Olsen K K, Zwanziger J W
Department of Chemistry, Indiana University, Bloomington 47405, USA.
Solid State Nucl Magn Reson. 1995 Oct;5(1):123-32. doi: 10.1016/0926-2040(95)00035-o.
The results of a multi-nuclear nuclear magnetic resonance (NMR) study of (AgI)x(Ag2O)y(P2O5)1-x-y glasses are reported. Using the two-dimensional variable-angle correlation spectroscopy experiment, the isotropic and anisotropic chemical shift interactions of phosphorus were determined as a function of silver iodide and silver oxide composition. From these measurements we determine the average conformation of the phosphate groups. In addition, the 109Ag NMR spectra were recorded, as a function of both composition and temperature. At high silver oxide concentrations, interaction between the silver and phosphate groups has been detected, but in glasses in the series the (AgPO3)x(AgI)1-x 31P NMR is strikingly independent on the silver iodide composition. The temperature dependence of the silver NMR linewidths in these systems shows clearly the silver mobility, and at lower temperatures no evidence for multiple distinct silver binding sites was observed. The silver chemical shift is strongly dependent on both composition and temperature. The former effect is interpreted in terms of the influence on the chemical shift of binding to oxygen versus iodine.
报道了对(AgI)x(Ag2O)y(P2O5)1-x-y玻璃进行的多核核磁共振(NMR)研究结果。通过二维可变角度相关光谱实验，确定了磷的各向同性和各向异性化学位移相互作用与碘化银和氧化银组成的函数关系。通过这些测量，我们确定了磷酸基团的平均构象。此外，记录了109Ag NMR光谱，作为组成和温度的函数。在高氧化银浓度下，已检测到银与磷酸基团之间的相互作用，但在该系列玻璃中，(AgPO3)x(AgI)1-x的31P NMR对碘化银组成的依赖性非常显著。这些体系中银NMR线宽的温度依赖性清楚地显示了银的迁移率，并且在较低温度下未观察到多个不同银结合位点的证据。银化学位移强烈依赖于组成和温度。前一种效应是根据与氧和碘结合对化学位移的影响来解释的。
