Photophysical Studies of a New Water Soluble Indocarbocyanine Dye Adsorbed onto Microcrystalline Cellulose and beta-Cyclodextrin
作者:Reda El-Shishtawy、Anabela Oliveira、Paulo Almeida、Diana Ferreira、David Conceição、Luis Ferreira
DOI:10.3390/molecules18055648
日期:——
A water-soluble indocarbocyanine dye was synthesized and its photophysics were studied for the first time on two solid hosts, microcrystalline cellulose and b-cyclodextrin, as well as in homogeneous media. The inclusion of the indocarbocyanine moiety onto microcrystalline cellulose increased the dye aggregation with both H and J aggregates being formed. Adsorption on b-cyclodextrin enhanced aggregation
合成了水溶性 indocarbocyanine 染料,并首次在两种固体基质、微晶纤维素和 b-环糊精以及均相介质中研究了其光物理。将吲哚羰花青部分包含在微晶纤维素上增加了染料聚集,同时形成了 H 和 J 聚集体。b-环糊精的吸附以类似的方式增强聚集。测定了两种主体上花青染料粉末样品的荧光量子产率,并观察到相对于均匀溶液的显着增加。在这两种情况下也检测到显着的浓度依赖性。寿命分布分析表明,吲哚羰花青染料主要占据纤维素的无定形部分,并没有夹带在该主体的结晶部分中。在 b-CD 情况下,吸附发生在宿主腔外。在两种宿主中都观察到强烈的浓度猝灭效应,并且只有单体发射。两种吸附都可以通过与吲哚羰花青染料的氮原子相连的两个长磺乙基尾部所施加的立体化学约束来解释。