Synthesis of some chromium (III) complexes and the use of these complexes as catalyst for the polymerization of alpha-olefins / Che Ibrahim bin Abdullah

Author

Che Ibrahim Abdullah

Date of Award

1-1-2014

Thesis Type

masters

Document Type

Thesis

Divisions

science

Department

Department of Chemistry, Faculty of Science

Institution

University of Malaya

Abstract

A series of chromium(III) and chromium(III)-iron(III) carboxylate complexes were prepared by heating common chromium(III) and Iron(III) salts in carboxylic acids. The structure of these complexes has been confirmed by X-ray crystallography to give a trinuclear oxo-centred carboxylate. The characterization of complexes was carried out by UV-visible spectroscopy, IR spectroscopy, Thermal analysis (TGA), CHN-elemental analysis and metal content analysis. The complexes contain a triangular arrangement of metal ions connected by a central μ3-oxo atom and bridged with six carboxylate ligands. Each carboxylate anion spans two metal centres at the periphery of the [M3(μ3-O)]6+ core, while H2O ligands occupy the remaining coordination sites on each metal centre to form a coordinated H2O. The coordination around the metal centre is approximately octahedral. These complexes with combination of diethylaluminium chloride as a cocatalyst were used in the polymerization of ethylene to form a heterogeneous catalyst system. The polymerization of ethylene was performed by varying the Al/Cr molar ratio, temperature and changing the catalyst complexes. Kinetic data show that the polymerization of ethylene is a first order reaction. The polymerization of ethylene was modified by introducing SMRCV (natural rubber) into the polymerization system. The polymer produced was characterized by using ATR-IR spectroscopy, TGA, powder XRD and differential scanning calorimetric (DSC).

Note

Dissertation (M.Sc.) -- Department of Chemistry, Faculty of Science, University of Malaya, 2014.

Recommended Citation

Abdullah, Che Ibrahim, "Synthesis of some chromium (III) complexes and the use of these complexes as catalyst for the polymerization of alpha-olefins / Che Ibrahim bin Abdullah" (2014). Student Works (2010-2019). 2398.
https://knova.um.edu.my/student_works_2010s/2398