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Comparative preparations of homoleptic hydridic anions of iron and ruthenium using solution-based organometal
Donald E Linn1, Gabriel M Skidd, Stacci N Mc Vay
1Department of Chemistry, 2101 Coliseum Boulevard East, Indiana University-Purdue University Fort Wayne, Fort Wayne, IN 46805-1499, USA. linn@ipfw.edu
Abstract:
A study of the preparations of the complex hydridic anions [MH(6)](4)(-) (M = Fe and Ru) reveals a number of distinctive features. Here a soluble homoleptic ruthenium hydride has been prepared for the first time. For example, both FeX(2) and [Ru(eta(4)-1,5-COD)X(2)], X = Cl and Br, react with PhMgBr solutions under hydrogen to produce the title compounds. The benzene liberated in these reactions is more readily hydrogenated in the case of a homogeneous room temperature ruthenium hydride preparation to both cyclohexane and cyclohexene. The (1)H NMR spectroscopic data show that the two complex anions have hydride absorptions in the low-frequency region, delta -20.3 and -14.7, respectively. Further, (1)H spin-lattice relaxation times (T(1)) for M-H are longer in the case of Ru vs Fe.