Formula weight prediction by internal reference diffusion-ordered NMR spectroscopy (DOSY).

Formula weight prediction by internal reference diffusion-ordered NMR spectroscopy (DOSY).
复制标题

DOI:
10.1021/ja810154u
复制
发表时间:
2009-04-22
影响因子:
15
通讯作者:
Williard PG
Williard PG
中科院分区:
化学1区
文献类型:
--
作者:
Li D;Kagan G;Hopson R;Williard PG

文献摘要

参考文献

被引文献

相似文献

分子量信息对于表征活性中间体和有机金属配合物的组成、聚集数和溶剂化状态是重要的。我们描述了一种内参比相关DOSY方法,用于计算未知物种在不同溶剂和不同浓度下的FW。小分子(DIPA)和有机金属络合物(聚集体1)的实施例都产生优异的相关性。同时发现相对扩散速率与溶液粘度变化成反比,这与理论上的Stokes-Einstein方程一致。最小二乘线性预测r2的准确度和FW预测的百分比差异与密度变化直接相关;随着密度的降低,观察到更高的准确度。我们还讨论了成功应用这种内参考相关DOSY方法的指导方针和其他因素。这种实用的方法可以方便地进行修改,并应用于其他未知分子或复合物的表征。
Formula weight information is important to characterize the composition, aggregation number, and solvation state of reactive intermediates and organometallic complexes. We describe an internal reference correlated DOSY method for calculating the FW of unknown species in different solvents with different concentrations. Examples for both the small molecule (DIPA) and the organometallic complex (aggregate 1) yield excellent correlations. We also found the relative diffusion rate is inversely proportional to the viscosity change of the solution, which is consistent with the theoretical Stokes-Einstein equation. The accuracy of the least square linear prediction r2 and the percentage difference of FW prediction are directly related to the density change; greater accuracy was observed with decreasing density. We also discuss the guidelines and other factors for successful application of this internal reference correlated DOSY method. This practical method can be conveniently modified and applied to the characterization of other unknown molecules or complexes.
DOI: 10.1021/ja00252a009
发表时间: 1987-09-02
影响因子: 15
作者:
JACKMAN, LM;SCARMOUTZOS, LM;DEBROSSE, CW
通讯作者: DEBROSSE, CW
DOI: 10.1021/ja01876a032
发表时间: 1939-01-01
期刊: JOUR AMER CHEM SOC
影响因子: --
作者:
FRIEDMAN, LEO;CARPENTER, PAUL G.
通讯作者: CARPENTER, PAUL G.
DOI: 10.1016/j.jmr.2006.12.004
发表时间: 2007-03-01
影响因子: 2.2
作者:
Crutchfield, Christopher A.;Harris, Douglas J.
通讯作者: Harris, Douglas J.
DOI: 10.1021/ja00146a018
发表时间: 1995-10-18
影响因子: 15
作者:
FRAENKEL, G;MARTIN, KV
通讯作者: MARTIN, KV
DOI: 10.1021/ja00067a046
发表时间: 1993-07-14
影响因子: 15
作者:
JACKMAN, LM;CIZMECIYAN, D;NICHOLS, MA
通讯作者: NICHOLS, MA