Cage and ladder structures of silsesquioxanes characterized by UV-MALDI-TOF mass spectrometry

【摘要】 <正> The molar mass distribution of SSO in the first generation derived from the hydrolytic condensation of two trialkoxysilanes, [3- （Methacryloxy） propyl] trimethoxysilane （MPMS） and vinyltrimethoxysilane （VMS）, are determined by UV-MALDI-TOF MS. The comparisons of theoretical masses with experimental masses are calculated using the proposed compounds, which are assigned to formulas Tn （OH）_m, T_n （OMe）_y or T_n（OH）_x（OMe）_y[T=RSiO_{1.5-（x+y）/2n}, R=——（CH₂）₃OOCCH（CH₃）CH₂ and——CHCH₂]. Both the proposed cage and ladder structures of SSO derived from similar sol-gel process of monomers are illustrated. The causes for the difference in structures between SSO_M and SSO_v is discussed as well.更多还原

【Abstract】 The molar mass distribution of SSO in the first generation derived from the hydrolytic condensation of two trialkoxysilanes, [3- （Methacryloxy） propyl] trimethoxysilane （MPMS） and vinyltrimethoxysilane （VMS）, are determined by UV-MALDI-TOF MS. The comparisons of theoretical masses with experimental masses are calculated using the proposed compounds, which are assigned to formulas Tn （OH）_m, T_n （OMe）_y or T_n（OH）_x（OMe）_y[T=RSiO_{1.5-（x+y）/2n}, R=——（CH₂）₃OOCCH（CH₃）CH₂ and——CHCH₂]. Both the proposed cage and ladder structures of SSO derived from similar sol-gel process of monomers are illustrated. The causes for the difference in structures between SSO_M and SSO_v is discussed as well.更多还原