Temperature dependence of the 15N and 1H nuclear magnetic shielding in NH3

摘要: The temperature and density dependence of the 15N 1H nuclear resonance in 15NH3 gas have been observed. which is a measure effect intermolecular interactions on shielding linear, with slopes −0.041±0.002 ppm/amagat for nucleus −0.0032±0.0001 nucleus. limit zero pressure σ0 varies due to rovibrational motion. This special interest NH3 because previously reported exceptional 31P PH3. It found that also an case and, fact, near 300 K PH3 nearly identical values dσ0/dT(+0.00651±0.00082 ppm/deg from 320 380 K). All other cases, involving variety nuclei wide molecular types, exhibit dσ0/dT<0.