van Wüllen L, Müller-Warmuth W
Institut für Physikalische Chemie, Westfälischen Wilhelms-Universität, Münster, Germany.
Solid State Nucl Magn Reson. 1993 Oct;2(5):279-84. doi: 10.1016/0926-2040(93)90009-c.
11B MAS NMR spectroscopy has been shown to deliver reliable parameters for the chemical shift and the quadrupole interaction in glasses if short excitation pulses, high-speed magic angle spinning and satellite transition spectroscopy are applied. It is possible, in particular, to separate the contributions for trigonal BO3 and tetrahedral BO4 units to determine the relative fractions of both, and to use the isotropic chemical shift values as a sensitive probe for the nearest and next nearest environments of the boron atoms. The potential of the method has been demonstrated for some borate and borosilicate glasses prepared by the alkoxide gel techniques.
如果应用短激发脉冲、高速魔角旋转和卫星跃迁光谱，11B 核磁共振波谱已被证明可为玻璃中的化学位移和四极相互作用提供可靠参数。特别是，可以分离出三角 BO3 和四面体 BO4 单元的贡献，以确定两者的相对比例，并将各向同性化学位移值用作硼原子最近和次近环境的灵敏探针。该方法的潜力已在一些通过醇盐凝胶技术制备的硼酸盐和硼硅酸盐玻璃中得到证明。
