Conformationally flexible “Carbene–Metal–Amide” (CMA) complexes of copper and gold have been developed based on a combination of sterically hindered cyclic (alkyl)(amino)carbene (CAAC) and 6- and 7-ring heterocyclic amide ligands. These complexes show photoemissions across the visible spectrum with PL quantum yields of up to 89% in solution and 83% in host-guest films. Single crystal X-ray diffraction and photoluminescence (PL) studies combined with DFT calculations indicate the important role of ring structure and conformational flexibility of the amide ligands. Time-resolved PL shows efficient delayed emission with sub-microsecond to microsecond excited state lifetimes at room temperature, with radiative rates exceeding 10⁶ s⁻¹. Yellow organic light-emitting diodes (OLEDs) based on a 7-ring gold amide were fabricated by thermal vapor deposition, while the sky-blue to warm-white mechanochromic behavior of the gold phenothiazine-5,5-dioxide complex enabled fabrication of the first CMA-based white light-emitting OLED.

中文翻译：

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碳金属酰胺光发射体：定制构象柔性酰胺以实现全色范围发射，包括发白光的OLED

基于空间受阻的环状（烷基）（氨基）碳烯（CAAC）与6环和7环杂环酰胺配体的组合，开发了铜和金的构形灵活的“碳烯-金属-酰胺”（CMA）络合物。这些配合物在可见光谱中显示出光发射，溶液中的PL量子产率高达89％，主客体膜的PL量子产率高达83％。单晶X射线衍射和光致发光（PL）研究与DFT计算相结合，表明了酰胺配体的环结构和构象柔韧性的重要作用。时间分辨的PL显示出有效的延迟发射，在室温下具有亚微秒至微秒的激发态寿命，辐射速率超过10 ⁶ s ^-1。通过热气相沉积法制备了基于7环金酰胺的黄色有机发光二极管（OLED），而吩噻嗪-5,5-二氧化金复合物的天蓝色至暖白机械变色行为使得能够制备5,5-二氧噻吩金。第一款基于CMA的发白光OLED。