| Coumarin on this type of natural products in the molecular structure containing six-member heterocyclic and carbonyl functional groups at the same time, showing strong potential of fluorescence. Study found that by molecular modification, namely in coumarin matrix molecules covalent modification is introduced into other functional groups on the benzene ring chain, making the derivatives with different wavelength ultraviolet absorption and fluorescence emission wavelength, shows strong fluorescence properties. In addition the modified compounds can be reversible under the condition of the ultraviolet and visible light irradiation light polymerization, so coumarin groups with all kinds of polymer molecules can form a variety of series of "sensitive" hybrid materials, from the wavelength of ultraviolet light, the intensity, position and length of time, making the aggregate product show different physical and chemical properties to achieve the goal of effective control of molecular self-assembly.POMs is a kind of metal cluster compounds to oxygen, mainly by V, Mo, W, Nb, Ta, such as transition metal elements, has a wealth of physical and chemical properties, especially in terms of the charge transfer, having good electron delocalization and charge transport properties, through constructing conjugate type organic matter as the ligand with acid combination of organic-inorganic hybrid materials, more acid can be widely used in optical light, electric and magnetic properties, etc., is a kind of good nonlinear optical materials.In this kind of compound material, to accept electronic heteropoly acid anion as receptors, conjugated organic molecules as a donor to give electronic, thus can happen to the body-electron transfer between the receptor.Through organic covalent modification method to connect the various functional groups on acid molecules and construct the organic-inorganic hybrid materials can be fully shown much acid in different research in the field of application, make the analysis and research of the new acid functional materials more more detailed roundly.In this paper, on the one hand, was synthesized by the method of covalent modification based on Keggin type more coumarin acid acyl chloride derivatives hybrid molecular materials, for the product obtained by UV-Vis, FT-IR, NMR spectroscopy, ESI-MS (TOF) and elemental analysis confirmed that the structure, and by using ultraviolet spectroscopy, nuclear magnetic resonance spectroscopy (’H NMR and 2 D COSY NMR), gel permeation chromatography (GPC) and electron energy spectrum (XPS) on the compound in organic solution photopolymerization of a detailed study of the performance. Symmetrical type, on the other hand in traditional Anderson more acid modified research background, try to adopt new methods of asymmetric synthesis of hybrid molecules, two light molecules covalent modification with different sensitive characteristics on both sides of Mn-Anderson, more acid, to explore the optical performance of complex system, extending the more acid functional applications in optics, more meticulous and perfect.Based on the above research, much of this new type of acid base hybrid molecules in organic solution of photochromic properties for further study, confirmed that the polymerization and depolymerization of visible light under ultraviolet light can be light sensitive features. |
