Marc Klingshirn (University of Illinois – Springfield, USA), Justin Bentley (District 186, Southeast High School, USA), Emush Densamo, Ngoc Pham, Jennifer Vogel (University of Illinois – Springfield, USA)
Two experiments that focus on coordination chemistry are discussed. The first is designed for the high school or first-year chemistry curriculum which utilizes hydrogen peroxide to oxidize iron(II) to iron(III) and its coordination to ligands such as thiocyanate, salicylate, and citrate. Students determine the identity of “unknown” solutions based on observations made from “known” reaction of the ligands with the metal centers. A competitive complexation demonstration can also be developed to gauge ligand strength and affinity. The second experiment geared toward advanced chemistry courses involves the coordination chemistry of unipositive iodine. Here greener iodine-pyridine analogs are synthesized by utilizing ligand and solvent variation. This ligand and solvent screening process and resulting products will be discussed.