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Aggregation and structural study of the monolayers formed by an amphiphilic thiapentacarbocyanine

机译:两亲硫喷喷碳菁形成的单层的聚集与结构研究。

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Exotic assemblies with unique photophysical features can be built based on organic dyes at the air-liquid interface. Langmuir monolayers of N,N'-dioctadecylthiapentacarbocyanine (OTCC) at air-water and air-solid interfaces have been studied. A single type of domain and presumably of one single aggregate type has been found by Brewster angle microscopy. Peanut-shaped domains with internal anisotropy have been observed. However, this structure leads to a complex absorption spectrum which shows 4 bands, two red-shifted (822 nm and 757 nm), and two blue-shifted (600 nm and 530 nm) with respect to the monomer band (665 nm). Our results confirm that all the absorption components are polarized in approximately the same direction. The absence of an emission spectrum indicates that this interfacial aggregate cannot be classified as a simple J-aggregate. Moreover, these bands cannot relate to Davydov splitting, given that all of them have the same polarization direction. We propose possible explanations based on a strong exciton-phonon interaction, and/or the formation of aggregates with different coherent lengths within the domain. The basic exciton model cannot explain this behavior. The coherent aggregate described in this study is proposed as a unique dye supramolecular structure obtained by assembly at the air-liquid interface.
机译:可以在气液界面上基于有机染料构建具有独特光物理特征的奇异组件。已经研究了N,N'-二十八烷基硫杂五碳菁(OTCC)在空气-水和气固界面处的Langmuir单层。通过布鲁斯特角显微镜已经发现了一种类型的结构域,大概是一种单一的聚集体类型。已经观察到具有内部各向异性的花生形区域。然而,这种结构导致了复杂的吸收光谱,该光谱显示出相对于单体带(665 nm)的四个波段,两个红移(822 nm和757 nm)和两个蓝移(600 nm和530 nm)。我们的结果证实,所有吸收成分都在大致相同的方向上极化。没有发射光谱表明该界面聚集体不能归类为简单的J聚集体。此外,假设所有波段都具有相同的偏振方向,则这些波段不能与达维多夫分裂有关。我们提出基于强激子-声子相互作用和/或在域内具有不同相干长度的聚集体形成的可能解释。基本激子模型无法解释此行为。这项研究中描述的相干聚集体被提议为通过在气液界面处组装而获得的独特的染料超分子结构。

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