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Lanthanide-induced shfits of (13)C nuclear magnetic resonances are reported for several amines and n-butyl isocyanide. Contact contributions to such shifts, especially of beta carbons, are clearly important for the chelates of Eu(+3) and Pr(+3). The importance of contact terms is shown to change in a rather predictable manner with the structure of the amine.

proceedings of the national academy of sciences of the united states of america

Nuclear Magnetic Resonance Shift Reagents: Abnormal <sup>13</sup> C Shifts Produced by Complexation of Lanthanide Chelates with Saturated Amines and <i>n</i> -Butyl Isocyanide

Nuclear Magnetic Resonance Shift Reagents: Abnormal 13 C Shifts Produced by Complexation of Lanthanide Chelates with Saturated Amines and n -Butyl Isocyanide

Nuclear Magnetic Resonance Shift Reagents: Abnormal ¹³ C Shifts Produced by Complexation of Lanthanide Chelates with Saturated Amines and n -Butyl Isocyanide