. 83 (2005) 843-853.



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