Sudhakar, Padmanabhan and Amburose, Valan C and Sundararajan, Govindarajan and Nethaji, Munirathinam (2004) A New Class of Mono- and Tetra-nuclear Titanatranes: Synthesis, Structure, and Ethylene Polymerization Studies. Role of Single-Sited Active Species? In: Organometallics, 23 (19). pp. 4462-4467.
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Mono- and tetranuclear titanatranes bearing the $C_3$-symmetric aminotriol ligand $N(CH2CHPhOH)_3$ were synthesized. The structure of the tetratitanium compound was determined by single-crystal X-ray crystallography. The new titanatrane derivative included four aminotriols ligated to four titanium atoms, forming a tetranuclear unit with \mu$_2-O$ and \mu$_3-O$ bridges. The mono- and tetranuclear titanatranes were capable of polymerizing ethylene with a turnover frequency of up to 375 kg of PE/((mol of catalyst) h bar). The polymers obtained had $T_m \approx$ 133 C, indicative of linear polyethylene, and were further characterized by NMR. The ethylene polymerization activities of mono- and tetranuclear titanium catalysts were related by a factor of 4, indicating possibly the formation of a common single-site active species.
|Item Type:||Journal Article|
|Additional Information:||Copyright for this article belongs to American Chemical Society.|
|Department/Centre:||Division of Chemical Sciences > Inorganic & Physical Chemistry|
|Date Deposited:||23 Dec 2004|
|Last Modified:||17 Jan 2012 10:00|
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