Citation: Long-Qi Yang, Xiao-Ming Jiang, Fa-Kun Zheng, Guo-Cong Guo. Unconventional configuration of excimer in luminescent aggregates uncovered by in situ photo-difference electron density[J]. Chinese Journal of Structural Chemistry, ;2026, 45(4): 100846. doi: 10.1016/j.cjsc.2025.100846 shu

Unconventional configuration of excimer in luminescent aggregates uncovered by in situ photo-difference electron density

Excimers host an important role in nature and modern industrial applications; however, a precise understanding regarding their configuration remains elusive owing to the difficulty in observing their formation in situ. Here we present an experimental scheme enabling in-situ visualization of structural evolution of molecules through photo-difference electron density. Application to pyrene crystals revealed an unanticipated excimer formation pathway. By observing the photo-induced molecular shift and rotation, we discovered the unconventional T-shaped configuration of pyrene excimers, which consists of more closely adjacent nonparallel molecules tending towards a perpendicular orientation, rather than the conventional sandwich configuration formed by adjacent parallel molecules. The results help demystify the molecular orientation and configuration associated with excimer discovered decades ago, and shed light on revealing fundamental mechanism of excimers in the fields of biomolecule detection, photovoltaics, and organic electronics.
- Luminescent aggregates,
- Excimer,
- In-situ electron density,
- Noncovalent interactions,
- Light-induced structural evolution
1. [1]
  Junjie Duan , Dan Chen , Long Chen , Shuying Li , Ting Chen , Dong Wang . 2D hexagonal tessellations sustained by Br···Br/H contacts: From regular to semiregular to k-uniform tilings. Chinese Chemical Letters, 2025, 36(3): 110445-. doi: 10.1016/j.cclet.2024.110445
2. [2]
  Zhenzhu Wang , Chenglong Liu , Yunpeng Ge , Wencan Li , Chenyang Zhang , Bing Yang , Shizhong Mao , Zeyuan Dong . Differentiated self-assembly through orthogonal noncovalent interactions towards the synthesis of two-dimensional woven supramolecular polymers. Chinese Chemical Letters, 2024, 35(5): 109127-. doi: 10.1016/j.cclet.2023.109127
3. [3]
  Jia Peng , Guo-Ping Luo , Chao Wu , Congyang Wang . Visible light-induced deuteration of arenes via thianthrenation. Chinese Chemical Letters, 2025, 36(8): 111255-. doi: 10.1016/j.cclet.2025.111255
4. [4]
  Yan-Jiang Li , Shu-Lei Chou , Yao Xiao . Detecting dynamic structural evolution based on in-situ high-energy X-ray diffraction technology for sodium layered oxide cathodes. Chinese Chemical Letters, 2025, 36(2): 110389-. doi: 10.1016/j.cclet.2024.110389
5. [5]
  Yican Zhang , Jiangli Sun , Shasha Li , Xueying Ren , Jiana Jing , Jiatong Zhang , Yujie Chen , Minghua Zhou . Interlaced nanosheet-structured Co₃O₄/Ti anode for efficient chlorine evolution for in-situ environmental remediation. Chinese Chemical Letters, 2026, 37(5): 111857-. doi: 10.1016/j.cclet.2025.111857
6. [6]
  Huifang Ma , Tao Xu , Saifei Yuan , Shujuan Li , Jiayao Wang , Yuping Zhang , Hao Ren , Shulai Lei . Interlayer interactions and electron transfer effects on sodium adsorption on 2D heterostructures surfaces. Chinese Chemical Letters, 2025, 36(8): 110219-. doi: 10.1016/j.cclet.2024.110219
7. [7]
  Shengyong Liu , Hui Li , Wei Zhang , Yan Zhang , Yan Dong , Wei Tian . Multiple host-guest and metal coordination interactions induce supramolecular assembly and structural transition. Chinese Chemical Letters, 2025, 36(6): 110465-. doi: 10.1016/j.cclet.2024.110465
8. [8]
  Ying Zhao , Yao He , Jian-Xin Yang , Wen-Jie Liu , Dan Tian , Francisco Aznarez , Le-Le Gong , Li-Long Dang , Lu-Fang Ma . Controllable self-assembly and photothermal conversion of metalla[2]catenanes induced by synergistic effect of free radicals and stacking interactions. Chinese Chemical Letters, 2025, 36(12): 111460-. doi: 10.1016/j.cclet.2025.111460
