3-hydroxybenzyl alcohol with K2/K1 = 3-33. Both the entropy and the enthalpy terms are important in this allosteric system; the crystallographic studies provide the first clear evidence that the cooperativity in amidehydrogenbonding by polarization contributes to the positive homotropic allosteric binding property.
Acene-based organic semiconductor materials and methods of preparing and using the same
申请人:Facchetti Antonio
公开号:US20080185555A1
公开(公告)日:2008-08-07
Acene-based compounds that can be used to prepare n-type semiconductor materials are provided with processes for preparing the same. Composites and electronic devices including n-type semiconductor materials prepared from these compounds also are provided.
The macrocyclization of 2,6‐diethynyl hydrindacenes (1) with functional groups at mutually perpendicular positions results in the formation of novel macrocycles which, as a result of the hindered rotation of the hydrindacene units, possess directionally persistent peripheral functionalities. The two hydrindacene units in the dimer macrocycle (2) have been shown to interact electronically through their
by the Diels-Alder (DA) reaction of maleicanhydride and acecyclone derivative bearing an acenaphthylene imide unit and subsequent imidations. An X-ray crystallographic analysis of di(N-octyl)FDI derivative reveals the planar fluoranthene diimide π -system. The cyclic voltammograms of FDIs shows considerably high electron affinity. Moreover, its π -extended analogue involving an anthracene unit (DAAI)
首先通过马来酸酐和带有bearing烯酰亚胺单元的乙酰环酮衍生物的狄尔斯-阿尔德(DA)反应和随后的酰亚胺化反应,首先合成3,4,8,9-氟代蒽四羧酸二酰亚胺(FDI)作为稳定的黄色化合物。二(N-辛基)FDI衍生物的X射线晶体学分析揭示了平面荧蒽二酰亚胺π-系统。FDI的循环伏安图显示出很高的电子亲和力。此外,还通过by-3,4-二羧酸酰亚胺与邻-亚二甲苯基衍生物的DA反应制备了其包含蒽单元(DAAI)的π-延伸类似物。该化合物表现出长波长吸收和强烈的荧光中度solvatofluorochromism(Δ λ EM = 41 nm)。进行了基于密度泛函理论(DFT)的理论计算,以表征这些二酰亚胺的电子特征。