Temperature‐dependent dual fluorescence and switchable circularly polarized luminescence (CPL) are two highly pursued but challenging properties for small organic molecules (SOMs). We herein disclose a triarylborane π‐system based on a 2,2′‐diamino‐6,6′‐diboryl‐1,1′‐binaphthyl scaffold that can serve as a versatile building block for achieving these two properties by simply choosing different amino groups. BNMe₂‐BNaph with less bulky dimethylamino groups displays temperature‐dependent dual fluorescence, and can thus be used as a highly sensitive ratiometric fluorescence thermometer. On the other hand, BNPh₂‐BNaph with bulky diphenylamino groups exhibits intense fluorescence in both solution and in the solid state. A change of solvent from nonpolar cyclohexane to highly polar MeCN not only shifts the CPL position to much longer wavelength but also inverts the CPL sign. In addition, the complexation of BNPh₂‐BNaph with fluoride greatly enhances the CPL intensity.

中文翻译：

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2,2'-二氨基-6,6'-二硼基-1,1'-联萘基：一种依赖于温度的双重荧光和可切换圆偏振发光的多功能构建基块

温度相关的双重荧光和可切换的圆偏振发光（CPL）是有机小分子（SOM）的两个高度追求但具有挑战性的特性。我们在此公开了一种基于2,2'-二氨基-6,6'-二硼基-1,1'-联萘基骨架的三芳基硼烷π系统，可以通过简单地选择不同的氨基来作为实现这两个特性的通用构件组。具有较小体积的二甲基氨基的BNMe ₂ -BNaph显示出温度依赖性的双重荧光，因此可以用作高灵敏度的比例荧光温度计。另一方面，BNPh ₂ -BNaph具有庞大的二苯氨基的化合物在溶液和固态下均显示出强烈的荧光。从非极性环己烷到高极性MeCN的溶剂变化不仅将CPL位置移动到更长的波长，而且使CPL符号反转。此外，BNPh ₂ -BNaph与氟化物的络合大大增强了CPL强度。