The topology of metal-organic frameworks (MOFs) is determined by several factors including the coordination geometry of the metal ion, the number of bridging ligands connected to each metal ion, the number of metal centers connected to each ligand, and the solvent used to grow the crystals. It is important to learn how these factors affect the MOF structure during the crystal growing process. We have used resonance Raman spectroscopy and UV-visible spectroscopy to study the interaction between Co2+ ions and 4,4'-bipyridine bridging ligands in solution as crystals of Co2+/4,4'-bipyridine frameworks grow. We have also used the flexible coordination sphere of Co2+ and Ni2+ and the incorporation of non-bridging aqua ligands to generate new polymeric 1D chain structures with 4,4'-bipyridine. X-ray diffraction and thermogravimetric analysis show that the 1D chain crystals of the Co2+ material retain their structure even when some of the aqua ligands are removed.

Synthetic control and guest binding in porous metal-organic frameworks

247th National Meeting (2014)

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