期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 5, 页码 635-642出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200801049
关键词
Zinc; Polylactide; Heterogeneous catalysis; Homogeneous catalysis; N,O ligands
资金
- Engineering and Physical Sciences Research Council
- University of Bath
- Engineering and Physical Sciences Research Council (EPSRU)
- EPSRC [EP/D077532/1] Funding Source: UKRI
Schiff base ligands (L1H-L8H) have been prepared and complexed to Zn-II centres. All eight complexes have been characterised by single-crystal X-ray diffraction methods, multinuclear NMR spectroscopy and elemental analysis. It was shown that for L1H and L2H trimetallic complexes of the form Zn-3(OAc)(4)(L1-2)(2) were isolated. However, for L3H to L7H monometallic complexes were formed, Zn(L3-7)(2). For L8H a trimetallic complex was also isolated with the same stoichiometry its Zn-3(OAc)(4)(L1-2)(2) but a different coordination motif Was detected. The Schiff base ligand L1H was anchored to silica and treated with Zn(OAc)(2)center dot 2H(2)O to form the heterogeneous Zn-II system. This was characterised by C-13{H-1} CP/MAS NMR spectroscopy. All homogeneous and heterogeneous catalysts were assessed for the ring-opening polymerisation of rac-lactide at 130 degrees C in the absence of solvent, using unsublimed monomer. All catalysts offered good conversions and a moderate degree of control. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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