The IR spectrum of [Ni2(5-Cp)2(CO)2] has a pair of CO stretching bands at 1857 c

Question

The IR spectrum of [Ni2(5-Cp)2(CO)2] has a pair of CO stretching bands at 1857 cm–1 (strong) and 1897 cm–1 (weak). Does this complex contain bridging or terminal CO ligands, or both? (Substitution of 5-C5H5 ligands for CO ligands leads to small shifts in the CO stretching frequencies for a terminal CO ligand.)
With drawing and details please The IR spectrum of [Ni2(5-Cp)2(CO)2] has a pair of CO stretching bands at 1857 cm–1 (strong) and 1897 cm–1 (weak). Does this complex contain bridging or terminal CO ligands, or both? (Substitution of 5-C5H5 ligands for CO ligands leads to small shifts in the CO stretching frequencies for a terminal CO ligand.)
With drawing and details please
With drawing and details please

Explanation / Answer

The complex [Ni2(5-Cp)2(CO)2] contain bridging CO ligands.

The structure is as follows

[Ni2(5-Cp)2(CO)2] + 2CO ligands <=> Ni(CO)4 + 2 5-Cp

Now in this As 5-Cp ligand is replaced by CO ligand which is a strong field ligand and shows a pi bond acceptor property. Hence Ni-C bonding interaction will increase and terminal C-O interaction will decease so the I.R stretching frequency will shift to a smaller value and so wavelength will shift ot a higher value.

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