The NQPI Seminar Series presents Ahmed Aboelenen on “Scorpionate-supported Transition Metal Borohydride Complexes” on Thursday, Sept. 26, at 4:10 p.m. in Walter Hall 245.
Aboelenen is a graduate student in Chemistry & Biochemistry at Ohio University.
Abstract: Borohydride complexes are of interest as hydrogen storage materials, as reduction and dehalogenation reagents, and as precursors for hydride complexes. We are utilizing the so-called scorpionate ligands devised by Trofimenko, TpR,R′ =hydrotris(3-R,5-R′-pyrazol-1-yl)borate1 to stabilize late 3d divalent transition metal complexes with borohydride co-ligands, inspired by previous work of Mehn, et al.(2) and Desrochers, et al.(3) We present the syntheses, characterizations, and reactivity of [(TpR,Me)M(BH4)], where M= Fe, Co, and Ni and R = Me, Ph). These complexes exhibit a different coordination mode of the borohydride because of the different steric environment around the particular metal. The divergent borohydride coordination modes were confirmed by X-ray crystallography and FTIR Spectroscopy. These complexes react with halocarbons in an autocatalytic mechanism, and are converted to hydride complexes by decomposition in the presence of Lewis bases.(4) The latter reduce CO2 to yield formate complexes, which show different binding modes that depend on the particular transition metal.
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