Abstract
Abstract14N nuclear quadrupole resonance was observed in acetamide, CH3CONH2, and chloroacetamide, CH2ClCONH2, by pulse technique. The resonance frequencies in both compounds increase with raising from 80 K to 340 K. In acetamide the activation energy was calculated to be 17.6 kJ · mol−1 in the temperature range from 260 K to 320 K and 48.1 kJ · mol−1 above 320 K. The former is thought to be attributed to the reorientation of the amino group and the latter, to the torsional motion of molecule. In the case of chloroacetamide the echo signal is too weak to obtain the correct T1 value, but the relaxation mechanism seems to be similar to that of acetamide. The positive temperature dependence of resonance frequencies is due to the hydrogen bond.
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