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The reaction of Ph 2 SbSiMe 3  with CpFe(CO) 2 X (X = Cl, Br) leads to the formation of the diphenyldiferriostibonium salts [{CpFe(CO) 2 } 2 SbPh 2 ] 2 FeX 4 , whereas PhSb(SiMe 3 ) 2  and CpFe(CO) 2 Cl react to give the phenyltriferriostibonium salt [{CpFe(CO) 2 } 3 Sb] 2 FeCl 4 . Sb(SiMe 3 ) 3  reacts with CpFe(CO) 2 X (X = Cl, Br) to yield the halogenotriferriostibonium salts [{CpFe(CO) 2 } 3 SbX] 2 FeX 4 . The chloro derivative can also be obtained: from SbCl 3  with {CpFe(CO) 2 } 2  or Na[CpFe(CO) 2 ], and from SbCl 5  and Na[CpFe(CO) 2 ], The compounds have been characterized by spectroscopic (IR, NMR, MS), analytical (C, H) and X-ray diffraction investigations ([{CpFe(CO) 2 } 2 SbPh 2 ] 2 FeBr 4 , [{CpFe(CO) 2 } 3 SbPh] 2 FeCl 4 , [{CpFe(CO) 2 } 3 SbCl] 2 FeCl 4 ).

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Synthesis and Structure of Di- and Triferriostibonium Salts of the Type [Fp 2 SbPh 2 ] 2 FeX 4  and [Fp 3 SbR] 2 FeX 4  (Fp = CpFe(CO) 2 , R = Ph, Cl; X = Cl, Br, I)