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Syntheses?Structures And Properties Of Metal-Organic Frameworks Constructed By Aromatic Tri-Carboxylic Acids And Triazole Derivatives

Posted on:2016-01-06Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y ZhangFull Text:PDF
GTID:2311330485959567Subject:Chemistry
Abstract/Summary:PDF Full Text Request
Because of the outstanding characters, Metal-Organic Frameworks(MOFs)increasingly becoming one of the hot spots in the fields of chemical, materials, energy,and catalysis. Design and synthesis of coordination polymers which possess novel structures are the basis of research its properties and potential applications. Aromatic tri-carboxylic acids and tri-azoles derivatives are not only possess excellent coordination ability and vary of coordination modes, but also can easily be modified by many groups. So they have significant advantages in construct and research of MOFs which aims to function as the guidance.This paper briefly introduced the research status of MOFs which construct by aromatic tri-carboxylic acids or tri-azoles derivatives. Then, by regulating various reaction conditions under solvothermal reaction, sixteen compounds were synthesized and structurally characterized. The main work of this paper is concluded as follows:1, Adopting 4,4',4''-benzene-1,3,5-triyl-tribenzoic acid(H3BTB) as the main ligand, 1,2,4-triazole(HTRZ) and 4-amino-1,2,4-triazole(ATRZ) as the auxiliary ligand, respectively. As a result, four Co-MOFs were synthesized and provided with different structures, however, only H3 BTB is coordinated on CoII in compound 1.Then elemental analyses, X-ray powder diffraction patterns(PXRD) and thermogravimetric analyses(TGA) were performed for 1-4. Magnetic measurements indicate that antiferromagnetic interactions exist within compound 3.2, Eight MOFs(5-12) were synthesized by 3,5-Bis-[2-(4-carboxy-phenoxy)-ethoxy]-benzoic acid(H3L) ligand which self-assembly with the transition metallic and rare earth metallic salts,respectively. There are four transition metallic-based compounds and four lanthanide-based compounds. Then elemental analyses, PXRD and TGA were performed for them. The excellent solvents stability of 3D compound5 is confirmed via soaking sample 5 in common organic solvents for 12 hours and performing the PXRD of resulting sample. Magnetic measurements indicate that antiferromagnetic interactions exist within compound 5. There are two characteristic emission peaks of Dy(III) in the range of visible light when measured the fluorescence of compound 12. Moreover, the absorption and absorption kinetics ofmethylene blue(MB) in aqueous solution were carried out on compound 10. The investigation indicate that compound 10 possesses strong absorption to MB molecule,and the absorption process can be described by the pseudo-second-order kinetic model.3, Using H3 L as the main ligand, HTRZ and ATRZ as the auxiliary ligand respectively, four MOFs were synthesized. Elemental analyses, PXRD and TGA were performed for them. The luminescence responses to organic small molecules of compound 14 have been studied via the fluorescence spectrum and the result reveals that this compound is able to recognize nitrobenzene. Furthermore, the absorption of methylene blue(MB) in aqueous solution of compound 14 is researched using the UV spectrum. The result confirms that 14 has stronger and faster absorption ability for MB molecule than compound 10, and the absorption process also obeys the pseudo-second-order kinetic model.
Keywords/Search Tags:metal-organic frameworks, tri-carboxylic acids, triazole derivatives, magnetic properties, methylene blue(MB) absorption
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