The ability to utilize recent developments in coordination chemistry has given way to the formation of metal-organic frameworks. One framework in this category uses polyoxometalate anions (POMs) consisting of transition metal cations surrounded by oxo anions, linked through organic ligands. These two building blocks allow for the precise formation of nano-sized compounds bridging the gap between nanotechnology and traditional synthesis. The variation in the framework’s pore size is directly a result of the organic ligands and its individual structure. The formation of a tetrahedral organic ligand is the main focus of this project and how it may be used to self-assemble into a three dimensional POM organic framework (POMOF). This framework will have the redox capabilities of the POM along with the tunable structure from the organic ligand. The synthesis of the starting tetrahedral organic ligand was accomplished through reacting tin(IV) chloride with dibromobenzene, resulting in (p-BrPh)4Sn. Following the synthesis of this compound the Sonagashira coupling was used to extend the arms of the tetrahedral ligand with added rigidity through the addition of an acetylene subunit, followed by another Sonagashira addition with p-bromobenzoate. After each step the product was purified using flash chromatography and characterized using NMR spectroscopy. Future work includes an amidation between the ester and TRIS, which will allow coordination of the ligand to the POM, forming the POMOF through self-assembly.

Nanosized organometallic building block synthesis for the formation of a polyoxometalate-based framework

249th National Meeting (2015)

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