Abstract
The natural abundance 17O NMR shielding values observed by FTNMR in the present study on a representative variety of terminal transition metal carbonyl complexes are shown to range 400–300 ppm downfield from 17OH 2. The carbonyl 17O chemical shift trends are generally opposite to those for the carbonyl 13C chemical shifts and this is explained by metal π-backbonding to the carbonyl π ★ orbitals. A metal triad effect is observed for 17O chemical shifts. There is an upfield shift in the carbonyl oxygen shielding values on descending a given group in the periodic table. This is the same effect as observed previously for the 13C shieldings of carbonyl groups.
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