摘要:
The behavior of the Ph-2(2-C5H4N)PSe ligand in the reactions with Ru-3(CO)(12) and the mononuclear complexes MCl2(PhCN)(2) (M=Pd or Pt) has been investigated. The reaction with Ru-3(CO)(12) is characterized by P=Se bond cleavage, affording the 48-electron compound [Ru-3(mu(3)-Se)(mu-PPh2)(2)(mu-C5H4N)(mu(3)-C5H4N)(CO)(6)] (1), the open triangular 50-electron nido clusters [Ru-3(mu(3)-Se),(CO)(9-n) {P(2-C5H4N)Ph-2}] (2 and 3, for n=1 and 2, respectively) and the octahedral 62-electron closo cluster [Ru-4(mu(4)-Se)(2)(CO){mu-P, N-Ph-2(2-C5H4N)P}] (4). The cluster 1 derives by the multiple fragmentation of two phosphine ligands on the metal triangle involving the P=Se and P-C bond cleavages. The molecular structure of 4 shows a short Ru...P non-bonding separation that can be viewed as a preliminary step towards the P-C bond cleavage. In the reactions with MCl2(PhCN)(2) (M=Pd, Pt) Ph-2(2-C5H4N)PSe remains intact affording mononuclear neutral complexes of the type MCl2{N,Se-Ph-2(2-C5H4N)PSe}. The crystal structure of the palladium derivative 5 has been determined by X-ray diffraction methods. (C) 2003 Elsevier Science B.V. All rights reserved.