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Your search keyword '"Chen, Hsuan-Ying"' showing total 10 results
Start Over Author "Chen, Hsuan-Ying" Journal inorganic chemistry
10 results on '"Chen, Hsuan-Ying"'

4. Reactivity Study of Unsymmetrical β-Diketiminato Copper(I) Complexes: Effect of the Chelating Ring

Author

Chuang, Wan-Jung, primary, Hsu, Sung-Po, additional, Chand, Kuldeep, additional, Yu, Fu-Lun, additional, Tsai, Cheng-Long, additional, Tseng, Yu-Hsuan, additional, Lu, Yuh-Hsiu, additional, Kuo, Jen-Yu, additional, Carey, James R., additional, Chen, Hsuan-Ying, additional, Chen, Hsing-Yin, additional, Chiang, Michael Y., additional, and Hsu, Sodio C. N., additional

Published
2017
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10. Synthesis and structural studies of heterobimetallic alkoxide complexes supported by bis(phenolate) ligands: efficient catalysts for ring-opening polymerization of L-lactide.

Author

Chen HY, Liu MY, Sutar AK, and Lin CC

Subjects
Catalysis, Models, Molecular, Molecular Structure, Phenols chemical synthesis, Polyesters chemical synthesis, Dioxanes chemistry, Phenols chemistry, Titanium chemistry
Abstract

A series of heterobimetallic titanium(IV) complexes [LTi(O(i)Pr)(mu-O(i)Pr)(2)Li(THF)(2)], [LTi(O(i)Pr)(mu-O(i)Pr)(2)Na(THF)(2)], [LTi(mu-O(i)Pr)(2)Zn(O(i)Pr)(2)], and [LTi(mu-O(i)Pr)(2)Mg(O(i)Pr)(2)] (where L = bidentate bisphenol ligands) have been synthesized and characterized including a structural determination of [L(1)Ti(mu(2)-O(i)Pr)(2)(O(i)Pr)Li(THF)(2)] (1a). These complexes were investigated for their utility in the ring-opening polymerization (ROP) of l-lactide (LA). Polymerization activities have been shown to correlate with the electronic properties of the substituent within the bisphenol ligand. In contrast to monometallic titanium initiator 1e, all the heterobimetallic titanium initiators (Ti-Li, Ti-Na, Ti-Zn, and Ti-Mg) show enhanced catalytic activity toward ring-opening polymerization (ROP) of l-LA. In addition, the use of electron-donating methoxy or methylphenylsulfonyl functional ligands reveals the highest activity. The bisphenol bimetallic complexes give rise to controlled ring-opening polymerization, as shown by the linear relationship between the percentage conversion and the number-average molecular weight. The polymerization kinetics using 2c as an initiator were also studied, and the experimental results indicate that the reaction rate is first-order with respect to both monomer and catalyst concentration with a polymerization rate constant, k = 81.64 M(-1) min(-1).

Published
2010
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