Analyzing The Influence Of Photon Scattering On The Optical Properties Of Porphyrin Nanomaterials By Using PRS2 Method

With the continuous development of nanomaterials,porphyrins and porphyrin derivatives play an important role in nanomaterials.Porphyrin is a good photosensitizer,widely used in photocatalysis and enzyme catalysis centers.Porphyrin that cyclic highly conjugated macrocyclic structure is connected by four pyridine units through a methine bridge,which is a strongπ-πconjugate interaction in the molecule.Many scientists use this feature of porphyrin to apply nanomaterials self-assembly which assembles many assemblies of different morphologies,sizes.In this paper,UV-Vis,fluorescence,and PRS2 spectra are used to analyze the optical properties of four different morphology zinc porphyrins and three different morphology copper porphyrin assemblies,zinc porphyrin self-assembly process,zinc porphyrin disassembly process,and visible light irradiation zinc porphyrin assembly.Analysis of optical properties of phyrin monomer,wire morphology zinc porphyrin assembly and elliptical morphology copper porphyrin assembly.The mainly research content and results are as follows:（1）Using NiSO₄·7H₂O,K₂Cr₂O₄and fluorophores with different emission wavelengths as measurement materials to accurately correct the UV-Vis and fluorescent instruments,calculating the true effective path length and G-factor constant for excitation and emission.The experimental results show that the effective path lengths of excitation and emission are0.443,0.510 cm,however G-factor constant is the spectral value between 300 nm and 700nm.（2）The optical properties of four zinc porphyrin assemblies and three copper porphyrin assemblies were studied by UV-Vis,fluorescence,and PRS2 spectroscopy.The experimental results showed that the UV absorption wavelength and fluorescence emission wavelength of different metalloporphyrin assemblies were different.PRS2 spectroscopy technology can quantitatively resolve the photon extinction,absorption,scattering and scattering-extinction signal-to-noise ratio（SER）spectra of porphyrin materials,which calculates the cross-sectional area of photon extinction,absorption,scattering,but the largest scattering-extinction signal-to-noise ratio（SER）shape is 60%of hexagonal rods and tetragonal rods,only 28%and 20%are nanowires and nanodiscs,respectively.（3）The optical properties of the self-assembly process of zinc porphyrin were studied by UV-Vis,fluorescence,and PRS2 spectra.The experimental results showed that the photon absorption at 418 nm of the monomer Zn TPy Ps decreased with the increase of Zn TPy P aggregates,which the kinetic curve can be seen that the equilibrium state no longer changes after 35 h.The 610 nm area allocated to Zn TPy Ps aggregation at 419,446,459,574 nm increases with the increase of Zn TPy P aggregation.It can be seen from the kinetic curve that the equilibrium state does not change after 23 h and the monomer zinc porphyrin gradually decreases.Small,the accumulation of zinc porphyrin gradually increases.PRS2-VV 414,449,462,575 and 614 nm and PRS2-VH 414,439,456,574 and 614 nm exhibit exponential growth in 3-10 h,which the intensity basically reaches its approximate equilibrium state after10 h.The monitoring sensitivity of the self-assembled PRS2 spectrum of the porphyrin fluorophore is better than that of UV-vis and the scattering of photons is directly observed to change with the change of the porphyrin molecule.（4）The optical properties of the disassembly process of zinc porphyrin assembly induced by HCl and DMF were studied by UV-Vis,fluorescence,and PRS2 spectroscopy.The experimental results show that the disassembly process does not immediately turn the assembly into a porphyrin monomer,but starts from the edge of the assembly.Slowly disassemble to the final porphyrin monomer.（5）The optical properties of porphyrin monomers,zinc porphyrin assemblies and copper porphyrin assemblies were studied by UV-Vis,fluorescence,and PRS2 spectroscopy under different light irradiation.The experimental results showed that the visible light irradiation under HCl as a solvent had a negative effect on porphyrin monomers.The porphyrin monomer was not completely decomposed,however the porphyrin monomer was gradually decomposed in about 3 h after visible light irradiation in DMF as a solvent and basically decomposed in about 3.5 h.Ascorbic acid was used as an introducing agent and water was used as a solvent to decompose the zinc porphyrin assembly at about 160 min and 20 h.The main component of the solution was water.The copper porphyrin assembly is basically decomposed in about 6 h under light irradiation with water as the solvent.Proving that the optical properties of porphyrin monomer and porphyrin assembly are stable under light irradiation and can be maintained for a period of time...