Synthesis, Spectral Studies, and Structural Characterization of a New Organosilanetriol, Its Amine Complexes, and a Surface Lewis Basic Cubic Aluminosilicate

The new trichlorosilane 2,6-Et 2 C 6 H 3 N(SiMe 3 )SiCl 3 ( 2 ) on controlled hydrolysis yields 2,6-Et 2 C 6 H 3 N(SiMe 3 )Si(OH) 3 ( 3 ). X-ray diffraction analysis of 3 reveals a rare structure type of aggregation where eight molecules of the silanetriol form an octameric cage through intermolecular O−H···O hydrogen bonding. Reaction of 3 with piperazine (PIP), 4,4‘-bipyridine (BPY), and 1,4-diazabicyclo[2,2,2]octane (DABCO) yields [{2,6-Et 2 C 6 H 3 N(SiMe 3 )Si(OH) 3 }·{PIP}] ( 4 ), [{2,6-Et 2 C 6 H 3 N(SiMe 3 )Si(OH) 3 }·{BPY}] ( 5 ), and [{2,6-Et 2 C 6 H 3 N(SiMe 3 )Si(OH) 3 }·{DABCO}] ( 6 ), respectively. Treatment of 6 with HAl i Bu 2 affords the cubic aluminosiloxane [2,6-Et 2 C 6 H 3 N(SiMe 3 )SiO 3 Al(DABCO)] 4 ·1,4-dioxane ( 7 ). The aluminum centers on the cubic core are coordinated by DABCO molecules in a monodentate fashion.