SYNTHESIS OF CROMI UM PHENOXYIMI N COMPLEXES AS CANDIDATE CATALYST OF ETHYLENE TRIMERIZATION REACTION BECOMES 1-HEXENE

• Main Author: Arifin, Zainal
• Format: Theses
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/32755
• Institution: Institut Teknologi Bandung

1-Hexena is used as a co-monomer in LLDPE (Linear Low Density Polyethylene) productions. 1-Hexane is sy nthesized through trimerization of ethylene using a metal catalyst and co-catalyst of MAO (methylaluminooxane) in large amount. This research aims to design and synthesize phenoxyimine complexes as catalysts in ethy lene trimerization reaction in the absence of MAO. Key catalytic steps in ethy lene trimerization require electronic and steric controls on ligands and metal in the complex. A selected chromium metal center of a catalyst has also to possess several oxidation state and high electrop hilcity to be easily accessed and coordinated by ethylene as the monomer. Phenoxyimine ligands were chosen due to its capability to direct the coordinated ethylene in cis position. Various ligands have been successfully sy nthesized and characterized by FTIR (? = 1617 (a); 1618 (b); 1617 (c); 1617 (d); 1620 (e); 1616 (f) cm-1), 1H and 13C NMR ( ? = 8,72 dan 163,9 (a); 8,73 dan 166,02 (b); 8,67 dan 166,36 (c); 8,64 dan 165,38 (f) ppm). The crystals of ligand structure were also confirmed using single crystal x-ray diffraction (SC-XRD). Cr were chosen in the sy nthesis of metal complexes and characterized by FTIR. Catalytic tests were performed in situ using CrCl3(THF)3 complex, phenoxyimine ligand in the presence of Aluminium tris(sec-butoxide), triethylamine, H2 (2 Bar), and ethy lene (10 Bar). The gas chromatography analysis showed a likely 1-hexene peak in the retention time of 4,447 minutes.