Dicondensed indolinobenzospiropyrans as precursors of thermo- and photochromic spiropyrans. Part II: assignment of1H and13C NMR spectra
作者:Sam-Rok Keum、Su-Mi Ahn、Se-Jung Roh、Su-Jin Park、Sung-Hoon Kim、Kwangnak Koh
DOI:10.1002/mrc.1718
日期:2006.1
The 1H and 13C NMR spectra of dicondensed indolinobenzospiropyrans as precursors of thermo‐ and photochromic spiropyrans, DC1–DC5, were completely assigned. Especially, the 1H assignment and coupling characteristics of the diastereotopic protons at the carbon‐3 position of the benzopyran rings were achieved by conducting 1H–1H COSY and nOe experiments. The dihedral angles (θ1, θ2 and θ3) calculated
作为热致变色和光致变色螺吡喃 DC1-DC5 前体的二缩合吲哚并苯并螺吡喃的 1H 和 13C NMR 谱被完全指定。特别是,苯并吡喃环的碳 3 位非对映质子的 1H 分配和耦合特性是通过进行 1H-1H COZY 和 nOe 实验实现的。由 DC5 的邻位耦合常数 (3J) 的实验值计算出的二面角 (θ1、θ2 和 θ3) 与固态下的观察值非常吻合。通过异核 2D 位移相关光谱 (HETCOR) 和 DEPT135 的组合研究 DC 染料分子中的所有碳。版权所有 © 2005 John Wiley & Sons, Ltd.