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How was the structure of Fe3(CO)12 was determined from an infrared spectrum in reaction of Fe3(CO)12...

How was the structure of Fe3(CO)12 was determined from an infrared spectrum in reaction of Fe3(CO)12 with triphenylphosphine.

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Answer #1

The reaction of the two goes as under-

Fe3(CO)12    + P(Ph)3 -------------- Fe(CO)4PPh3 + Fe(CO)3(PPh3)2

The structure of the ractant and the product are as under with their IR data-

a) Fe3(CO)12 Peak 1- Weak Absorption due to terminal CO region at 1997cm-1 and

Peak 2 - Due to Bridging CO region around 1830cm-1.

b) Fe(CO)4PPh3No peak seen due to Bridging ligand and the same was absent in the case of Fe(CO)3(PPh3)2.

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