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Adducts of Rh2[MTPA]4 with some phosphine chalcogenides: nature of binding and ligand exchange.

Magnetic resonance in chemistry : MRC (2004-06-08)
Tamás Gáti, András Simon, Gábor Tóth, Damian Magiera, Stefan Moeller, Helmut Duddeck
ABSTRACT

Adducts of four phosphine chalcogenides with the chiral dirhodium complex ([Rh-Rh]) were investigated by variable-temperature 1H and 31P NMR spectroscopy in order to compare their properties as axial ligands. Whereas the selenide (1) and the sulfide (2) are strong ligands with electrostatic attraction and, in addition, a significant orbital (HOMO-LUMO) interaction, the phosphine oxide compounds (P=O) bind primarily via electrostatic attraction and are relatively weak donors. Moreover, the overall bond strength in these adducts depends on steric congestion around the P=O group.

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Sigma-Aldrich
3-(Methylthio)propylamine, 97%

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