9. [9]
  Ziang Shang , Heyu Sui , Zeyi Huang , Xueting Feng , Guanzhen Chen , Jiena Weng , Yu Xiong , Yaqiong Su , Yunhu Han . Mo, B-induced local structure and electron redistribution of RuO₂ for efficient acidic oxygen evolution. Chinese Chemical Letters, 2026, 37(6): 111016-. doi: 10.1016/j.cclet.2025.111016
10. [10]
  Manlin Lu , Sheng Liao , Jiayu Li , Zidong Yu , Ningjiu Zhao , Zuoti Xie , Shunli Chen , Li Dang , Ming-De Li . Face-to-face π-π interactions and electron communication boosting efficient reverse intersystem crossing in through-space charge transfer molecules. Chinese Chemical Letters, 2025, 36(6): 110066-. doi: 10.1016/j.cclet.2024.110066
11. [11]
  Wei-Lei Zhou , Fanxu Zeng , Yong Chen . Light-fueled multicolor luminescent supramolecular driver enabled by cucurbituril-mediated allostery. Chinese Chemical Letters, 2026, 37(6): 112486-. doi: 10.1016/j.cclet.2026.112486
12. [12]
  Yi Liu , Zhe-Hao Wang , Guan-Hua Xue , Lin Chen , Li-Hua Yuan , Yi-Wen Li , Da-Gang Yu , Jian-Heng Ye . Photocatalytic dicarboxylation of strained C–C bonds with CO₂ via consecutive visible-light-induced electron transfer. Chinese Chemical Letters, 2024, 35(6): 109138-. doi: 10.1016/j.cclet.2023.109138
13. [13]
  Qinghong Zhang , Qiao Zhao , Xiaodi Wu , Li Wang , Kairui Shen , Yuchen Hua , Cheng Gao , Yu Zhang , Mei Peng , Kai Zhao . Visible-light-induced ring-opening cross-coupling of cycloalcohols with vinylazaarenes and enones via β-C-C scission enabled by proton-coupled electron transfer. Chinese Chemical Letters, 2025, 36(2): 110167-. doi: 10.1016/j.cclet.2024.110167
14. [14]
  Zhipeng Wan , Hao Xu , Peng Wu . Selective oxidation using in-situ generated hydrogen peroxide over titanosilicates. Chinese Journal of Structural Chemistry, 2024, 43(6): 100298-100298. doi: 10.1016/j.cjsc.2024.100298
15. [15]
  Yu-Hui Zhang , Ye Tian , Xianliang Sheng , Chen-Shuang Liu , Lu-Qiang Wei , Jie Wang , Yong Chen . Construction of a black phosphorous-based noncovalent multiple nanosupramolecular assembly for synergistic targeted photothermal and chemodynamic therapy. Chinese Chemical Letters, 2025, 36(4): 110193-. doi: 10.1016/j.cclet.2024.110193
16. [16]
  Xindi Yang , Cunli Wang , Dongdong Wang , Haijuan Qin , Kuoxi Xu , Guangyan Qing . High efficiency detection of Zn²⁺ through the improved electron density of aromatic π-conjugated bridges. Chinese Chemical Letters, 2026, 37(4): 111215-. doi: 10.1016/j.cclet.2025.111215
17. [17]
  Jiajia Lv , Jie Gao , Hongyu Li , Zeli Yuan , Nan Dong . Rational design of hydroxytricyanopyrrole-based probes with high affinity and rapid visualization for amyloid-β aggregates in vitro and in vivo. Chinese Chemical Letters, 2024, 35(5): 108940-. doi: 10.1016/j.cclet.2023.108940
18. [18]
  Lulu Cao , Yikun Li , Dongxiang Zhang , Shuai Yue , Rong Shang , Xin-Dong Jiang , Jianjun Du . Engineering aggregates of julolidine-substituted aza-BODIPY nanoparticles for NIR-II photothermal therapy. Chinese Chemical Letters, 2024, 35(12): 109735-. doi: 10.1016/j.cclet.2024.109735
19. [19]
  Guan-Nan Xing , Di-Ye Wei , Hua Zhang , Zhong-Qun Tian , Jian-Feng Li . Pd-based nanocatalysts for oxygen reduction reaction: Preparation, performance, and in-situ characterization. Chinese Journal of Structural Chemistry, 2023, 42(11): 100021-100021. doi: 10.1016/j.cjsc.2023.100021
20. [20]
  Peng Jia , Yunna Guo , Dongliang Chen , Xuedong Zhang , Jingming Yao , Jianguo Lu , Liqiang Zhang . In-situ imaging electrocatalysis in a solid-state Li-O₂ battery with CuSe nanosheets as air cathode. Chinese Chemical Letters, 2024, 35(5): 108624-. doi: 10.1016/j.cclet.2023.108624

Get Citation

PDF

XML

Metrics

PDF Downloads(0)
Abstract views(1)
HTML views(0)

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Address：Zhongguancun North First Street 2,100190 Beijing, PR China Tel: +86-010-82449177-888

DownLoad: Full-Size Img PowerPoint

Return