Coordination chemistry of the activation of [(triazacyclohexane)CrCl3] with [PhNMe2H][B(C6F5)4] and AlR3

Reaction of 1,3,5‐Triazacyclohexanes with TiCl4: Formation of Cationic Complexes

“…The structures are very similar to the neutral [(R 3 TAC)CrCl 3 ] where the analogous structure for R = PhCH 2 CH 2 is known. [5] However, the Ti-N bond (2.23 Å) is much longer than in the chromium complex (2.10 Å) whereas the Ti-Cl bonds (2.20 Å) are shorter than in the chromium complex (2.28 Å), despite nearly identical ionic radii for Cr III and Ti IV . [11] Thus the higher charge on titanium favours the chloride bonding over the amine bonding.…”

“…B in Scheme 1) are highly active homogeneous catalysts for the polymerisation and selective trimerisation of olefins. [5] Recently alternative catalysts for the selective trimerisation of ethylene based on aryl-substituted CpTiCl 3 , C, have been discovered. [6] Since many features of the metal complexes containing R 3 TAC, such as the ring centroid-metal distance, donor orbital orientation or positions of the ring substituents resemble those of analogous Cp rather than triazacyclononane complexes, we were interested in the preparation of analogous [(R 3 TAC)TiCl 3 ] + complexes.…”

Recent Research Progress in Preparation of Ethylene Oligomers with Chromium-Based Catalytic Systems

“…Ethylene oligomerization results obtained with bis(imine)thiazole-based catalysts [13] Entry Catalyst Co-catalyst a t Product Activity PE Total The catalysts can be activated with MAO and [ [27,28]. With different substituents, the catalysts can polymerize or selectively trimerize ethylene.…”

“…Activities of up to 800 kg/mol Cr per h with MAO and up to 2800 kg/mol Cr per h with DMAB/Al l Bu 3 can be obtained. It was found that chromium is reduced to the oxidation state +I during the catalysis [27]. [3].…”

SiO2/Cr monolayers and formation of polyethylene films

“…1,3,5-tribenzylhexahydro-1,3,5-triazine-CrCl 3 (TAC-CrCl 3 ) and Stöber silica particles with a diameter of 500 nm (sSiO 2 ) were prepared according to the literature procedures [18][19][20][21]. Different amounts of TAC-CrCl 3 were dissolved in 50 ml chloroform.…”