Hydro/Solvothermal Synthesis, Structures and Properties of Metal-Organic Frameworks Based on S-Block Metals

<p>Carbon dioxide removal from flue gases of power plants is critical for reduction of greenhouse gas emissions implicated in global warming. Metal Organic Frameworks (MOFs) promising potential applications in carbon dioxide capture due to their unique structural properties such as high porosity and high thermal stability. These MOFs have application in separation processes and gas storage. By the assembly of the organic ligands and metal oxide clusters, porous MOFs can be synthesized. The use of s-block metals such as calcium, magnesium and rubidium in porous materials is appealing because their ionic binding characters with organic ligands will general flexible MOFs. The bonding interaction of s-block metal centers with carboxylate oxygen atoms is mainly ionic in nature due to large differences in electronegativity. The s-block elements can form low density frameworks which could increase the gas uptake capacity of small molecules.</p> <p>This work focuses on synthesis of new metal organic frameworks (MOFs) using s-block metals. Different types of the carboxylic ligands were utilized for synthesis of MOFs. Four new calcium or rubdium metal organic frameworks, [Ca3(btc)2(H2O)12] (1) and [Ca2(btc)(pzc)(H2O)3] (2) (btc=benzene-1,3,5-tricarboxylate, pzc = pyrazine-2- carboxylate), [Ca(Hbtc)(H2O)]•H2O (6), and [Rb(Hbdc)] (7) have been synthesized using the hydro/solvothermal method and have been characterized using X-ray diffraction, IR, UV-vis, TGA and fluorescence analysis. The structures of compounds 1, 6 and 7are three-dimensional frameworks while that of compound 2 is a double layered network.</p>

Name thesis:degree_name

Master of Science

Discipline thesis:degree_discipline

Department of Chemistry

Year

2012

Author dc:creator

• Vakiti, Raj Kishore

Contributors dc:contributor

• Dr. Bangbo Yan (Director), Dr. Cathleen Webb, Dr. Yan Cao, Dr. Wei-Ping Pan

• rubidium
• x-ray diffraction
• Thermogravimetric Analyzer
• Chemistry
• Materials Chemistry
• Polymer Chemistry

Repository record dc:identifier

https://digitalcommons.wku.edu/theses/1168

OAI identifier oai:identifier

oai:digitalcommons.wku.edu:theses-2172