Three new complexes of the [Re6(μ3-Se) 8]2+ core-containing clusters with the water-soluble trialkylphosphine ligand 1,3,5-triaza-7-phosphaadamantane (PTA), [Re 6(μ3-Se)8(PEt3) 5(PTA)](SbF6)2 (P5PTA, 1), [Re 6(μ3-Se)8(PEt3) 5(PTAH)][Re6(μ3-Se)8(PEt 3)5(PTA)](SbF6)5 (2), and [Re 6(μ3-Se)8(PEt3) 5(PTAH)]2(HBr)(SbF6)2Br4 (3) have been prepared and structurally characterized. Unexpected protonation of the cluster-bound PTA ligand was observed when coordination of 1 with HgI 2 was attempted, affording compound 2 featuring a protonated PTA ligand, PTAH. Deliberate acidification of 1 with HBr produced compound 3, and the protonation was investigated by using 31P NMR spectroscopy. Crystallographic studies revealed distinct structural distortions of the ligand as a result of protonation.
ASJC Scopus subject areas
- Inorganic Chemistry