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Synthesis and Characterization of and Electroactive Organic Framework

Author: CuiYan
Tutor: ZuoTeng
School: Jilin University
Course: Polymer Chemistry and Physics
Keywords: Organic Frameworks Electrical activity Object Recognition
CLC: O633.21
Type: Master's thesis
Year: 2011
Downloads: 98
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Abstract

Porous organic framework materials since been found from the cause of great concern, which has a high specific surface area and porosity of its outstanding performance in the field of related application. Porous organic framework materials compared to other porous materials have better thermal stability and chemical stability, which stems from its network skeleton connected by a strong covalent bond. Synthesis of porous organic framework materials diversity is also an important reason for the rapid development of molecular design of pore shape and size of the holes, we can control the synthesis has the the expected skeleton structure and the nature of the hole material. So many advantages to enable more people to study and explore the broader value of the porous organic framework materials. Today, however, the porous organic framework materials confined in real-life production applications in gas storage, separation and catalysis. Therefore, we expect to use the network chemical principles through molecular design and synthesis of the organic framework porous materials has more potential value. As described herein, we use the the Yamamoto type Ullmann coupling reaction successfully synthesized a yield of nearly 100% of the mesoporous material of an electrically active organic skeleton JUC-Z2, this material with three (4 - bromophenyl) amine monomer in the organic nickel catalyst system since poly made. Through the characterization of its structure and thermal stability, JUC-Z2 not only has a high specific surface area and highly consistent with the microporous structure, and has good thermal stability. A low pressure of hydrogen, methane and carbon dioxide adsorption were measured in order to explore its potential value in the gas storage and separation applications, JUC-Z2 and calculate the corresponding adsorption enthalpy. The results show JUC-Z2 especially room temperature gas carbon dioxide capture, the reason has been discussed in Chapter. Then we tested near room temperature JUC-Z2 ability to identify carbon dioxide, JUC-Z2 have a strong identification with the enrichment of carbon dioxide in the temperature range near room temperature. JUC-Z2 organic skeleton most prominent feature is its fully connected by the N atom of the benzene ring, has a high density of π electrons form a conjugated π electrons delocalized system after doping the entire network. This makes JUC-Z2 into a conductive polymer material. The experiments show that the doped JUC-Z2 conductivity greatly increased, an increase of six orders of magnitude than the undoped. Moreover, this electrical activity experienced several partial voltage switching cycles still exist stably. I must mention JUC-Z2 center N atom of the skeleton structure unit active redox leaving material with a lively electrochemical properties. JUC-Z2 film platinum electrode in different supporting electrolyte cyclic voltammetry experiments found by observing coated JUC-Z2 not only has excellent electrochemical properties, and has a novelty for the differences in size of the guest molecules to select ability to identify the nature of the electrochemical adsorption. In summary, we have synthesized a new organic framework materials JUC-Z2 has a high specific surface area and porosity, with the conductive properties of the conductive polymer, more novel electrochemical performance. Outstanding properties make these breakthroughs traditional porous materials can only be applied to gas storage and separation JUC-Z2 may be applied in the guest molecule recognition, optical materials, molecular electronic devices, electromagnetic shielding materials and solar cells and other related areas.

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