title: A novel polymeric chemosensor: dual colorimetric detection of metal ions through click synthesis.
abstract: A highly colored polystyrene derivative bearing side chain chromophores composed of dialkylanilino donor and cyano-based acceptor groups, prepared by atom-economic click postfunctionalization, displays the dual colorimetric detection behavior of several metal ions based on the specific interactions with different nitrogen atoms. Hard to borderline metal ions, such as Fe(3+) , Fe(2+) , and Sn(2+) , are always recognized by the dialkylanilino nitrogen atom, resulting in a decrease in the charge-transfer (CT) band intensity of the donor-acceptor chromophores. On the other hand, the recognition site of a soft metal ion of Ag(+)  is the cyano nitrogen atom due to the readily formed multivalent coordination, which produces a bathochromic shift of the CT band.
authors: Department of Organic and Polymeric Materials, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
authors: Yongrong
authors: Y
authors: Li
authors: Minoru
authors: M
authors: Ashizawa
authors: Satoshi
authors: S
authors: Uchida
authors: Tsuyoshi
authors: T
authors: Michinobu
mesh_terms: D000480:Alkynes / Q000737:chemistry; D057930:Click Chemistry; D003124:Colorimetry / Q000295:instrumentation / Q000379:methods*; D005030:Ethylenes / Q000737:chemistry; D008670:Metals / Q000032:analysis*; D015394:Molecular Structure; D009570:Nitriles / Q000737:chemistry; D011137:Polystyrenes / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: D000480:Alkynes; D005030:Ethylenes; D008670:Metals; D009570:Nitriles; D011137:Polystyrenes; C003393:tetracyanoethylene