Synthesis and characterization of a new family of unsaturated triangular rhenium cluster anions of formula [Re3(µ-H)4(CO)9L]–(L = neutral two-electron donor ligand). X-Ray crystal and molecular structures of the tetraethylammonium salts of the anions with L = triphenylphosphine and pyridine

摘要: The unsaturated triangular cluster anion [Re3(µ-H)4(CO)10]– can undergo selective substitution of one the axial carbonyl ligands Re(CO)4 vertex by neutral two-electron donor L, giving [Re3(µ-H)4(CO)9L]– derivatives. anions with L = NCMe, PPh3, and pyridine (py) have been synthesized either thermal activation or, more effectively, elimination using Me3NO·2H2O. X-Ray single-crystal analyses PPh3 py derivatives, as [NEt4]+ salts, performed. Both species crystallize in monoclinic system, space group P21/n, a= 11.448(2), b= 25.311(6), c= 13.596(3)A, β= 94.00(2)°, Z= 4 for derivative, 11.087(1), 15.951(2), 17.598(4)A, 104.84(2)°, derivative. geometries two are similar to that parent anion, or ligand co-ordinated an position respect Re3 triangle, which presents a short Re–Re bond (close 2.80 A) doubly bridged hydrides. McCN derivative is most reactive member this new family, containing active centres: labile nitrile moiety. Its reaction methanol, leading [Re3(µ-H)3(CO)9(µ3-OMe)]–, exemplifies possibility paths involving both sites molecule.