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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Through-bond and through-space connectivities of amorphous aluminophosphate by two-dimensional Al-27-P-31 heteronuclear NMR
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Through-bond and through-space connectivities of amorphous aluminophosphate by two-dimensional Al-27-P-31 heteronuclear NMR

机译：二维Al-27-P-31异核NMR表征无定形铝磷酸盐的键合和空间连通性

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摘要

The connectivities between Al and P through chemical bond and internuclear distance have been studied for an amorphous alumino-phosphate (a-AlPO4) using two-dimensional (213) solid-state Al-27-P-31 correlation NMR (MAS J-HMQC and CP HETCOR). Whereas the conventional P-31 MAS spectrum provides less informative results because of poor resolution caused by large distributions of the nucleus surroundings, the 2D HETCOR shows much better resolution and at least four non-equivalent P sites in the a-AlPO4. These P sites are found to be correlated with one Al-[4], two Al-[5] and one Al-[6] species, and have different chemical shifts. This result might indicate that the mean P-O-Al-[n] (n = 4,5,6) bond angles are different each other, and they are estimated using the relationship with the P-31 chemical shifts in crystalline AlPO4 previously reported. 2007 Elsevier B.V. All rights reserved.
机译：已使用二维（213）固态Al-27-P-31相关NMR（MAS J-HMQC）研究了无定形铝磷酸盐（a-AlPO4）通过化学键和核间距离在Al和P之间的连接性和CP HETCOR）。常规P-31 MAS光谱由于原子核周围环境分布大而导致的分辨率差而提供的信息较少，而2D HETCOR显示出更好的分辨率，并且在α-AlPO4中具有至少四个非等价的P位。发现这些P位与一种Al- [4]，两种Al- [5]和一种Al- [6]相关，并且具有不同的化学位移。该结果可能表明平均P-O-Al- [n]（n = 4,5,6）键角互不相同，并且使用与先前报道的晶体AlPO4中P-31化学位移的关系来估算。 2007 Elsevier B.V.保留所有权利。

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