From Low to Very High Birefringence in Bis(2-pyridylimino)isoindolines: Synthesis and Structure-Property Analysis
作者:Edwin W. Y. Wong、Jeffrey S. Ovens、Daniel B. Leznoff
DOI:10.1002/chem.201103421
日期:2012.5.29
substituted 1,3‐bis(2‐pyridylimino)isoindolines—1,3‐bis(2‐pyridylimino)‐5,6‐bis(2,6‐diisopropylphenoxy)isoindoline (2 b), 1,3‐bis(2‐pyridylimino)‐5,6‐bis(4‐tert‐butylphenyl)isoindoline (2 c), and 1,3‐bis(2‐pyridylimino)‐5‐tert‐butylisoindoline (2 d)—were synthesized and structurally characterized by single‐crystal X‐ray diffraction. The birefringence (Δn) of the crystals of unsubstituted 1,3‐bis(2‐pyridylimino)isoindoline
一系列新的取代的1,3-双(2-吡啶甲基)异吲哚啉-1,3-双(2-吡啶甲基)-5,6-双(2,6-二异丙基苯氧基)异吲哚啉(2 b),1,3-合成了bis(2-pyridylimino)-5,6-bis(4-叔丁基苯基)异吲哚啉(2 c)和1,3-bis(2-pyridylimino)-5-叔丁基异吲哚啉(2 d)-在结构上以单晶X射线衍射为特征。测量未取代的1,3-双(2-吡啶并氨基)异吲哚啉(2 a),2 b,2 c和2 d晶体的双折射(Δn),发现其变化很大,Δn值分别为0.0654(3),0.0629(17),0.588(10),0.701(12)。概述了双折射值2 a - 2 d的结构-性质关系,并表明分子极化率的各向异性在晶体的双折射中起着至关重要的作用。当分子以分子间面对面配置并沿着要测量的晶体学面取向时,可以获得最大的双折射值。