Preparation of a new fluorescence nanochemosensor for Sn(II) ions by a modified nanoprecipitation method.

A new dialdehyde was designed and synthesized containing naphthalene groups, and then its macrocycle was prepared with 1,4-diaminobuthan. A modified nanoprecipitation method has been reported for the preparation of the nanoparticles. In this method, to obtain nanoparticles with small particle sizes, the nucleation rate was increased with decreasing of the mixing time. The organic nanoparticles were used for turn-off fluorescence response of low concentration of Sn ions over cations such as Cs, K, Na, Ba, Ca, Mg, Al, Pb Zn, Cu, Ni, Co, Fe, Mn, Ag, Cd, and Hg and ions in aqueous buffer solution. The limit of detection was 5.4 nM.