The reaction of Cr(η6-CH3C6H5)2 with 1-benzoyl-6-hydroxy-6-phenyl fulvene, dbcpH, and with pentakis(methoxycarbonyl)cyclopentadiene, pcmcpH, proceeds with evolution of dihydrogen and formation of the ionic derivatives [Cr(η6-CH3C6H5)2][X] ([X]− = 1,2-dibenzoylcyclopentadienyl, [dbcp]−, pentakis(methoxycarbonyl)cyclopentadienyl, [pcmcp]−), which have been characterized by IR and EPR spectroscopies, X-ray diffraction and electrochemical techniques. The sterically demanding anions do not affect the structural and electronic properties of the Cr(η6-CH3C6H5)2+ cations in solution but strongly influence crystal packing. In fact, a rare cis-eclipsed conformation of the toluene rings is found for [Cr(η6-CH3C6H5)2][dbcp]•THF, whereas two independent complexes are observed in the unit cell of [Cr(η6-CH3C6H5)2][pcmcp], one with toluene rings in a cis-eclipsed conformation and the other in a staggered conformation (projections of methyl gr...

Synthesis and Characterization of Chromium(I) Bis(?6-toluene) Derivatives Containing Sterically Demanding Anions Anno 2006

PAMPALONI, GUIDO;
2006-01-01

Abstract

The reaction of Cr(η6-CH3C6H5)2 with 1-benzoyl-6-hydroxy-6-phenyl fulvene, dbcpH, and with pentakis(methoxycarbonyl)cyclopentadiene, pcmcpH, proceeds with evolution of dihydrogen and formation of the ionic derivatives [Cr(η6-CH3C6H5)2][X] ([X]− = 1,2-dibenzoylcyclopentadienyl, [dbcp]−, pentakis(methoxycarbonyl)cyclopentadienyl, [pcmcp]−), which have been characterized by IR and EPR spectroscopies, X-ray diffraction and electrochemical techniques. The sterically demanding anions do not affect the structural and electronic properties of the Cr(η6-CH3C6H5)2+ cations in solution but strongly influence crystal packing. In fact, a rare cis-eclipsed conformation of the toluene rings is found for [Cr(η6-CH3C6H5)2][dbcp]•THF, whereas two independent complexes are observed in the unit cell of [Cr(η6-CH3C6H5)2][pcmcp], one with toluene rings in a cis-eclipsed conformation and the other in a staggered conformation (projections of methyl gr...
2006
Calucci, L; Englert, U; Grigiotti, E; Laschi, F; Pampaloni, Guido; Pinzino, C; Volpe, M; Zanello, P.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/104255
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