<sup>13</sup>C spin–lattice relaxation times and molecular motion in N-alkyltetrahydroisoquinoline derivatives
作者:Makiko Sugiura、Torei Sai、Narao Takao、Hideaki Fujiwara
DOI:10.1039/p29830000907
日期:——
anisotropic molecular motion. The calculated orientations of the major axes of molecular overall rotation reflect well the delicate differences in conformation of these derivatives. In quaternary salts, the longer alkyl chain restricts the rotational motion about the major axis more than that about the perpendicular axis, and brings the molecular motion close to the isotropic rotational one. Internal rotations
已经测量了N-甲基-1,2,3,4-四氢异喹啉和几种季铵N-甲基-N-烷基-1,2,3,4-四氢异喹啉盐的13 C自旋-晶格弛豫时间,并进行了分析在各向异性分子运动方面。分子整体旋转主轴的计算方向很好地反映了这些衍生物构象的细微差异。在季盐中,较长的烷基链对绕长轴的旋转运动的限制大于对绕垂直轴的旋转运动的限制,并使分子运动接近于各向同性的旋转运动。N的内部旋转还讨论了甲基。在这些衍生物中,阻挡到甲基的旋转,值V ø,彼此相似,以及作为旋转扩散速率,d我通过孤对或由,和相当大,由于空间位阻ñ -烷基。