Hyperfine interactions of narrow-line trityl radical with solvent molecules.

Hyperfine interactions of narrow-line trityl radical with solvent molecules.
复制标题

DOI:
10.1016/j.jmr.2013.04.017
复制
发表时间:
2013-08
影响因子:
2.2
通讯作者:
Martyanov, O. N.
Martyanov, O. N.
中科院分区:
化学3区
文献类型:
--
作者:
Trukhan, S. N.;Yudanov, V. F.;Tormyshev, V. M.;Rogozhnikova, O. Yu.;Trukhin, D. V.;Bowman, M. K.;Krzyaniak, M. D.;Chen, H.;Martyanov, O. N.
关键词:

文献摘要

参考文献

被引文献

相似文献

负责一些动态核极化(DNP)机制的电子核偶极相互作用也负责在CW EPR谱中出现禁止的卫星线,其中电子自旋和核自旋翻转。这样的线所产生的1H核很容易解决在CW EPR测量三苯甲基自由基,一个流行的家庭的DNP试剂。卫星线重叠的一些超精细功能,从13 C在自然丰度的三苯甲基自由基,但它们的强度可以很容易地确定通过简单的模拟EPR光谱使用的超精细参数的三苯甲基自由基。在三苯甲基自由基和/或溶剂的氢中,2 H对1H的同位素取代允许测定来自三苯甲基自由基上的1H和来自溶剂的偶极相互作用。偶极相互作用的强度,在系统中的所有1H上积分,由称为reff的传统参数表征。对于所谓的芬兰三苯甲基在甲醇中,reff值表明,在未标记的溶剂中的1H与芬兰三苯甲基的未配对电子自旋具有比自由基中的1H更强的积分偶极相互作用,因此将是更重要的DNP途径。虽然reff具有距离的维度,但它并不对应于三苯甲基自由基中的任何简单的物理维度,因为未成对电子自旋分布和氢分布的细节在三苯甲基的情况下是重要的。
The electron nuclear dipolar interactions responsible for some dynamic nuclear polarization (DNP) mechanisms also are responsible for the presence formally in CW EPR spectra of forbidden satellite lines in which both the electron spin and a nuclear spin flip. Such lines arising from 1H nuclei are easily resolved in CW EPR measurements of trityl radicals, a popular family of DNP reagents. The satellite lines overlap some of the hyperfine features from 13C in natural abundance in the trityl radical, but their intensity can be easily determined by simple simulations of the EPR spectra using the hyperfine parameters of the trityl radical. Isotopic substitution of 2H for 1H among the hydrogens of the trityl radical and/or the solvent allows the dipolar interactions from the 1H on the trityl radical and from the solvent to be determined. The intensity of the dipolar interactions, integrated over all the 1H in the system, is characterized by the traditional parameter called reff. For the so-called Finland trityl in methanol, the reff values indicate that collectively the 1H in the unlabeled solvent have a stronger integrated dipolar interaction with the unpaired electron spin of the Finland trityl than do the 1H in the radical and consequently will be a more important DNP route. Although reff has the dimensions of distance, it does not correspond to any simple physical dimension in the trityl radical because the details of the unpaired electron spin distribution and the hydrogen distribution are important in the case of trityls.
DOI: 10.1016/j.bpj.2010.05.002
发表时间: 2010-08-04
影响因子: 3.4
作者:
Halevy, Revital;Tormyshev, Victor;Blank, Aharon
通讯作者: Blank, Aharon
DOI: 10.1002/mrm.1910370402
发表时间: 1997-04-01
影响因子: 3.3
作者:
Kuppusamy, P;Wang, PH;Zweier, JL
通讯作者: Zweier, JL
DOI: 10.1039/c002699a
发表时间: 2010-01-01
影响因子: 3.3
作者:
Macholl, Sven;Johannesson, Haukur;Ardenkjaer-Larsen, Jan Henrik
通讯作者: Ardenkjaer-Larsen, Jan Henrik
DOI: 10.1158/1078-0432.ccr-05-0446
发表时间: 2006-07-15
影响因子: 11.5
作者:
Elas, Martyna;Ahn, Kang-Hyun;Halpern, Howard J.
通讯作者: Halpern, Howard J.
DOI: 10.1006/jmre.1998.1568
发表时间: 1998-12-01
影响因子: 2.2
作者:
Astashkin, AV;Kawamori, A
通讯作者: Kawamori, A