School of Chemistry, University of Southampton, SO171BJ, UK.
Phys Chem Chem Phys. 2011 Jan 7;13(1):93-6. doi: 10.1039/c0cp01262a. Epub 2010 Oct 21.
A new solid-state NMR method is presented for estimating homonuclear dipole-dipole couplings for selected groups of nuclear spins in a multiple-spin coupled network. The methodology combines off-magic-angle spinning, frequency selective spin echoes, and multiple quantum filtering. The new method is insensitive to incoherent relaxation effects and may be used to estimate weak couplings. Internuclear (13)C-(13)C couplings are estimated in uniformly (13)C-labelled l-Histidine·HCl·H(2)O. Weak intermolecular couplings between (13)C nuclei separated by distances exceeding 6 Å are estimated.
本文提出了一种新的固态 NMR 方法，用于估计多自旋耦合网络中特定核自旋组的同核偶极-偶极耦合。该方法结合了非魔角旋转、频率选择自旋回波和多量子滤波。新方法对非相干弛豫效应不敏感，可用于估计弱耦合。在均匀（13）C 标记的 l-组氨酸·HCl·H2O 中估计了核间（13）C-（13）C 耦合。估计了距离超过 6 Å 的（13）C 核之间的弱分子间耦合。
