Hetero-bimetallic alkali titanosilicates [MOTi{OSi(O^tBu)₃}₃]₂ (M = Li-Cs) with terminal Ti-O^- groups

The molecular titanosilicate (((BuO3)-Bu-t)(3)SiO](3)TiNEt2 (1) was obtained from the reaction between silanol ((BuO3)-Bu-t)(3)SiOH and titanium amide Ti(NEt2)(4). The reaction of 1 with alkali metal hydroxides MOH (M = Li, Na, K, Rb, Cs) offers a straightforward route to the alkaline salts of titanosilicates (MOTi{OSi((OBu)-Bu-t)(3)}(3)](2) with a terminal Ti-O moiety. All compounds were characterised by single-crystal X-ray diffraction studies. Hirshfeld atom refinement and QTAIM analysis of the electron density in 1 and in the Rb salt 5 revealed the D-A nature of the Ti-O and Ti-N bonds and the presence of agostic C-H center dot center dot center dot Rb interactions.