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Porous coordination polymer design and synthesis , structure and characterization

Author: WeiWei
Tutor: ChenSanPing；GaoShengLi
School: Northwestern University
Course: Materials Chemistry
Keywords: Structural analysis micro-porous coordination complex adsorption enthalpy high pressure adsorption transition metal complexes lanthanide complexes
CLC: O634
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 0
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Abstract


Hydrogen becomes the first choice of green energy because it is pollution-free. However, efficient hydrogen storage material is a prerequisite for wider use of hydrogen energy. Since leading the meta-organic frameworks (MOFs) materials into adsorption studies, MOFs have been considered as promising candidates due to exceptionally high porosity, uniform but tunable pore size, and well-defined hydrogen Binding sites. MOFs are relatively easy to synthesize with affordable starting materials and straight for ward techniques.Herein we used the ligands 3,5-bis (3-pyridy1)-1H-1.2,4-triazole,3,5-bis (4-pyridyl)-1H-1,2,4-triazole,3.3’,4,4’-biphenyltetracarboxylic acid, and Diphenyl Ether 4,4’-Dicarboxylic Acid construct microporous coordinate complexes. We finally got two serials of coordination polymers 1-6 based on transition metal and lanthanide metal, which exhibited interesting structure diversity.The stabilities of complexes 1-6 losing the guest molecular are found at this work. All the complexes could stably lose the guest water molecular while heated to 250 degree at least, the complexes 5 and 6 could be stable at more than 400 degree.Here we study the adsorption properties of complexes 1-6 finally, nitrogen and hydrogen were used to test their BET areas and the hydrogen adsorption capacity. The complexes 2 and 3 show the relative high BET areas and capacities of hydrogen adsorption. Therefore, the high pressure hydrogen adsorption and measurementsof the adsorption enthalpy of complexes 2 and 3 are also examined. The strategy of introduction containing nitrogen group ligand is proved successfully for the high adsorption enthalpy of complexes 2.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Elements of the organic polymer
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