Scorpion-like dithiocarbamato-carboxylate ligands for linking M(CO)3+ (M = Tc, Re)

Complexation of M(CO)(3)(+) (M = Tc, Re) with dithiocarbamato-carboxylate ligands was studied. It was found that the dithiocarbamate chelation unit has rather high affinity to M(CO)(3)(+) species and the resulting complexes are extremely stable in a wide pH range. The complex M(CO)(3)[S2CN(CH2COO)(2)] is monomeric in solution (ESI MS) and dimeric in the crystal phase (single-crystal XRD). The "scorpion-like" dithiocarbamato-carboxylate ligands were prepared; it was shown that C-5 chain is long enough to reach back to the free coordination vacancy in M(CO)(3)(+) core and to block it.