15N - NMR Chemical Shifts of Major Chemical Families
Thomas J. Bruno, Paris D. Svoronos
The following table contains 15N NMR chemical shifts of various organic nitrogen compounds. Chemical shifts are expressed relative to different standards (NH3, NH4Cl, CH3NO2, NH4NO3, HNO3, etc.) and are interconvertible. Chemical shifts are sensitive to hydrogen bonding and are solvent dependent as seen in the case of pyridine (see note b below). Consequently, the reference as well as the solvent should always accompany chemical shift data. All shifts are relative to ammonia unless otherwise specified [1-16]. A section of "miscellaneous" data gives the chemical shift of special compounds relative to unusual standards. In reference 16, the reader can find additional details, correlation charts, and spin-spin coupling ranges.
CRC Handbook of Chemistry and Physics - 93rd edition