NEW PHOSPHANIDO-BRIDGED AND PHOSPHINIDENE -BRIDGED CLUSTER COMPLEXES OF MERCURY - THE CRYSTAL-STRUCTURES OF THE MULTINUCLEAR COMPLEXES [HG-3(FE(CO)(4))(2)X-2] (X=CL, BR) (1, 2), [HG-10(FE(CO)(4))(4)((PBU)-BU-T)(4)CL-4] (3), [HG-14(FE(CO)(4))(5)((PBU)-BU-T)(8)CL-2] (4), FE(CO)(4))(7)((PBU)-BU-T)(4)((PBUSIME3)-BU-T)BR-2] (5), [HG-5(FE(CO)(4))(3)((PBU2)-BU-T)(2)BR-2] (6), [HG-8(FE(CO)(4))(4)(P2PH2)(2)((PPR3)-PR-N)CL-4](7), [HG-8(FE(CO)(4))(4)(P2PH2)(2)(PPH2ET)CL-4]

The reaction of [Fe(CO)(4)(HgX)(2)] (X = Cl, Br). with (BuP)-Bu-t(SiMe 3)(2) leads to the two multinuclear complexes [Hg-3{Fe(CO)(4)}(2)X-2] (X = Cl, Br) (1, 2) as well as to the phosphinidene-bridged mercury cl usters [Hg-10{Fe(CO)(4)}(4) ((PBu)-Bu-t)(4)Cl-4] (3) and [Hg-14{Fe(CO) (4)}(5)((PBu)-Bu-t)(8)Cl-2] (4) In the presence of tertiary phosphines another phosphinidene-bridged cluster Hg-12{Fe(CO)(4)}(7)((PBu)-Bu-t) (4)(PtBuSiMe3)Br-2] . [(SiMe3OPPr3)-Pr-i] (5) and, when using (Bu2P)-B u-t(SiMe3), the phosphanido-bridged cluster [Hg-5{Fe(CO)(4)}(3)((PBu2) -Bu-t)(2)Br-2] (6) result. The reaction of [Fe(CO)(4)(HgX)(2)] (X = Cl , Br) with PhP(SiMe3)(2) in the presence of tertiary phosphines yields to the phosphanido-bridged mercury clusters [Hg-8{Fe(CO)(4)}(4)(P2Ph2 )(2)((PPr3)-Pr-n)Cl-4] (7), [Hg-8{Fe(CO)(4)}(4)(P2Ph2)(2)(PPh2Et)Cl-4] (8), and [Hg-10 {Fe(CO)(4)}(6)(P2Ph2)(2)((PPr3)-Pr-n)Br-4] (9). The s tructures of 1-9 were characterized by X-ray single crystal structure analysis.