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Encapsulation of atomic hydrogen into silsesquioxane cages and ESR of encapsulated hydrogen atoms

机译:氢原子在倍半硅氧烷笼中的包封和包封的氢原子的ESR

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Hydrogen atoms are encapsulated in octasilsesquioxane, R(SiO1.5)(8), by irradiation with gamma-rays at room temperature. In deca- and dodecasilsesquioxane, hydrogen atoms are encapsulated by irradiation at 77 K. The thermal decay of the encapsulated hydrogen is well described by a single-exponential function. The excitation energies of the decay are 110-117, 50.4, and 55.6 kJ/mol for the hydrogen atoms in Q(8)M(8), Q(10)M(10), and Q(12)M(12), respectively. The g-values and hyperfine splitting (hfs) constants of the hydrogen atoms in R(SiO1.5)(8) are dependent on the substituents in the corners of the polyhedra, R. The g-values are independent of the temperatures, while the hfs constants increase as the temperature decreases. The g-values of the hydrogen atoms in a large encapsulating cavity decrease with increasing cavity size and approach 2.0023. The temperature dependence of the hfs constants for the hydrogen atoms in Q(10)M(10) or Q(12)M(12) suggests that the hydrogen atoms are localized within the encapsulating cages at low temperatures. [References: 20]
机译:通过在室温下用伽马射线辐照,氢原子被封装在八聚倍半硅氧烷R(SiO1.5)(8)中。在十和十二烷倍半硅氧烷中,氢原子在77 K的辐射下被封装。被封装的氢的热衰减通过单指数函数很好地描述。对于Q(8)M(8),Q(10)M(10)和Q(12)M(12)中的氢原子,衰变的激发能为110-117、50.4和55.6 kJ / mol。 , 分别。 R(SiO1.5)(8)中氢原子的g值和超细分裂常数(hfs)取决于多面体R角上的取代基。g值与温度无关,而hfs常数随温度降低而增加。大的封装腔中氢原子的g值随腔尺寸的增加而降低,并接近2.0023。 Q(10)M(10)或Q(12)M(12)中氢原子的hfs常数对温度的依赖性表明,氢原子位于低温的封装笼中。 [参考:20]

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