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Fluorescence quantum yields of dye aggregates: a showcase example based on self-assembled perylene bisimide dimers†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-03-01 00:00:00 , DOI: 10.1039/c7cp07778e Franziska Fennel 1, 2, 3, 4 , Jana Gershberg 2, 3, 4, 5 , Matthias Stolte 1, 2, 3, 4, 5 , Frank Würthner 1, 2, 3, 4, 5
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-03-01 00:00:00 , DOI: 10.1039/c7cp07778e Franziska Fennel 1, 2, 3, 4 , Jana Gershberg 2, 3, 4, 5 , Matthias Stolte 1, 2, 3, 4, 5 , Frank Würthner 1, 2, 3, 4, 5
Affiliation
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Constituting an intermediate state of matter between molecules and solid state materials, dye aggregates can give important insights into functional properties. Despite the importance of fluorescence for many applications, it turns out that the conventional methods for quantum yield determination are not applicable to dye aggregates and so far no method has been introduced for the accurate determination of the fluorescence quantum yields of dye aggregates. Here we suggest two measurement routines for the quantum yield determination of strongly absorbing dye aggregates. Both methods provide the quantum yield of the aggregated species without the necessity of reaching a fully aggregated state, which is particularly important for the most common case imparted by the low association constants of π–π-stacking interactions. The routines are experimentally validated with two perylene bisimide dyes whose self-assembly is driven by the concerted interplay of hydrogen bonding and π–π-stacking interactions, leading to structurally well defined co-facially stacked dimers at intermediate concentrations and a further growth into larger H-aggregates at a higher concentration. Compared to other H-aggregates relatively high fluorescence quantum yields of up to 28% are found for both the co-facially stacked dimers and the larger H-aggregates.
中文翻译：
染料聚集体的荧光量子产率：基于自组装per双酰亚胺二聚体的展示示例†
染料聚集体在分子和固态材料之间构成物质的中间状态，可以提供有关功能特性的重要见解。尽管荧光在许多应用中很重要，但事实证明，确定量子产率的常规方法不适用于染料聚集体，并且迄今为止，还没有引入任何方法来准确确定染料聚集体的荧光量子产率。在这里，我们提出了两种测量程序，用于确定强吸收染料聚集体的量子产率。两种方法都可以提供聚集物种的量子产率，而无需达到完全聚集状态，这对于π-π堆积相互作用的低缔合常数所赋予的最常见情况尤为重要。该程序已用两种per二酰亚胺染料进行了实验验证，其自组装是由氢键和π-π堆积相互作用的相互作用共同驱动的，从而导致在中等浓度下结构清晰的共面堆积的二聚体进一步生长成更大的H聚集体浓度更高。与其他H聚集体相比，共面堆叠的二聚体和较大的H聚集体均具有高达28％的相对较高的荧光量子产率。
更新日期：2018-03-01
中文翻译：
染料聚集体的荧光量子产率：基于自组装per双酰亚胺二聚体的展示示例†
染料聚集体在分子和固态材料之间构成物质的中间状态，可以提供有关功能特性的重要见解。尽管荧光在许多应用中很重要，但事实证明，确定量子产率的常规方法不适用于染料聚集体，并且迄今为止，还没有引入任何方法来准确确定染料聚集体的荧光量子产率。在这里，我们提出了两种测量程序，用于确定强吸收染料聚集体的量子产率。两种方法都可以提供聚集物种的量子产率，而无需达到完全聚集状态，这对于π-π堆积相互作用的低缔合常数所赋予的最常见情况尤为重要。该程序已用两种per二酰亚胺染料进行了实验验证，其自组装是由氢键和π-π堆积相互作用的相互作用共同驱动的，从而导致在中等浓度下结构清晰的共面堆积的二聚体进一步生长成更大的H聚集体浓度更高。与其他H聚集体相比，共面堆叠的二聚体和较大的H聚集体均具有高达28％的相对较高的荧光量子产率。
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