Synthesis, characterization and bromination of bis(phosphinoferrocenyl) gold(I) compounds |
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Authors: | Tebogo V Segapelo James Darkwa |
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Institution: | a Department of Chemistry, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Johannesburg 2006, South Africa b Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, United States |
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Abstract: | Reaction of (dppf)Au2Br2] (3) {dppf = 1,1′-bis(diphenylphosphino)ferrocene} and (dippf)Au2Br2] (4) {dippf = 1,1′-bis(diisopropylphosphino)ferrocene} with excess bromine yields two new complexes (C5H4Br3)(PR2)AuBr] (R = Ph, 5; R = i-Pr, 6). Bromination of the free diphosphinoferrocene ligands produces the expected brominated cyclopentenes (C5H4Br3)(PR2) (R = Ph, 7; R = i-Pr, 8) in good yields; however, these compounds could not be complexed to gold due to reduced basicity of 7 and 8. When the bromination is performed under wet aerobic conditions the oxidized pseudo-centrosymmetric product, doppf]FeBr4] (9) {doppf = 1,1′-bis(oxodiphenylphosphino)ferrocene, is formed as the major product. Solid-state structures of 1, 2, 4, 6, and 9 have been established by means of single-crystal X-ray crystallography. |
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Keywords: | Diphenylphosphinoferrocene Diisopropylphosphinoferrocene Bromination Phosphinocyclopentene Ligands Gold(I) complexes |
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