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The relative donor effect of simple ligands can be determined by measuring the carbonyl stretching frequencies...

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Chemistry

The relative donor effect of simple ligands can be determined bymeasuring the carbonyl stretching frequencies of their metalcarbonyl coordination complexes. Imagine you have prepared a seriesof L2-Ir(CO)Cl complexes and measured the carbonyl stretches.Assign the stretches (2102, 2054, 2032, 2014, 1995 cm -1 ) to thecomplexes containing the following ligands (assume that all ligandsare purely σ-donors): NPh3, PPh3, pyridine, 4-fluoropyridine,4-bromopyridine. Explain your reasoning!

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4.4 Ratings (761 Votes)
Ligands that are trans to a carbonyl can have a largeeffect on the ability of the CO ligand to effectively backbond tothe metal The better the carbonyl backbond to the metal thelower will be the carbonyl stretching frequency as the    See Answer
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