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

• Main Author: Abdullah, Che Ibrahim
• Format: Thesis
• Published: 2014
• Subjects: Q Science (General); QD Chemistry
• Online Access: http://studentsrepo.um.edu.my/4882/14/COVER_%2D_(CHE_IBRAHIM_BIN_ABDULLAH_%2D_KIMIA_SGR).pdf; http://studentsrepo.um.edu.my/4882/15/Form%2D_Original_Literary_Work_Declaration.pdf; http://studentsrepo.um.edu.my/4882/1/1._Acknowledgement.pdf; http://studentsrepo.um.edu.my/4882/2/2._Abstract.pdf; http://studentsrepo.um.edu.my/4882/3/3._Content.pdf; http://studentsrepo.um.edu.my/4882/4/4._List_of_Table.pdf; http://studentsrepo.um.edu.my/4882/5/5._List_of_Figure.pdf; http://studentsrepo.um.edu.my/4882/6/6._List_of_Scheme.pdf; http://studentsrepo.um.edu.my/4882/7/7._List_of_Symbol_and_Abreviation.pdf; http://studentsrepo.um.edu.my/4882/8/8._Chapter_One.pdf; http://studentsrepo.um.edu.my/4882/9/9._Chapter_Two.pdf; http://studentsrepo.um.edu.my/4882/10/10._Chapter_Three.pdf; http://studentsrepo.um.edu.my/4882/11/11._Chapter_Four.pdf; http://studentsrepo.um.edu.my/4882/12/12._Chapter_Five.pdf; http://studentsrepo.um.edu.my/4882/13/13._Appendix.pdf; http://studentsrepo.um.edu.my/4882/

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).