Yamada Kazuhiko, Masuda Yuichi
Interdisciplinary Science Unit, Multidisciplinary Sciences Cluster, Research and Education Faculty, Kochi University, Kochi, Japan.
Graduate School of Bioresources, Mie University, Tsu, Japan.
Magn Reson Chem. 2023 May;61(5):296-300. doi: 10.1002/mrc.5333. Epub 2023 Jan 27.
The sulfur electric-field-gradient tensor for a disulfide bond in S -labeled L-cystine has been investigated by S nuclear quadrupole resonance (NQR). S -labeled L-cystine is synthesized by introduction of disulfide ions prepared from elemental S-sulfur into an amino acid derivative, the side chain of which is iodinated. In its NQR spectrum, sharp single peaks are observed at between 24.63 and 24.90 MHz in the temperature range from 80 to 298 K. The two-dimensional nutation echo S NQR experiment is carried out at 160 K, and the quadrupole coupling constant, C , and the asymmetric parameter, η , are obtained to be 46.9(9) MHz and 0.6(1), respectively. The calculated S electric-field-gradient tensor components with respect to the molecular frame is briefly discussed.
通过硫核四极共振（NQR）研究了S标记的L-胱氨酸中二硫键的硫电场梯度张量。S标记的L-胱氨酸是通过将由元素硫制备的二硫离子引入氨基酸衍生物中合成的，该氨基酸衍生物的侧链已碘化。在其NQR光谱中，在80至298K的温度范围内，在24.63至24.90MHz之间观察到尖锐的单峰。二维章动回波S NQR实验在160K下进行，得到四极耦合常数C和不对称参数η分别为46.9(9)MHz和0.6(1)。简要讨论了相对于分子框架计算的S电场梯度张量分量。
