Abstract
The agreement between calculated and measured lanthanide induced shifts for the 2:1 pyridine (py), 4-picoline (4-pic) and 3,5-lutidine (3,5-lut) adducts of Eu(thd) 3 at both ambient and low temperatures using the full two-term dipolar shift equation has been examined as a function of LnN distance. It is found that the agreement factor is of limited sensitivity as a function of the LnN distance. These results question the validity of LnS distances determined exclusively using the single term McConnell-Robertson equation for calculating LIS.
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