Chemistry版 - solid state 29Si NMR of SiO2 用什么internal standard? |
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c*****r
发帖数: 1476 | 1 29Si内标（必须是固体）用来做定量分析。
只要在-70 到 -140 ppm 没有峰就可以。谢谢！ | M**1
发帖数: 162 | 2 不能送元素分析定量吗？
【在 c*****r 的大作中提到】
: 29Si内标（必须是固体）用来做定量分析。
: 只要在-70 到 -140 ppm 没有峰就可以。谢谢！
| c*****r
发帖数: 1476 | 3 定量各种Si-OH
元素分析不管用
【在 M**1 的大作中提到】
: 不能送元素分析定量吗？
| y*****s
发帖数: 1047 | 4 http://en.wikipedia.org/wiki/Chemical_shift#Chemical_shift_refe
The detected frequencies (in Hz) for 1H, 13C, and 29Si nuclei are usually
referenced against TMS (tetramethylsilane) or DSS, which is assigned the
chemical shift of zero. Other standard materials are used for setting the
chemical shift for other nuclei.
DSS is a solid at room temperature | c*****r
发帖数: 1476 | 5 Thanks a lot!
I picked Si(SiMe3)4 (delta, -9.8, -135.5)
【在 y*****s 的大作中提到】
: http://en.wikipedia.org/wiki/Chemical_shift#Chemical_shift_refe
: The detected frequencies (in Hz) for 1H, 13C, and 29Si nuclei are usually
: referenced against TMS (tetramethylsilane) or DSS, which is assigned the
: chemical shift of zero. Other standard materials are used for setting the
: chemical shift for other nuclei.
: DSS is a solid at room temperature
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