The infrared spectra of dried products (Figure ) are dominated by the strong vibration bands at 1139 and 1035 cm -1 assigned to the intra-cage νas(Si-O-Si) and the extra-cage νas(Si-O-Al) linkages of the CUBE, respectively. The vibration bands at 1402, 2919, and 2990 cm - 1 are also common to all the prepared samples and primarily assigned to the bending and valence vibrations δas(CH3), νs(CH3), νas(CH3) of the residual -SnMe3 groups. Additional bands, corresponding to the valence/bending vibrations of the ethyl substituents of Et 3 N (1470 cm -1 ) and TEPO (1460, 2890, and 2942 cm -1 ), as well as the δ as (CH 3 ) vibrations of