Nanohoops, cyclic association of π‐conjugated systems to form a hoop‐shaped molecule, have been widely developed in the last 15 years. Beyond the synthetic challenge, the strong interest towards these molecules arise from their radially‐oriented π‐orbitals, which provide singular properties to these fascinating structures. Thanks to their particular cylindrical arrangement, this new generation of curved molecules have been already used in many applications such as host‐guest complexation, biosensing, bioimaging, solid‐state emission and catalysis. However, their potential in organic electronics has only started to be explored. From the first incorporation as an emitter in fluorescent Organic Light Emitting Diode (OLED), to the recent first incorporation as host in Phosphorescent OLED or as charge transporter in Organic Field‐Effect Transistor (OFET) and in Organic Photovoltaics (OPV), this field has shown important breakthroughs in recent years. These finding have revealed that curved materials can play a key role in the future and can even be more efficient than their linear counterparts. This can have important repercussions for the future of electronics. Time is now come to overview the different nanohoops used to date in electronic devices in order to stimulate the future molecular designs of functional materials based on these macrocycles.

中文翻译：

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π共轭纳米环：新一代有机电子弯曲材料


纳米环（Nanohoops），即 π 共轭系统的循环缔合，形成环状分子，在过去 15 年中得到了广泛的发展。除了合成挑战之外，人们对这些分子的强烈兴趣还源于它们的径向取向的 π 轨道，这为这些迷人的结构提供了奇异的特性。由于其特殊的圆柱形排列，新一代弯曲分子已被用于许多应用，例如主客体络合、生物传感、生物成像、固态发射和催化。然而，它们在有机电子领域的潜力才刚刚开始被探索。从首次在荧光有机发光二极管 (OLED) 中作为发射体，到最近首次在磷光 OLED 中作为主体，或在有机场效应晶体管 (OFET) 和有机光伏 (OPV) 中作为电荷传输体，该领域近年来取得了重要突破。这些发现表明，弯曲材料可以在未来发挥关键作用，甚至可以比线性材料更有效。这可能会对电子产品的未来产生重要影响。现在是时候概述迄今为止在电子设备中使用的不同纳米环，以刺激基于这些大环的功能材料的未来分子设计。