A mesoporous titanosilicate lacking titanol groups has been prepared by exhaustive OH silylation and characterized by 29 Si NMR, by XANES, and by its catalytic activity for cyclohexene epoxidation. Through a comparison of the luminescence of this silylated Ti−MCM-41 titanosilicate with that of the original Ti−MCM-41 before and after calcination, firm experimental support that an emission band appearing at λ max = 390 nm is due to the tetrapodal framework Ti(OSi⋮) 4 is provided.
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Corma et al. (2000) studied this question.