Visible light induced photochemical synthesis represents a promising approach towards green and sustainable organic transformations. However, this protocol is greatly limited because of overly dependence on the noble metal complex based photosensitizers. In this work, we firstly reported newly designed imide based conjugated polymer nanosheets as metal-free heterogeneous photocatalysts for efficient visible light driven oxygen activation. Upon integrating perylene core with triazine- and heptazine- blocks, ultrathin polyimide nanosheets with broad light response, deep valence band level, and excellent oxygen activation property were synthesized. The polymer photocatalysts exhibited superior photocatalytic activity for amine oxidation at room temperature under visible light irradiation. The conversion yield reached up to 99 % with nearly 100 % selectivity as N-benzyl benzaldimine was found the exclusive product. The conversion rates of 250 mmol g⁻¹ h⁻¹ was two orders of magnitude higher than that of representative polymer photocatalysts and metal oxide based semiconductors.

可见光诱导的光化学合成代表了实现绿色和可持续有机转化的一种有前途的方法。但是，由于过度依赖基于贵金属配合物的光敏剂，因此该方案受到很大限制。在这项工作中，我们首先报道了新设计的基于酰亚胺的共轭聚合物纳米片，作为无金属的异质光催化剂，用于有效的可见光驱动的氧活化。通过将per核与三嗪和庚嗪嵌段结合，可以合成具有宽光响应，深价带能级和出色的氧活化性能的超薄聚酰亚胺纳米片。该聚合物光催化剂在室温下在可见光照射下对胺氧化表现出优异的光催化活性。由于发现N-苄基苯甲二胺是唯一产物，因此转化率高达99％，选择性接近100％。250 mmol g的转化率^-1 h ^-1比代表性的聚合物光催化剂和基于金属氧化物的半导体高两个数量级。