A polymeric chemosensor for Fe3+ based on fluorescence quenching of polymer with quinoline derivative in the side chain Najun Li, Qingfeng Xu, Xuewei Xia, Lihua wang, Jianmei Lu∗, XiaoweiWen Key Laboratory of Organic Synthesis of Jiangsu Province, School of Chemistry and Chemical Engineering, Suzhou University, Su Zhou, Jiangsu 215123, PR China