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Dr. Nyamato G. Simba Publications

Publications in Journals:

  1. Wekesa A. K; Nyamato, S. G; Kowenje, C; Ojwach, S. O. Coordination behavior and binding properties of 2,6-pyridinedimethanol with Cu(II), Zn(II), and Cd(II) cations. Inorganica Chimica Acta, 2022. https://doi.org/10.1016/j.ica.2022.121042
  2. Nyamato, S. G; Wambugu, K; Kiratu, J; Ojwach, S. O. Liquid-liquid extraction of copper(II), zinc(II), cadmium(II), and lead(II) from aqueous solution and sewage effluent using       phenoxy-amino      ligands.      Water      Science      &     Technology,      2022. https://doi.org/10.2166/wst.2022.164
  3. Wambugu, K;  Nyamato,  S.  G;  Ogunah,  J;  Ojwach,  S.  O.  Phenoxy-imino  ligands: coordination chemistry and binding properties with copper(II) cations. Journal of Coordination Chemistry, 2021. https://doi.org/10.1080/00958972.2021.2015581
  4. Mokaya, T. K; Omosa, L. K; Ogunah, J; Nyamato, S. G. Isolation and Characterization of Secondary Metabolites from Cola minor Stem Extracts. Tropical Journal of Natural Product Research, 2021. http://www.doi.org/10.26538/tjnpr/v5i4.5
  5. Sayo, S.; Kiratu, J.; Nyamato, S. G. Heavy metal concentrations in soil and vegetables irrigated with sewage effluent: A case study of Embu sewage treatment plant, Kenya. Scientific African, 2020. https://doi.org/10.1016/j.sciaf.2020.e00337
  6. Zethu, Z; Nyamato, S. G; Thandeka, A. T; Ojwach, S. O. Palladium(II) complexes of (pyridyl)imine ligands as catalysts for the methoxycarbonylation of olefins. Inorganica Chimica Acta, 2020. https://doi.org/10.1016/j.ica.2019.119270
  7. Jayamani, A; Nyamato, S. G; Ojwach, S. O. Ethylene oligomerization reactions catalyzed by homogeneous and silica immobilized NˆO Fe(II) and Co(II) complexes.Journal of Organometallic Chemistry, 2019, 903 120987.  https://doi.org/10.1016/j.jorganchem.2019.120987
  8. Ngcobo, M.;   Nyamato,   G.   S.;   Ojwach,   S.   O.  Structural   elucidation   of  N^O (ethyliminomethyl)phenol Fe(II) and Co(II) complexes and their applications in ethylene oligomerization catalysis. Molecular Catalysis, 2019, 478, 110590. https://doi.org/10.1016/j.mcat.2019.110590
  9. Magubane, M. N.; Nyamato, G. S.; Ojwach, S. O.; Munro, O. Q. Structural, kinetic, and DFT studies of the transfer hydrogenation of ketones mediated by (pyrazole)pyridine iron(II) and nickel(II) complexes. RSC Adv., 2016, 6, 65205–65221. https://doi.org/10.1039/C6RA12788F
  10. Nyamato, G. S.; Ojwach, S. O.; Akerman, M. P. Ethylene oligomerization studies by nickel(II) complexes  chelated  by (amino)pyridine  ligands:  experimental  and  density functional theory studies. Dalton Trans., 2016, 45, 3407-3416. https://doi.org/10.1039/C5DT04667J
  11. Nyamato, G. S.; Alam, M. G., Ojwach, S. O.; Akerman, M. P. Nickel(II) complexes bearing pyrazolylpyridines:   synthesis,   structures   and   ethylene   oligomerization reactions. Appl. Organometal. Chem., 2016, 30, 89-94. https://doi.org/10.1002/aoc.3402
  12. Nyamato, G. S.; Ojwach, S. O.; Akerman, M. P. Potential hemilabile (imino)pyridine palladium(II) complexes as selective ethylene dimerization catalysts: An experimental and theoretical approach. Organometallics 2015, 34, 5647-5657. https://doi.org/10.1021/acs.organomet.5b00860
  13. Nyamato, G.  S.;  Alam,  M.  G.;  Ojwach,  S.  O.;  Akerman,  M.  P.  (Pyrazolyl)- (phosphinoyl)pyridine iron(II), cobalt(II) and nickel(II) complexes: Synthesis, characterization and ethylene oligomerization studies. Journal of Organometallic Chemistry 2015, 783, 64-72. https://doi.org/10.1016/j.jorganchem.2015.02.015
  14. Nyamato, G. S.; Ojwach, S. O.; Akerman, M. P. Unsymmetrical (pyrazolylmethyl)- pyridine metal complexes as catalysts for ethylene oligomerization reactions: Role of solvent and co-catalyst in product distribution. Journal of Molecular Catalysis A: Chemical 2014, 394, 274–282. https://doi.org/10.1016/j.molcata.2014.07.018
  15. Nyamato, G. S.; Ojwach, S. O.; Akerman, M. P. Packing forces in dichloridobis(3,5- diphenyl-1H-pyrazole-kN2)cobalt(II) dichloromethane hemisolvate. Acta Cryst. 2014, C70, 780-783. https://doi.org/10.1107/S2053229614015411
  16. Njoroge, M. W.; Ojwach, S. O.; Nyamato, G. S.; Omondi, B.; Darkwa, J. Coordination behavior and binding properties of (3,5-dimethyl-1H-pyrazol-1-yl)ethanol with Cu(II), Zn(II), Cd(II), and Pb(II) metals. Journal of Coordination Chemistry 2013, 66:9, 1626- https://doi.org/10.1080/00958972.2013.784904
  17. Ojwach,   S.   O.;   Nyamato,   G.   S.;   Omondi,   B.;   Darkwa,   J.;   Okoth,   A.   O. Multidentatebis(pyrazolylmethyl)pyridine ligands: coordination chemistry and binding properties with zinc(II) and cadmium(II) cations. Journal of Coordination Chemistry 2012, 65:2, 298-307. https://doi.org/10.1016/j.ica.2012.07.005
  18. Ojwach, S. O.; Nyamato, G. S.; Omondi, B.; Darkwa, J.; Okoth, A. O.  Chelating (pyrazolylmethyl)pyridine ligands: Coordination chemistry and binding properties with zinc(II) and cadmium(II) cations.  Inorganica Chimica Acta 2012, 392, 141–147. https://doi.org/10.1016/j.ica.2012.07.005

