Synthesis, characterization, and lactide polymerization activity of group 4 metal complexes containing two bis(phenolate) ligands.
Synthesis, characterization, and lactide polymerization activity of group 4 metal complexes containing two bis(phenolate) ligands.
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含有两个双酚盐配体的第 4 族金属配合物的合成、表征和丙交酯聚合活性
DOI:
10.1021/ic300271h
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发表时间:
2012
影响因子:
4.6
通讯作者:
Mashima
中科院分区:
文献类型:
--
作者:
Buffet;Spaniol;Mashima
A series of group 4 metal complexesZr-(1)2,Zr-(2)2,Zr-(3)2,Zr-(4)2,Zr-(5)2,Hf-(1)2, andHf-(4)2containing two bridged bis(phenolate) ligands of the (OSSO)-type were prepared by the reaction of the corresponding bis(phenol) and group 4 metal precursor MX4(X = OiPr, CH2Ph) and isolated as robust, colorless crystals. NMR spectra indicateD2symmetry, in agreement with the solid state structure determined by single crystal X-ray diffraction study of the complexesZr-(1)2,Hf-(1)2,Zr-(3)2,Zr-(4)2, andZr-(5)2. The complexes with the 1,4-dithiabutanediyl bridged ligands exhibit a highly symmetric coordination around the metal center. The introduction of the rigidtrans-1,2-cyclohexanediyl bridged ligands led to a distorted coordination around the metal center inZr-(4)2andZr-(5)2when theorthosubstituent istert-butyl and theparasubstituent is larger than methyl. The complexesZr-(1)2,Zr-(2)2,Zr-(3)2,Zr-(4)2as well asHf-(1)2andHf-(4)2initiated the ring-opening polymerization ofmeso-lactide at 100 °C to give heterotactic polylactide with pronounced heterotacticity (>70%) and varying polydispersity (1.05 <Mw/Mn< 1.61). As shown by kinetic studies, zirconium complexZr-(1)2polymerizedmeso-lactide faster than the homologous hafnium complexHf-(1)2.
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影响因子:
4.3
作者:
Nomura, Nobuyoshi;Ishii, Ryohei;Kondo, Tadao
通讯作者:
Kondo, Tadao
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Ayellet Stopper;I. Goldberg;M. Kol
通讯作者:
M. Kol
影响因子:
16.6
作者:
Beckerle, Klaus;Manivannan, Ramanujachary;Okuda, Jun
通讯作者:
Okuda, Jun
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
S. Kuppuswamy;I. Ghiviriga;K. Abboud;A. Veige
通讯作者:
A. Veige
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
M. Chisholm;Ewan E. Delbridge
通讯作者:
Ewan E. Delbridge