Invited for this month's cover picture is the group of Evgeny A. Kataev at the Technical University Chemnitz. The cover picture shows the authors’ association of fluorescence anion sensing with pearl hunting – the activity of recovering pearls from wild molluscs. In the presented work, the group of Kataev has developed a new water‐soluble amido‐amine azacryptand bearing a fluorescence anthracene dicarboxamide fragment. With the help of the fluorescent receptors (a hand) one can catch the phosphate anion (a glowing pearl) and visualize this binding event. The recognition of phosphate and oxalate has led to a fluorescent enhancement in a selective manner. Read the full text of their Communication at 10.1002/open.201900309.

中文翻译：

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在中性水条件下，基于蒽的阴离子识别用酰胺基胺笼式受体。

开姆尼茨技术大学的Evgeny A. Kataev受邀参加本月的封面照片。封面图片显示了作者将荧光阴离子感测与捕猎珍珠联系在一起-从野生软体动物中回收珍珠的活性。在介绍的工作中，Kataev研究小组开发了一种新的水溶性氨基酰胺氮杂密码子，带有荧光蒽二甲酰胺片段。借助荧光受体（一只手），可以捕获磷酸根阴离子（发光的珍珠）并可视化此结合事件。磷酸盐和草酸盐的识别以选择性的方式导致荧光增强。阅读其通讯全文，网址为10.1002 / open.201900309。