REVIEWED CONFERENCE PAPER

  1. Nyamato, S. G; Ojwach, S. O. Solvent extraction of zinc(II), cadmium(II) and lead(II) cations from wastewater using synthetic chelating ligands. In Modern and Traditional Methods of Water Resource Management in Africa by M. Muhadir (Ed). Pp 151-163, ISBN: 9783736970410 (Print) 9783736960411 (online) Cuvillier.de

Presentation of Papers at Academic and Professional Conferences

  1. George S. Nyamato and Stephen O. Ojwach, The 31st Catalysis Society of South Africa Conference, 7th-10th  November 2021, Nickel(II) complexes as catalysts for ethylene oligomerization reactions.
  2. George S. Nyamato, School of Pure and Applied Sciences Conference, University of Embu, 2nd June-3rd June 2021, Extraction of heavy metals from water using chelating ligands.
  3. George S. Nyamato and Stephen O. Ojwach, Durban, South Africa, 5th May-9th May 2019, Solvent extraction of zinc(II), cadmium(II) and lead(II) cations from wastewater using synthetic chelating ligands.
  4. George S. Nyamato and Stephen O. Ojwach, 43rd SACI National Convention 2018, CSIR-ICC in Pretoria, South Africa, 2nd - 7th December 2018, Ethylene oligomerization studies by nickel(II) complexes chelated by (amino)pyridine ligands.
  5. George S. Nyamato, Stephen O. Ojwach and Matthew P. Akerman,  9th International KCS conference, United States International University-Africa, Nairobi, 9th May -12th May 2017, Iminopyridine Palladium(II) Complexes: Synthesis, Characterization, DFT Studies and Precursors for Ethylene Oligomerization.
  6. George S. Nyamato, Stephen O. Ojwach and Matthew P. Akerman,  SACI INORG 2015, Rhodes University, South Africa, 28th June -2nd July 2015, (Imino)pyridine palladium(II) complexes: Experimental, theoretical studies and as ethylene oligomerization catalysts.

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