Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (11): 935-941.

Article

### 聚甲基丙烯酸(N-羟基琥珀酰亚胺)酯的簇聚诱导发光研究

1. 上海交通大学化学化工学院 上海市电气绝缘与热老化重点实验室 上海 200240
• 投稿日期:2016-08-20 发布日期:2016-10-10
• 通讯作者: 袁望章, 张永明 E-mail:wzhyuan@sjtu.edu.cn;ymzsjtu@gmail.com
• 基金资助:

项目受国家自然科学基金（No.51473092）和上海市青年科技启明星计划（No.15QA1402500）资助.

### Clustering-Triggered Emission of Poly(N-hydroxysuccinimide Methacrylate)

Bin Xin, Luo Weijian, Yuan Wangzhang, Zhang Yongming

1. School of Chemistry and Chemical Engineering, Shanghai Key Lab of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240
• Received:2016-08-20 Published:2016-10-10
• Supported by:

Project supported by the National Natural Science Foundation of China (No. 51473092) and the Shanghai Rising-Star Program (No. 15QA1402500).

Nonconventional luminogens without classic aromatic or conjugated structures are attracting increasing interests owing to their fundamental importance and promising applications in diverse areas. Many of them even exhibit unique aggregation-induced emission (AIE) characteristics. The emission mechanism, however, remains under debate. Previously, we proposed the clustering-triggered emission (CTE) mechanism, namely the clustering of nonconventional chromophores and subsequent electron overlap to rationalize the emission behaviors of such luminogens. To further our understanding, herein, we designed and synthesized poly(N-hydroxysuccinimide methacrylate) (PNHSMA) without any aromatic structures, which was obtained by the radical polymerization of N-hydroxysuccinimide methacrylate (NHSMA) monomer in toluene at 65℃ utilizing azobisisobutyronitrile (AIBN) as initiator. And NHSMA was prepared through the elimination between N-hydroxysuccinimide (NHS) and methacryloyl chloride in the presence of triethylamine (Et3N). It is found that PNHSMA is virtually nonluminescent in dilute solutions (≤0.4 mg·mL-1) even at 77 K, but gets emissive in concentrated solutions (e.g. 40 mg·mL-1) with photoluminescence (PL) maxima at 434 and 485 nm at room temperature. Moreover, its solid powders emit intense blue light with multiple PL peaks upon UV irradiation, indicating its AIE nature and the formation of varying emission species. Further PL measurement of PNHSMA in dimethylformide (DMF) and DMF/acetone (good solvent/nonsolvent) mixtures duly verifies its AIE feature. Meanwhile, NHSMA monomer shows similar emission behaviors to those of PNHSMA, demonstrating concentration enhanced emission and AIE characteristics. In light of above results, it is assumed that NHSMA and its polymeric counterpart PNHSMA may share the similar emission mechanism. Single crystal structure of NHSMA reveals the conjugation of imide group and 3D intermolecular interactions of C=O…C=O (n-π, 3.072 Å), C=O…H-C (2.651, 2.642 Å) and C=O…C-H (3.099 Å). The emission of PNHSMA and NHSMA in concentrated solutions and solid states is thus ascribed to the clustering of imide and ester groups, which results in electronic interactions. The overlap of π and lone pair (n) electrons among C=O, N and O units, together with effective intermolecular interactions in the solid powders extend the conjugation and rigidify the molecular conformations, thus leading to boosted emissions. Such CTE mechanism might be well extended to other nonconventional systems and should be inspiring for the rational design of novel luminogens.