Metal–organic frameworks (MOFs) are a new type of porous materials with diverse potential applications such as gas storage or separation. Compared to traditional porous materials such as zeolites, MOFs have a larger surface area and it is easier to control the structure and pore size of MOFs. MOFs can be prepared by the self-assembly of metal ions with organic linkers to form a low-density framework. The solvent that occupies the pore spaces in MOFs can be removed by solvent exchange and heating. For some structures the integrity of the framework can be retained after careful removal of the guest species. The remaining empty pores within the 3D structure can then adsorb other guest molecules.
The synthetic strategy used in this thesis work is to design a heterometallic framework. It provides a new way to synthesize zeolite-type frameworks. In the first part, we selected BTC (1,3,5-benzenetricarboxylate) as our ligand to link with two In3+ ions and a M3(OH) metal cluster. We were able to synthesize a series of isostructural MOFs in which pendant trimeric metal clusters are covalently attached to the zeolite framework.
In the second part of our studies, we apply our mixed-metal strategy to create new heterometallic clusters. We successfully synthesized five types of indium-containing clusters by combining indium with the s-, d- and f-block elements such as Mg2+, Co2+, and Nd3+ . The ratio between heterometals for the same nuclearity cluster can be different. The porosity of these materials has been demonstrated by gas sorption studies.
|Commitee:||Bu, Xianhui, Derakhshan, Shahab, Li, Lijuan|
|School:||California State University, Long Beach|
|Department:||Chemistry and Biochemistry|
|School Location:||United States -- California|
|Source:||MAI 51/04M(E), Masters Abstracts International|
|Subjects:||Inorganic chemistry, Organic chemistry|
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