A magic-angle-spinning NMR method for 1H-1H distance measurement using coherent polarization transfer in 13C-labeled organic solids.
A magic-angle-spinning NMR method for 1H-1H distance measurement using coherent polarization transfer in 13C-labeled organic solids.
复制标题
一种利用 13C 标记有机固体中的相干偏振转移进行 1H-1H 距离测量的魔角旋转 NMR 方法。
DOI:
10.1063/1.2993170
复制
发表时间:
2008
期刊:
影响因子:
--
通讯作者:
T. Fujiwara
中科院分区:
文献类型:
--
作者:
Hiroki Takahashi;H. Akutsu;T. Fujiwara
We have developed a theory for (1)H-(1)H distance measurements from the direct polarization transfer in (13)C-labeled solids under magic-angle spinning. The polarization transfer caused by the (1)H-(1)H dipolar interactions was analyzed with zeroth-order average Hamiltonian for a (1)H-(13)C-(13)C-(1)H spin system in the frame modulated by (13)C-(1)H dipolar interactions and chemical shifts. Strong (13)C-(1)H dipolar couplings primarily determine the recovery of the (1)H-(1)H coupling as a function of sample spinning frequency. The effect of additional (1)H spins on the polarization transfer was also taken into account. We have applied this method to the distance measurements for uniformly (13)C-, (15)N-labeled L-valine and adenosine. Experimental (1)H polarization transfer was monitored through high-resolution (13)C-NMR. The theoretical analysis provided the distances up to about 3 A with an accuracy of about 0.2 A and those of about 4 A with 1 A even from the transfer amplitudes at a few mixing times. The longer distances are partly affected by the relayed polarization transfer which makes apparent (1)H-(1)H distances shorter. Our theory based on the coherent polarization transfer in the initial build-up regime was compared to the description by the rate equations with spin diffusion time constants.
DOI:
10.1073/pnas.88.4.1237
发表时间:
1991
影响因子:
11.1
作者:
Thomas,PD;Basus,VJ;James,TL
通讯作者:
James,TL
DOI:
10.1107/s0108768190012903
发表时间:
1991
期刊:
Acta crystallographica. Section B, Structural science
影响因子:
--
作者:
Klooster,WT;Ruble,JR;Craven,BM;McMullan,RK
通讯作者:
McMullan,RK
DOI:
10.1006/jmre.1998.1584
发表时间:
1998
期刊:
Journal of magnetic resonance (San Diego, Calif. : 1997)
影响因子:
--
作者:
Kojima,C;Ono,A;Kainosho,M;James,TL
通讯作者:
James,TL