L-酪氨酸 - 盐酸盐辐照单晶的电子自旋共振
Electron spin resonance of an irradiated single crystal of L-tyrosine-HC.
作者信息
Fasanella E L, Gordy W
出版信息
Proc Natl Acad Sci U S A. 1969 Feb;62(2):299-304. doi: 10.1073/pnas.62.2.299.
Abstract
Analysis of the electron spin resonance (ESR) of a gamma-irradiated single crystal of L-tyrosine-HCl reveals a free radical formed by loss of an H from the hydroxyl group attached to the ring. Principal g values of the radical are g(x) = 2.0023 +/- 0.0005, g(y) = 2.0067 +/- 0.0005, and g(z) = 2.0045 +/- 0.0005, with g(x) perpendicular to the plane of the ring and g(y) along the CO bond to the ring. Analysis of the hyperfine structure of the spectra shows electron spin density on C((2)) and C((6)) to be 0.24 and on C((4)) to be 0.32. Corresponding spin densities calculated from molecular orbital theory are 0.26 and 0.31, respectively.
摘要
对经γ射线辐照的L - 酪氨酸盐酸盐单晶进行电子自旋共振（ESR）分析，结果显示，从与环相连的羟基上失去一个氢原子后形成了一种自由基。该自由基的主要g值为g(x) = 2.0023 ± 0.0005，g(y) = 2.0067 ± 0.0005，g(z) = 2.0045 ± 0.0005，其中g(x)垂直于环平面，g(y)沿着与环相连的C = O键方向。对光谱超精细结构的分析表明，C(2)和C(6)上的电子自旋密度为0.24，C(4)上的电子自旋密度为0.32。根据分子轨道理论计算得到的相应自旋密度分别为0.26和0.31。
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