Triazine-Containing Pyridinium Organic Polymer Based\non 4‑Amino-1,8-naphthalimide Troger’s Base for\nSelective Fluorescent Sensing of Organoarsenic Feed Additives in Water

A new triazine containing\npyridinium organic polymer (<b>TB-Py-COP</b>) based on 4-amino-1,8-naphthalimide\nTröger’s base\nis developed and employed as a fluorescent chemosensor for selective\nsensing of organoarsenic feed additives in water. <b>TB-Py-COP</b> was readily synthesized by reacting “V-shaped” bis-[<i>N</i>-(4-pyridyl)methyl)]-9,18-methano-1,8-naphthalimide-[<i>b,f</i>][1,5]diazocine with cyanuric chloride in DMF at 100\n°C for 3 days. <b>TB-Py-COP</b> exhibited a strong fluorescence\nemission in water and displayed selective, reversible fluorescence\nsensing responses for the roxarsone feed additive at the nanomolar\n(19 nM) level of sensitivity. The Stern–Volmer quenching constant\n(<i>K</i><sub>SV</sub>) was determined to be 1.4 ×\n10<sup>4</sup> M<sup>–1</sup>. The selective sensing of roxarsone\nwas further demonstrated in competitive environments, lake water,\nand buffer solutions.