Double Responsivity And Transformation Based On Pyridyl Ethylene Coordination Polymer

Coordination polymers are an organic-inorganic hybrid compound formed by an organic ligand that can provide a pair of electrons and a metal ion that can accept electrons through a coordination bond.It has one-dimensional(1D),two-dimensional(2D),three-dimensional(3D)and infinite network structures in dimension.The coordination polymer has excellent properties such as porosity,large specific surface area,modification,and the well thermal stability.The photoresponsive coordination polymer refers to a type of coordination in which a photoreactive group(azobenzene,diarylethene,spiropyran,disulfide bond,etc.)undergoes chemical reaction after absorption of light energy.Light as an exogenous stimulus has spatial controllability and instantaneous properties,Ability to transfer energy to the system,initiat the reaction to occur need not contact the material.Light has the tunability of various parameters such as wavelength,intensity,polarization,etc.At the same time,the photochemical reaction is considered as a green synthesis one,since the photon does not leave a residue,and the reaction could be carried out at ambient temperature.This makes the construction of photoreactive coordination polymer particularly attractive.Ozone has proven to be a powerful oxidizing reagent for chemical reaction under mild conditions.Initially used for routine characterization of lipids and natural polymers,at present,it is applied to selective oxidation of olefinic bonds,thus enableing regio-specific formation of aldehydes,ketones or carboxylic acids.The reaction involves the metastable intermediates(1,2,4-trioxolane).Due to their low stability,trioxolane rings could be treated to form aldehyde moieties or carboxylic acids under mild reductive or oxidative conditions,respectively.In this experiment,a regulation rod-like shape Zn-bpe coordination polymer was synthesized by the spray method.The double-response coordination polymer was successfully synthesized by changing the reaction concentration,the dropping sequence and the bridging agent.Firstly,the photoresponse experiments show that the[2+2]photopolymerization reaction was successful by 1H NMR spectra characterization,accompanied by the single crystal-single crystal transition for various illumination time.Secondly,the ozone response experiments show that the double bond was oxidation to form carboxyl and aldehyde by 1H NMR spectra characterization,accompanied by single crystal-single crystal under different conditions of ozone oxidation time.In recent years,efforts have been made to develop highly active multiphase photocatalysts.Among various semiconductor metal oxides used for photocatalysis,ZnO has become the most widely studied photocatalyst due to its low toxicity,wide band gap(3.37 eV),high light stability and high efficiency.the rod-like shaped Zn-bpe coordination polymer and the coordination polymer after photoresponse and ozone response were burn at different annealing temperatures to preparation ZnO or C@ZnO catalysts with different catalytic performance,respectively.the morphology,elemental composition,crystal structure,thermal stability and photocatalytic properties of the catalyst were characterized and analyzed by SEM,XRD,TG,UV-Vis and PL spectra.