Formation And Properties Of Silver Ion Nanoparticles And Coordination Copolymers

Supramolecular chemistry has become a hot research field by constructing simple molecular units to form structures of various scales and high order.The non-covalent bonds in supramolecular polymers have lower binding energy,reversibility and dissociation compared to the covalent bonds in conventional polymers.Therefore,it has a broad application prospect in many fields such as optical nanodevices,drugs,gene delivery,sensors and cellular imaging.For the past few years,Some small organic molecules have been used in the construction of supramolecular polymer sensors because of their specific optical properties.In this paper,four compounds were designed and synthesized using pyrene and triphenylamine as fluorescence signal groups for the specific identification of environmental pollutants ClO^-and Ag⁺.The specific content is as follows:First,silver nanoparticles(PY-LA@Ag NPs)were generated in situ by using light and a pyrene derivative as a capping agent.The PY-LA@Ag NPs showed recognition of ClO^-through visual color change and fluorescence"turn on"reaction in water.The strong oxidizing property of ClO^-causes the breakage of the Ag-S bond,which makes PY-LA@Ag NPs disintegrate and increase the fluorescence,so as to realize the specific recognition of ClO^-.At the same time,the field visual detection of hypochlorite,and the hypochlorite environment is easily monitored in real time by smartphone APP.Second,Triphenylamine derivatives(TPA-PY)were synthesized by Knoevenagel condensation reaction.The probe TPA-PY has a weak fluorescence in aqueous solution.When mixed with L-GSH and Ag⁺,it forms an ordered and stable spiral assembly and emits bright yellow fluorescfence.The assembly process was investigated by DLS and unlabeled detection system,and the results showed that the ternary assembly was stable and firm.TPA-PY can specifically identify Ag⁺under the synergistic action of L-GSH,and realize efficient recovery of Ag⁺in electronic wastewater by ICP-MS.Third,Phenylboric acid modifies triphenyamine TPA-PPB and TPA-OPB was synthesized.TPA-PPB existed as a monomer in 1%V_methanolsolution,but it still existed as a monoer when NAC or Ag⁺were added respectively.TPA-PPB aggregated when NAC and Ag⁺were mixed together.TPA-PPB forms macromolecular with NAC and Ag+through the electrostatic interaction of positive and negative charges and the coordination between sulfhydryl groups and metals.TPA-PPB achieves specific recognition of Ag⁺with the synergistic effect of NAC without interference from other ions,while TPA-OPB has no obvious phenomenon.An“on”fluorescent probe for Ag⁺detection was successfully designed and synthesized.