杂环供体- π基于一个端受体分子系统Ñ,ñ -二甲基氨基苯基丙烯腈的苯并咪唑骨架已被表征并提出了潜在用途在传感应用。苯并咪唑部分为系统引入了广泛的有用多功能特性,包括电子接受能力,pH敏感性和与生物分子的相容性。这些生色团的质子形式的光物理表征已经在溶液中和固定在聚合物膜中进行。通过计算确定p K a值进一步支持了实验结果。注意到化合物3在水溶液中以600 nm的聚集诱导发射(AIE)形式形成纳米聚集体。所有系统都证明了在酸性介质中的光谱pH敏感性,当固定在聚合物薄膜中或在水性环境中聚集时(化合物3),pH敏感性接近中性值。已经确定了这些功能性发色团的结构-性质关系,包括其光谱特征,酸碱平衡,p K a值和聚集效应。基于分子的pH敏感性和AIE特性,提出了分子作为pH和生物分子传感器的潜在应用。
Microwave-assisted expeditious approach towards benzimidazole acrylonitrile derivatives exploring a new silica supported SBPTS catalyst
作者:Faheem Ahmad、Mehtab Parveen
DOI:10.1039/c8nj01436a
日期:——
The present study reports a simple, highly efficient and green approach for the synthesis of a series of benzimidazole-acrylonitrile derivatives 3(a–l). The synthetic methodology involves a microwave-assisted reaction exploring novel silica-supported SBPTS as a heterogeneous, proficient and reusablecatalyst resulting in excellent yields. The reaction transformation presumably occurs via a Knoevenagel
Synthesis, X-ray Crystal Structures, Stabilities, and in Vitro Cytotoxic Activities of New Heteroarylacrylonitriles
作者:Franciszek Sa̧czewski、Przemyslaw Reszka、Maria Gdaniec、Renate Grünert、Patrick J. Bednarski
DOI:10.1021/jm0311036
日期:2004.6.1
that position 2 is flexible for substituents with various nitrogen heterocyclics while position 3 is very sensitive to change; the most potent compounds contained a 5-nitrothiophen-2-yl ring at position 3 and either benzimidazol-2-yl (11) or a 5-benzyl-1H-[1,2,4]-triazol-3-yl (7) group at position 2 of acrylonitrile. SARs for the thiophen-2-yl-benzimidazoles show the following trend for position 5: NO2
Benzimidazole acrylonitriles as multifunctional push-pull chromophores: Spectral characterisation, protonation equilibria and nanoaggregation in aqueous solutions
pH sensitivity and compatibility with biomolecules. The photophysical characterisation of the prototropic forms of these chromophores has been carried out in both solution and on immobilisation in polymer films. The experimental results are further supported by computational determination of pKavalues. It is noticed that compound 3 forms nanoaggregates in aqueous solutions with aggregation-induced
杂环供体- π基于一个端受体分子系统Ñ,ñ -二甲基氨基苯基丙烯腈的苯并咪唑骨架已被表征并提出了潜在用途在传感应用。苯并咪唑部分为系统引入了广泛的有用多功能特性,包括电子接受能力,pH敏感性和与生物分子的相容性。这些生色团的质子形式的光物理表征已经在溶液中和固定在聚合物膜中进行。通过计算确定p K a值进一步支持了实验结果。注意到化合物3在水溶液中以600 nm的聚集诱导发射(AIE)形式形成纳米聚集体。所有系统都证明了在酸性介质中的光谱pH敏感性,当固定在聚合物薄膜中或在水性环境中聚集时(化合物3),pH敏感性接近中性值。已经确定了这些功能性发色团的结构-性质关系,包括其光谱特征,酸碱平衡,p K a值和聚集效应。基于分子的pH敏感性和AIE特性,提出了分子作为pH和生物分子传感器的潜在应用。
Reversible pH switchable aggregation-induced emission of self-assembled benzimidazole-based acrylonitrile dye in aqueous solution
aggregation-induced emission (AIE) at 600 nm in the physiologically relevant pH range. The aggregation and emission are pH switchable and fully-reversible. The molecule is shown to similarly function in the solid state where its emission can be modulated by exposure to acidic and basic vapours. Multicolour and reversibly pH switchable tri-state emission from a single fluorophore containing a biologically