Open Access Thesis
Bipyridinium compounds--Properties; Bipyridinium compounds--Structure; Organocobalt compounds--Properties; Organocobalt compounds--Structure; Absorption; Adsorption;
Metal-organic frameworks consist of metal ions connected by organic ligands. When the metal ions and organic ligands link together in the right geometry, polymeric and infinite 1D chains or 2D and 3D networks are formed. Porous metal-organic frameworks were synthesized from the organic ligand 4,4′-bipyridine (bpy) and cobalt(II) nitrate. The metal-organic frameworks synthesized in this study grew into both a previously known 2D bilayer structure, [Co2(bpy)3(NO3)4]n, and a new, orange 1D chain structure, [Co(bpy)NO3)2(H2O)2]n, within ethanol. It was found that the presence of water was the main factor of causing formation of the orange 1D chain crystals. Drying the orange 1D chain crystals in an oven removed the solvent from the pores and the aqua ligands, but the sample retained its crystallinity and the 1D chain structure. Both the red bilayer and purple 1D chain crystals lost their single crystallinity when resolvated with water vapor. However, when the bilayer was dried and re-exposed to ethanol vapor, it returned to its original, as synthesized structure. Sorption studies were conducted on the red bilayer crystals using gas chromatograph measurements. It was found that the pores were selective to the solvents n-hexane and ethanol, primarily due to liquid guest molecule size.
Year of Submission
Master of Science
Department of Chemistry and Biochemistry
1 PDF file (x, 63 pages)
©2013 Kathryn Mauger-Sonnek
Mauger-Sonnek, Kathryn, "Liquid sorption properties and structural changes of metal-organic frameworks of cobalt nitrate and 4,4'-bipyridine" (2013). Dissertations and Theses @ UNI. 71.