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Preparation and Photophysical Photochemical Properties of Novel Optical Materials

Author: LiuShiJun
Tutor: LiLei
School: Beijing University of Chemical Technology
Course: Physical and chemical
Keywords: Zinc-aluminum hydrotalcite Organic UV absorbers Intercalation and Assembly Photochemistry
CLC: O621.25
Type: Master's thesis
Year: 2006
Downloads: 108
Quote: 1
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Abstract


In this thesis, zinc aluminum hydrotalcite as the main organic UV absorbers object , system assembly conditions , product structure and UV absorption properties . By coprecipitation precursor ( main ) Zn - Al - CO 3 < / sub > LDHs with deionized water or ethylene glycol as the dispersion medium , the use of secondary ion exchange layer assembly is a sulfo yl - salicylic acid , 4 - hydroxy - 3 - methoxy cinnamic acid and 2 - hydroxy - 4 - methoxybenzophenone -5 - sulfonic acid , such as ultraviolet absorbers anion ( object ) intercalated LDHs . XRD, IR, TG-DTA test samples to characterize the structure , the use of photochemical properties of UV-VIS absorption spectrum of the product , and with the Gaussian - 98 package of ab initio molecular orbital method ( the HF/6-31G ) calculated molecular structure and charge distribution of the three organic UV absorber , reasonable guest molecules in the body layer arrangement , analyze its structure and photochemical behavior of the relationship . The results showed that temperature by controlling the ion exchange medium pH and organic anions can be successfully replaced the zinc aluminum LDHs precursor layer between CO 3 < / sub > 2 - < / sup > ion into the layer between have been assembled by the crystal structure of the inserted layer LDHs . As the organic ultraviolet absorber into the interlayer , not only the object with the body Laminates presence of static electricity and hydrogen bonding interactions , and is conducive to interaction between the object in the space of confinement , so that the UV absorption range of the assembled product . and significantly improve our ability , is a class of potential applications of inorganic - organic supramolecular complex structure of UV - absorbing material .

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Organic Chemistry general issues > Properties of organic compounds > Chemical properties of organic reactions
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