Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters
博士 === 國立中興大學 === 化學系所 === 101 === A series of zinc benzylalkoxide complexes, magnesium benzylalkoxide complexes, and aluminum methyl complexes supported by NNO-tridentate pyrazolonate ligands with various electron withdrawing -donating subsituents have been synthesized and characterized. X-ray crys...
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ndltd-TW-101NCHU50650052016-07-31T04:21:08Z http://ndltd.ncl.edu.tw/handle/98437671251489688661 Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters 吡唑啉酮金屬化合物之製備及其在環酯類開環聚合反應上之應用 Hui-Ju Chuang 莊惠如 博士 國立中興大學 化學系所 101 A series of zinc benzylalkoxide complexes, magnesium benzylalkoxide complexes, and aluminum methyl complexes supported by NNO-tridentate pyrazolonate ligands with various electron withdrawing -donating subsituents have been synthesized and characterized. X-ray crystal structural studies and PGSE experimental revealed that complexes 1a, 2a, 5a, 1b, 2b, 4b and 5b are dinuclear bridging through the benzylalkoxy oxygen atoms with penta-coordinated metal centers. However, the aluminum complex 1c exhibits a monomeric feature with a tetra-coordinated Al center different from the penta-coordinated aluminum complex 4c. Based on kinetic studies, the activity of the magnesium complexes is significantly influenced by the electronic effect of the ancillary ligands with the electron-donating substituents at the phenyl rings enhancing the polymerization rate. All the zinc and magnesium complexes have acted as efficient initiators for the ring-opening polymerization of L-lactide. The ring-opening polymerization (ROP) of caprolactone, decalactone,butyrolactone and their copolymer with complexes 1a and 1b were investigated. It is interesting to note that aluminum complexes bearing O,N,N,O-tetradntate ligand are excellent efficient initiators for the ring-opening polymerization of caprolactone. 林助傑 2013 學位論文 ; thesis 148 zh-TW |
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博士 === 國立中興大學 === 化學系所 === 101 === A series of zinc benzylalkoxide complexes, magnesium benzylalkoxide complexes, and aluminum methyl complexes supported by NNO-tridentate pyrazolonate ligands with various electron withdrawing -donating subsituents have been synthesized and characterized. X-ray crystal structural studies and PGSE experimental revealed that complexes 1a, 2a, 5a, 1b, 2b, 4b and 5b are dinuclear bridging through the benzylalkoxy oxygen atoms with penta-coordinated metal centers. However, the aluminum complex 1c exhibits a monomeric feature with a tetra-coordinated Al center different from the penta-coordinated aluminum complex 4c. Based on kinetic studies, the activity of the magnesium complexes is significantly influenced by the electronic effect of the ancillary ligands with the electron-donating substituents at the phenyl rings enhancing the polymerization rate. All the zinc and magnesium complexes have acted as efficient initiators for the ring-opening polymerization of L-lactide. The ring-opening polymerization (ROP) of caprolactone, decalactone,butyrolactone and their copolymer with complexes 1a and 1b were investigated. It is interesting to note that aluminum complexes bearing O,N,N,O-tetradntate ligand are excellent efficient initiators for the ring-opening polymerization of caprolactone.
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林助傑 |
author_facet |
林助傑 Hui-Ju Chuang 莊惠如 |
author |
Hui-Ju Chuang 莊惠如 |
spellingShingle |
Hui-Ju Chuang 莊惠如 Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters |
author_sort |
Hui-Ju Chuang |
title |
Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters |
title_short |
Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters |
title_full |
Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters |
title_fullStr |
Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters |
title_full_unstemmed |
Preparation of Metal Pyrazolonate Complexes: Efficient Initiators for the Ring-Opening Polymerization of Cyclic Esters |
title_sort |
preparation of metal pyrazolonate complexes: efficient initiators for the ring-opening polymerization of cyclic esters |
publishDate |
2013 |
url |
http://ndltd.ncl.edu.tw/handle/98437671251489688661 |
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