Knowledge Bank

The microwave spectrum of morpholine has been observed within the 8-40 GHz region. The ground vibrational state rotational constants and quadrupole coupling constants for the chair equatorial conformer are (in MHz) for undeuterated morpholine $A=4924.88,B=4625.15,C=2684.25,\chi aa=2.22,\chi bb=2.51,\chi cc=-4.73$ and for N-deutero morpholine $A=4925.39,B=4399.67,C=2607.09,\chi aa=1.92,chibb=2.59,\chi c=-4.51$. The dipole moment of this conformer has been determined to be 1.71 D.