New metallasiloxane complexes of aluminium and lanthanides

Abstract

The main objective of this project was to develop novel metalIasiloxane complexes through a variety of synthetic strategies. The work focused mainly on aluminium and lanthanide metallasiloxanes. The catalytic properties of selected metallasiloxanes have been investigated in the terms of they use as molecular models for heterogeneous catalysts and to help illustrate some principles of catalysis. Firstly, investigations of the Interaction of disilanols and trisilanols with amines and Lewis acids were performed (Chapter 2) and resulted in the formation of ionic (pyridinium cation - siloxane anion) salts (HO)Ph2SiOSiPh2O(PyH) (2) and [PyH][{(C6H,11)7Si7O9(OH)2}2O2H] (3) which serve as intermediates in the amine-assisted synthesis of metallasiloxanes. The condensation of Ph2Si(OH)2 in the presence of FeCl3 and pyridine yielded the bispyridinium μ-oxo bis[trichloroferrate(III)]-pyridine, [HPy]2[Fe2Cl6O]Py (4).