由3,4-二氟吡咯和丙二酰氯制备1,3-二吡咯基-1,3-丙二酮BF2复合物的β-氟化衍生物(2b),然后用BF3.OEt2处理。尽管具有简单,无环和中性的结构,但2b在CH2Cl2中使用桥连的CH和吡咯NH作为相互作用部位,对阴离子具有有效的1:1结合。据估计,乙酸盐(CH3CO(2-))的2b结合常数(Ka)比阴离子阴离子更有效,例如F-,Cl-,Br-,H2PO(4-)和HSO(4-)。是9.6 x 10(5)M(-1),大约是β-H衍生物2a(1.1 x 10(5)M(-1))的9倍。2b的紫外可见和荧光光谱变化阐明了对阴离子形式的氨基酸(例如苯丙氨酸)的有效识别;CD光谱变化以及L和D异构体的镜像也支持这一点。
through ion pairing of planarreceptor-anioncomplexes and cation modules as negatively and positively charged building blocks, respectively. Anion receptors that could not form soft materials by themselves provided mesophases upon anion binding and subsequent ion pairing with aliphatic cation modules. The mesogenic behaviors were affected by structural modification of both the cation module and the anion
离子基材料是通过平面受体 - 阴离子复合物和阳离子模块的离子配对制造的,分别作为带负电和正电的构建块。自身不能形成软材料的阴离子受体在阴离子结合和随后的离子与脂肪族阳离子模块配对时提供中间相。介晶行为受到阳离子模块和阴离子受体的结构修饰的影响。同步加速器 X 射线衍射测量表明柱状中间相的形成具有逐电荷和电荷分离排列的贡献。
Solid-state supramolecular assemblies consisting of planar charged species
作者:Yohei Haketa、Mayumi Takayama、Hiromitsu Maeda
DOI:10.1039/c2ob07059f
日期:——
Pyrrole-based π-conjugatedanion-responsivemolecules provided various planar anionic structures by complexation with halide anions, resulting in the formation of solid-state assemblies with planar counter cations and exhibiting various modes of charge-by-charge assembly depending on the substituents of the anion receptors.
Anion complexes of anion‐responsive π‐electronic molecules can behave as pseudo π‐electronic anions providing various ionpairs in combination with countercations. In this study, single crystals of ion‐pairing assemblies comprising porphyrin–AuIII complexes and Cl− complexes of dipyrrolyldiketone BF2 complexes were prepared from 1:1 mixtures of anion receptors and the Cl− salts of cationic porphyrins