Topic: Synthesis, Crystal-Chemistry, and Reactivity of Bimetallic Fluoroacetates: From Serendipity to a New Family of Organic–Inorganic Hybrids
Speaker: Professor Federico Rabuffetti - Wayne State University
Host: Professor Remi Beaulac
Date: Monday, January 28, 2019
Time: 11:20 AM
Location: 136 CEM
Extended inorganic hybrids incorporating multiple metals bridged by organic halogenated ligands have the potential to afford tunable pathways for energy-transfer and charge-transport, like those required in optical energy conversion applications. These hybrids exhibit infinite bonding connectivity of the metals in at least one dimension, facilitating metal-to-metal energy-transfer and long-range charge-transport. In the past, extended inorganic hybrids have been synthesized using geometrically flexible halogenated ligands such as diketonates to bridge two metals.
Comparatively little progress has been made in exploring this chemical space using rigid halogenated ligands such as monocarboxylates. A comprehensive search of the Cambridge Structural Database shows that the library of extended inorganic hybrids in which rigid halogenated ligands bridge multiple metals remains limited to two dozen solids. In this talk I will summarize research efforts aimed at expanding this chemical space using fluorinated acetates as ligands to bridge alkali, alkaline-earth, divalent 3d, and trivalent 4f metals. The crystal growth and crystal-chemistry of bimetallic fluoroacetates will be explained in detail. Emphasis will be placed on highlighting the ability of the fluoroacetato ligand to satisfy the electronic and geometric requirements of two distinct metals, thus providing access to a chemically and structurally diverse family of hybrid crystals. Finally, I will describe the luminescence and reactivity of bimetallic fluoroacetates and show that these hybrids serve as thermosensitive light emitters and self-fluorinating single-source precursors to mixed-metal fluorides.