Conformational studies of a constrained tryptophan derivative: implications for the fluorescence quenching mechanism
作者:William J. Colucci、Luanne Tilstra、Melissa C. Sattler、Frank R. Fronczek、Mary D. Barkley
DOI:10.1021/ja00181a022
日期:1990.12
The ground-state conformation of a rotationally constrained tryptophan derivative, 3-carboxy-1,2,3,4-tetrahydro-2-carboline, W(1), is determined from single-crystal X-ray diffraction, MM2 calculations, and 1 H NMR coupling constants. The solid-state structure represents the predominant solution conformation. W(1) populates only two minimum-energy conformations in solution, which correspond to the half-chair
旋转受限色氨酸衍生物 3-carboxy-1,2,3,4-tetrahydro-2-carboline,W(1) 的基态构象由单晶 X 射线衍射、MM2 计算和1 H NMR耦合常数。固态结构代表了主要的溶液构象。W(1) 在溶液中仅填充两个最小能量构象,它们对应于环己烯的半椅形式。构象异构体的主要区别在于羧酸盐与吲哚环的距离