SYNTHESES OF THE MO-AG-SE COMPLEXES WITH A CUBANE-LIKE CORE (MOAG(3)SE(3)X) (X=CL AND BR) - CRYSTAL-STRUCTURES OF (MOAG3-SE3CL)(PPH(3))(3)SE AND H(3))(3)SE-CENTER-DOT-0.5PH(3)PSE-CENTER-DOT-3MECN

Novel Mo-AE-Se complexes with a cubane-like core, namely {MoAg(3)Se(3) X}, {MoAg3Se3Cl} (PPh(3))(3)Se (1) and {MoAg3Se3Br} (PPh(3))(3)Se (2), have been synthesized from [Et(4)N](2)MoSe4 and [Ag(PPh(3))(3)X] (X = Cl or Br) in CH2Cl2; (1) . 0.5Ph(3)PSe . 3MeCN (3) and (2) . 0.5Ph(3) PSe . 3MeCN (4) have been isolated by reaction of Na2Se2 and (1) or (2 ) in MeCN-CH2Cl2, respectively. The structures of (1) and (4) have bee n determined by X-ray single crystal diffraction analyses. Both contai n a highly distorted cubane-like {MoAg(3)Se(3)X} cluster core with one Se2- terminal ligand bound to Mo, and PPh(3) ligands bound to each Ag . The average Ag-Cl and Ag-Br distances are 2.842(2) and 2.936(4) Angs trom for (1) and (4), respectively. The i.r. and P-31-n.m.r. spectra h ave also been studied.