文献类型：期刊文献

英文题名：A flexible polycyclic chemosensor for simultaneous discernment of Ni2+and Cd2+depending on distinct coordination modes

作者：Chen, Ziyu[1,2];Long, Qianxin[1,2];Li, Wen[1,2];Zhang, Zhiyun[1,2];Su, Jianhua[1,2];Guo, Lifang[1,2]

机构：[1]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Joint Int Res Lab Precis Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2025

卷号：332

外文期刊名：SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY

收录：;EI(收录号：20250617839196);WOS:【SCI-EXPANDED(收录号:WOS:001425245400001)】；

基金：We are thankful for the financial support from the NSFC/China (22004036, 22474039).

语种：英文

外文关键词：Fluorescence; Chemosensors; Heavy metal ions; Coordination mechanisms

摘要：Herein, we present a paradigm of a flexible molecular system for simultaneous discernment of Ni2+ and Cd2+, depending on distinct chemical coordination manners. By incorporating two functional pyridine groups at different positions on the flexible DPAC framework (9,14-diphenyl-9,14-Dihydrodibenzo [a,c]phenazine), two derivatives are prepared as 27Py-DPAC and 36Py-DPAC. The results show that 27Py-DPAC can chemically coordinate with Ni2+ (intermolecular coordination) and Cd2+ (intramolecular coordination), generating fluorescence turn-off and -on behaviors, respectively. The key factors leading to the different coordination ways are the ionic radius and the substituted positions of pyridine groups. Demonstrably, 36Py-DPAC can respond to Ni2+ abiding by the principle of the 27Py-DPAC sensor, but it cannot sense Cd2+ because of the difficulty in forming an effective intramolecular coordination resulted from the large distance between two nitrogen atoms on pyridine and the central heterocyclic ring. Based on the ionic response properties of the two compounds, logic circuits were developed to simulate logical operations and facilitate ion detection. This research expands the applicability of flexible polycyclic conjugated molecules in chemical sensing and underscores the influence of different modification sites of functional groups on ion binding mechanisms.