کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1339512 | 979707 | 2010 | 5 صفحه PDF | دانلود رایگان |

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.
The crystal structures of two novel Zn(II) silsesquioxane complexes are reported together with the free trisilanol. The complexes have a unique tetrametallic Zn(II) core, with almost perpendicular four membered Zn2O2 rings. The outer zinc atoms have a coordinated methyl group. These complexes and a heterogeneous catalyst have been trialled for the polymerisation of rac-lactide.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 29, Issue 1, 13 January 2010, Pages 312–316