CHED 1245 |
| New coordination complexes containing copper(II) atoms bound to carboxylate ligands alone and in combination with aromatic imines are described. Reactions using sterically demanding carboxylates that might generate novel carboxylate coordination modes were investigated. The carboxylic acids used comprised two structure types: diphenyl- and cyclohexylphenylacetic acid contain an approximately conical hydrocarbon substituent while 1– and 2–naphthoxyacetic acid carry large planar naphthalene moieties. The imines employed were pyridine, 2,2'–bipyridine, and 7–azaindole. With the carboxylates alone there is a marked preference for dinuclear Cu(II) paddle-wheel structures in either discrete molecular or polymeric arrangements. Reactions involving carboxylates and imines yield more varied structures, including mononuclear, dinuclear, and tetranuclear Cu(II) species. The compounds were characterized by X–ray crystallography and infrared, Raman, electronic absorption, and EPR spectroscopy. These measurements revealed simple monodentate, dangling monodentate, and bidentate bridging carboxylate binding modes, and the results of the crystallographic and vibrational spectroscopic experiments provide useful structural correlations. |
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Undergraduate Research Poster Session: Inorganic Chemistry
2:00 PM-4:00 PM, Monday, March 26, 2007 Hyatt Regency Chicago -- Riverside Center, Poster
Division of Chemical Education |