A Self-Assembled Unit Comprising 12 Squaraine Dyes Built Up from Two Star-Shaped Hexasquarainyl-Benzene Molecules.

A Self-Assembled Unit Comprising 12 Squaraine Dyes Built Up from Two Star-Shaped Hexasquarainyl-Benzene Molecules.
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由 12 种方酸菁染料组成的自组装单元,由两个星形六方酸菁基苯分子构成

DOI:
10.1002/chem.201805685
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
C. Lambert
C. Lambert
中科院分区:
--
文献类型:
--
作者:
M. H. Schreck;M. I. S. Röhr;T. Clark;V. Stepanenko;F. Würthner;C. Lambert

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我们描述了一个星星状的六芳基苯与六个方酸菁发色团(=hexasquarainyl benzene)的聚集体形成和光学性质。在丙酮/CHCl 3混合物中的全面浓度依赖性研究揭示了形成离散二聚体聚集体的强烈倾向,其结合常数超过106 m −1。在这种情况下,在吸收光谱中发现了近2700 cm− 1的大的蓝移,表明H型激子耦合。 聚集带的特征是非常小的带宽,只有560 cm−1,可能是由交换窄化引起的。 实验和计算方法被用来阐明的超分子聚集体结构,这是假定由两个堆叠的hexasquarainyl苯单体。
We describe the aggregate formation and optical properties of a star‐shaped hexaarylbenzene with six squaraine chromophores (=hexasquarainyl benzene). Comprehensive concentration‐dependence studies in acetone/CHCl3mixtures reveal a strong propensity to form discrete dimeric aggregates with a high binding constant in excess of 106m−1. In this context, a large hypsochromic shift of almost 2700 cm−1was found in the absorption spectrum, indicating H‐type exciton coupling. The aggregate band is characterised by a very small band width of only 560 cm−1, probably caused by exchange narrowing. Both experimental and computational methods were used to elucidate the supramolecular aggregate structure, which is assumed to consist of two stacked hexasquarainyl benzene monomers.
DOI: 10.1016/s0301-0104(02)00384-1
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