Add time:07/29/2019         Source:sciencedirect.com

The precursors MH2(CO)(PPh3)3 (M = Ru or Os), Ru(CO)3(PPh3)2/OsH2(CO)2(PPh3)2 and IrH(CO)(PPh3)3 react with 1,3,4-thiadiazole-2,5-dithiol (tddtH2) in boilig toluene to afford the 1,3,4-thiadiazole-2,5-dithiolato (tddtH) complexes M(tddtH)2(CO)(PPh3)2, M(tddtH)2(CO)2(PPh3)2 and IrH(tddtH)2(CO)(PPh3)2 respectively. The molecular structure of the ruthenium complex Ru(tddtH)2(CO)(PPh3)2 has been determined by X-ray diffraction methods, the crystals are triclinic space group P1, Z = 2, unit cell dimensions are a = 13.051(3), b = 16.404(7), c = 16.500(5) Å, α = 119.60(2), β = 91.46(2), γ = 104.21(3)°, (V = 2932.0(16) Å3. The structure contains octahedral ruthenium(II) with mon-dentate (S-coordinated) and bi-dentate (N,S-coordinated) tddtH ligands, a carbonyl group and a trans pair of triphenylphosphine ligands. The complexes M(tddtH)2(CO)(PPh3)2 and the closely related ruthenium 5-methyl-1,3,4-thiadiazole 2-thiolato complex Ru(mtdt)2(CO)(PPh3)2 have been shown by 1H NMR to display dynamic interchange of mono- and bi-dentate thiolate ligands.Some rhodium(I), palladium(0) and platinum(0) complexes of tddtH2 are tentatively reformulated.

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