Uncoordinated‐substituents‐induced zinc(II) coordination polymers exhibiting multifunctional fluorescent sensing activity for cations, anions and organochlorine pesticides

• Published in: Zeitschrift für anorganische und allgemeine Chemie (1950) 2021-06, Vol.647 (12), p.1284-1293
• Main Authors: Chi, Jie, Zhong, Baoqi, Li, Yan, Shao, Pengpeng, Liu, Guocheng, Gao, Qiang, Chen, Baokuan
• Format: Article
• Language: English
• Subjects: Acids; Anions; Carboxylic acids; Coordination polymers; Fluorescence; Ions; multi-torsion amide ligand; multifunctional fluorescence sensing; Naphthalene; Pesticides; Polymers; uncoordinated-substituents; Zinc; Zinc coordination; Zn-based coordination polymer
• ISSN: 0044-2313; 1521-3749
• DOI: 10.1002/zaac.202100049

In order to explore the influence of carboxylic acid substituents on the structures and properties of coordination polymers, three new coordination polymers (CPs) of [Zn2(L)2(IP)2] (1), [Zn(L)(HIP)] ⋅ 3H2O (2) and [Zn(L)(NIP)] ⋅ H2O (3) [H2IP=isophthalic acid, H2HIP=5‐hydroxyisophthalic acid, H2NIP=5‐nitroisophthalic acid] were designed and synthesized under hydrothermal conditions with a multi‐torsion‐centered N‐donor ligand of N,N′‐bis(4‐methylenepyridin‐4‐yl)‐1,4‐naphthalene dicarboxamide (L). All three CPs have similar 4,4‐connected two‐dimensional structures exhibiting different structural details, which is induced by uncoordinated‐substituents and discussed systematically. The title CPs 1 and 2 show multi‐functional fluorescent responses towards metal ion (Fe3+), anions (MnO4−, CrO42− and Cr2O72−) and pesticide (2,6‐dichloro‐4‐nitroaniline). The corresponding detection limits are 6.1×10−5 M−1, 3.7×10−4 M−1, 5.5×10−4 M−1, 3.0×10−4 M−1 and 6.7×10−5 M−1 for CP 1, 2.8×10−5 M−1, 4.1×10−4 M−1, 3.0×10−4 M−1, 4.1×10−4 and 2.8×10−5 M−1 for CP 2.