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with Ph2Si(OH)2 yielded a new molecular aluminopolysiloxane [Al(OH)]4[(Ph2SiO)2O]4, in which there is framework of five annelated eight-membered rings, an Al4(OH)4 eight-membered ring lies in the centre of the structure. The idea of cleavage of cyclic siloxane frameworks by the Lewis acid AlCl3 was applied to the cyclic tetrameric siloxane, in refluxing THF conditions, which resulted in the formation of the spirocyclic aluminosiloxane [Al3{O(Ph2SiO)2}2Cl5]. This is a first example of an unprecedented siloxane ring shrinkage, which has not been reported to date. The spirocyclic aluminosiloxane is also a very promising building block for fabrication of oligomeric and polymeric aluminosilixane structures. On reacting AlCl3 with the silsesquioxane trisilanol ligand a new anionic aluminosilsesquioxane [HNEt3][Al{(cC6H11)7Si7O11(OH)}2] was isolated. This complex contains two unreacted hydroxyl functionalities that makes it particularly attractive as a molecular model for natural alumosilicates (zeolites) and as a precursor for novel hetereometallic metallasilsesquioxanes.

Structures of tris{[(hydroxymethyl)aminomethane]5-bromosalicylideneaminato}diorganotin complexes