h********y 发帖数: 287 | 1 想测1/T1和顺磁性物质的线性关系。有几个问题想请教:
1.我用的是D2O, 文献用的顺磁性物质是K3Cr(CN)6,不知道K3Fe(CN)6可以不?或者其它
的Cr3+的化合物,比如Cr(NO3)3
2.如何减小T1的误差? 我试着测量了几次,发向由于误差太大,T1随浓度的改变和误
差的大小接近,甚至有个t1反而增加了。
3.有没有相关的书或者文献可以参考?请推荐。
万分感谢! | b*******r 发帖数: 1073 | 2
One can "tune" the paramagnetic effects on T1 by changing the paramagnetic
agents (some agents give stronger transverse PRE while some others give
smaller T1 PRE but stronger other effects). Which agent to use I guess
depends on your goals and other practical considerations like availability,
solubility, toxicity, or whatever.
1. Repeatable sample preparation
(also, increase the difference in spin concentrations to magnify the effect
?)
2. NMR measurement
(D1 should be long enough, delays s
【在 h********y 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 想测1/T1和顺磁性物质的线性关系。有几个问题想请教: : 1.我用的是D2O, 文献用的顺磁性物质是K3Cr(CN)6,不知道K3Fe(CN)6可以不?或者其它 : 的Cr3+的化合物,比如Cr(NO3)3 : 2.如何减小T1的误差? 我试着测量了几次,发向由于误差太大,T1随浓度的改变和误 : 差的大小接近,甚至有个t1反而增加了。 : 3.有没有相关的书或者文献可以参考?请推荐。 : 万分感谢!
| g*****n 发帖数: 36 | 3 Experiments' Dealy should be long enough.
You probably could find some useful information here
http://www.chinanmr.cn/forum.php
or
http://www.nmrwiki.cn | h********y 发帖数: 287 | 4 Thanks! 下周开始再重复测量几次看看。
,
effect
you
【在 b*******r 的大作中提到】![](/moin_static193/solenoid/img/up.png) : : One can "tune" the paramagnetic effects on T1 by changing the paramagnetic : agents (some agents give stronger transverse PRE while some others give : smaller T1 PRE but stronger other effects). Which agent to use I guess : depends on your goals and other practical considerations like availability, : solubility, toxicity, or whatever. : 1. Repeatable sample preparation : (also, increase the difference in spin concentrations to magnify the effect : ?) : 2. NMR measurement
|
|