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Upon the addition of Hg<jats:sup>2<\/jats:sup><jats:sup>+<\/jats:sup> ions, it displayed a rare staged response: the emission spectra of <jats:bold>C1<\/jats:bold> first showed an apparent red\u2010shift, followed by a dramatic decrease. To investigate the sensing mechanism, control compounds <jats:bold>C2<\/jats:bold> with the same phenanthroimidazole unit and <jats:bold>C3<\/jats:bold> with the same carbamodithioate functionality were synthesized. On comparison, the first step sensing process was ascribed to decreasing photoinduced electron transfer on the coordination of Hg<jats:sup>2<\/jats:sup><jats:sup>+<\/jats:sup> with the lone pair electrons of the nitrogen atom on the phenanthroimidazole ring. The affinity of Hg<jats:sup>2<\/jats:sup><jats:sup>+<\/jats:sup> and the carbamodithioate unit with four sulfur atoms then induced changes in intramolecular charge transfer efficiency and the second step fluorescent response.<\/jats:p>","DOI":"10.1002\/bio.3205","type":"journal-article","created":{"date-parts":[[2016,9,20]],"date-time":"2016-09-20T23:06:39Z","timestamp":1474412799000},"page":"509-516","source":"Crossref","is-referenced-by-count":4,"title":["Carbamodithioate\u2010based fluorescent chemosensor for Hg(II): a staged response approach and investigation into the sensing mechanism"],"prefix":"10.1002","volume":"32","author":[{"given":"Xiaohong","family":"Cheng","sequence":"first","affiliation":[{"name":"Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science  Xiangyang People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhicheng","family":"Zhong","sequence":"additional","affiliation":[{"name":"Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science  Xiangyang People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tingting","family":"Ye","sequence":"additional","affiliation":[{"name":"College of Chemical Engineering and Food Science Hubei University of Arts and Science  Xiangyang People's Republic of China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bingjie","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Chemical Engineering and Food Science Hubei University of Arts and Science  Xiangyang People's Republic of 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