Unsymmetric leuco-TAM dyes, (2E, 2′E)-2,2′-{(E)-4-phenylpent-2-ene-1,5-diylidene}bis(1,3,3-trimethylindoline) derivatives. Part II: X-ray crystal structure
作者:Sam-Rok Keum、So-Young Ma、Do-Kyung Kim、Hyun-Woo Lim、Se-Jung Roh
DOI:10.1016/j.dyepig.2012.02.007
日期:2012.9
unequivocal solid-state structure and stereochemistry of the unsymmetric leuco-triarylmethane (Un-LTAM) dye 2,2′-(E)-4-(phenyl)pent-2-ene-1,5-diylidene}bis(1,3,3-trimethylindoline) derivatives were established using X-ray single-crystal analysis. The X-ray analysis showed that the EEE isomers were formed stereoselectively with an unsymmetric three-bladed propeller conformation from the reaction of a Fischer's
不对称隐色三芳基甲烷(Un-LTAM)染料2,2'-(E)-4-(苯基)戊-2-烯-1,5-二亚甲基} bis(1)的明确固态结构和立体化学使用X射线单晶分析确定了(3,3-三甲基二氢吲哚)衍生物。X射线分析表明,由Fischer碱和肉桂醛衍生物反应生成的EEE异构体具有不对称的三叶螺旋桨构象,是立体选择性地形成的。5,5'-二氯-4”-硝基三芳基甲烷染料显示三斜晶结构,空间群为P-1。分子交替堆叠形成二聚体,环B和C的分子间距离分别为8.53和9.40Å。这些染料的氧化形式不对称的三芳基甲烷阳离子在680 nm处具有紫外线吸收,并且选定的示例在接近IR区域吸收。