CLUSTERDITHIOPHOSPHINATES WITH CUBANE-TYPE MO2-M2S4-CORE (M = CO, W)

The syntheses of tetranuclear complexes Mo2W2S4L6 3 and Mo2Co2S4L2(CO) 2(CH3CN)2 4 (L = R2PS2-; a: R = Et, b: R = Pr) containing the cubane-t ype Mo2M2S4 core are reported. While in 4 both Mo atoms are chelated b y L, the dithiophosphinato group acts as a chelating and bridging liga nd in 3. It is shown that there exist four isomers of 3 which differ n ot only in the function of L but also in the kind of metals which are chelated and bridged. Magnetic and NMR spectroscopic data are given. T he structure of a mixed crystal of the two beta-isomers of 3a containi ng three bridging and three chelating ligands L is reported: orthorhom bic space group Pbca Z = 8 and lattice parameters a = 2186.6(7), b = 2 264.0(7), and c = 2386.7(6) pm.