Intensely blue-fluorescent 2,5-bis(benzoimidazol-2-yl)pyrazine dyes with improved solubility: their synthesis, fluorescent properties, and application as microenvironment polarity probes
作者:Ryota Saito、Yuriko Matsumura、Saori Suzuki、Naoki Okazaki
DOI:10.1016/j.tet.2010.08.036
日期:2010.10
In order to improve the solubility of intensively fluorescent 2,5-bis(benzimidazol-2-yl)pyrazine (BBIP), we synthesized new BBIP derivatives (2, 3a,b, and 5a,b) possessing two alkyl chains at the N-1 and N-1′ positions of the two benzimidazole moieties. Characterization of these compounds demonstrated that they exhibit high fluorescence intensity even in protic solvents, as well as solvatochromic fluorescence
为了提高集中荧光2,5-双(苯并咪唑-2-基)吡嗪(BBIP)的溶解性,我们合成了新BBIP衍生物(2,图3a,b,和图5a,b在N具有两个烷基链)两个苯并咪唑部分的-1和N-1'位置。这些化合物的表征表明,它们表现出高的荧光强度即使在质子溶剂,以及溶剂化的荧光,其中它们的荧光最大值在甲醇水溶液中表现出与增加的红移ɛ ř介质的值。我们利用了5a作为微环境极性探针,通过测量由聚合物的热相转变引起的光谱变化来指示温度敏感的聚(N-异丙基丙烯酰胺)主链周围的极性变化。