Crystallographic characterisation of novel Zn(II) silsesquioxane complexes and their application as initiators for the production of polylactide |
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| Authors: | Matthew D Jones Callum G Keir Andrew L Johnson Mary F Mahon |
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| Institution: | 1. Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK;2. Bath Chemical Crystallography Unit, Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK |
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| Abstract: | Herein, the solid state structures of the products from the reaction of the silsesquioxane triol (iso-C4H9)7Si7O12(OH)3 (1) with two equivalents of ZnMe2 in both THF and toluene are reported. In both cases tetrametallic Zn(II) complexes were isolated, with toluene (iso-C4H9)7Si7O12]2Zn4Me2 (2) was prepared while performing the reaction in THF the analogous complex (iso-C4H9)7Si7O12]2Zn4Me2(THF)2 (3) was formed. Both species have also been characterised via1H, 13C{1H} and 29Si{1H} NMR spectroscopy, which confirm the solid state structures are maintained in solution. Both 2 and 3 show modest activities for the polymerisation of rac-lactide and a heterogeneous catalyst has also been prepared. |
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| Keywords: | Silsesquioxane Zinc Crystallography Polylactide |
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