Question: A schematic catalytic cycle is shown below, based on rhodium phosphine complexes, with the ligand donor atoms denoted by P (= phosphine), and X

A schematic catalytic cycle is shown below, based on rhodium phosphine complexes,

A schematic catalytic cycle is shown below, based on rhodium phosphine complexes, with the ligand donor atoms denoted by P (= phosphine), and X and Y as other ligands. The local point symmetry at Rh is also given. The cycle is monitored by solution phase Raman spectroscopy. Rh P X-Rh 1 C2v Cs X-Rh -Rh 4 D3h 3 C, (a) USE THE METHOD OF UNSHIFTED BONDS to deduce the symmetries of Rh-P stretching modes in compounds 1 to 4. (14 marks) (b) Determine which compounds 1 to 4 can be identified uniquely from the form of their Raman spectra. 2.

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