REACTIONS OF [RU(C6H4(NH)2-1,2)(PPH3)3] WITH GROUP-6 METAL-CARBONYLS - CRYSTAL-STRUCTURE AND REACTIVITY WITH DIPHOSPHINES OF THE LINEAR HETEROTRINUCLEAR COMPLEX [RU2MO(MU-C6H4(NH)2-1,2)2(CO)6(PPH3)2]

The compound [Ru{C6H4(NH)2-1,2)(PPh3)3] 1 reacts with the Group 6 metal carbonyls, [M(CO)6], in hot aromatic solvents giving different reaction products according to the stability of the metal carbonyl: [Ru2{mu-C6H4(NH)2-1,2}(CO)4(PPh3)2] 2 (M = Cr); [W(CO)5(PPh3)] and trans-[W(CO)4(PPh3)2] (M = W) and the dark brown [Ru2Mo{mu-C6H4(NH)2-1,2}2(CO)6(PPh3)2] 3 (M = Mo). The structure of 3 has been established from X-ray diffraction analysis. This compound reacts, in boiling toluene, with diphosphines (Ph2P)2X [X = CH2 (dppm) or C4H8 (dppb)] to form [Ru2Mo{mu-C6H4(NH)2-1,2}2(CO)4-(diphosphine)2] (diphosphine = dppm 4 or dppb 5) and for X = C2H4 (dppe) or C3H6 (dppp) a mixture of (Mo(CO)4(diphosphine)] and [Ru{C6H4(NH)2-1,2)(CO)(diphosphine)] was obtained. The new trinuclear complexes have been characterised by elemental analysis and by spectroscopic (IR and NMR) methods.