A Study on the Relationship between the Twisted π-Conjugate System of 1,5-Diaryl-1,5-diazapenta-1,3-dienes and Their Photophysical Properties
作者:Akio Kamimura、Hideki Matsu、Hiroyuki Suzukawa、Eisuke Sato、Michinori Sumimoto、Hidemitsu Uno
DOI:10.1246/cl.2012.984
日期:2012.9.5
One-pot treatment of commercially available 1,3,3-tributoxy-2-cyanopropene with 2 equivalents of primary aromatic amines readily afforded 1,5-diaryl-1,5-diaza-3-cyanopenta-1,3-dienes. UV properties varied as steric size of the ortho-substituent in the N-aryl units increased. X-ray crystallographic analyses indicated preferable conformation of these compounds, and the twist angles between 1,5-diazapentadiene and aromatic units were measured. The relationship between the twisted angles and UV absorptions was rationalized by MO calculation, and the UV peak wavelengths are useful for the estimation of the twisted angles. A novel tetracoordinate diaryl-1,5-diazapentadiene was prepared. UV spectrum for its lithium complex in CHCl3 supported that the complex had a twisted conformation of the aryl units because the two etharial oxygen atoms coordinated to lithium cation.
将市售的 1,3,3-三丁氧基-2-氰基丙烯与 2 个等量的芳香族伯胺进行一锅处理,很容易得到 1,5-二芳基-1,5-二氮杂-3-氰基戊-1,3-二烯。随着 N-芳基单元中正位取代基立体尺寸的增加,紫外特性也随之变化。X 射线晶体学分析表明了这些化合物的优选构象,并测量了 1,5-二氮杂戊二烯与芳香单元之间的扭角。扭角与紫外吸收之间的关系通过 MO 计算得到了合理解释,紫外峰值波长有助于估算扭角。制备了一种新型四配位二芳基-1,5-二氮杂戊二烯。其锂络合物在 CHCl3 中的紫外光谱证明,由于两个乙氧基与锂阳离子配位,该络合物的芳基单元具有扭曲构象。