Abstract
The rotational spectrum of the weakly bound complex (PH 3, HCN) in its vibrational ground state has been observed by the technique of pulsed-nozzle, Fourier-transform microwave spectroscopy. The isotopic species (PH 3, HC 14N), (PH 3, DC 14N) and (PH 3, HC 15N) exhibit spectra of the symmetric-top type from which accurate values of the spectroscopic constants B 0, D J , D JK and X aa ( 14N) have been determined. For (PH 3, HC 14N) the appropriate values are: B 0 = 1553.3709(1) MHz, D J = 3.306(3) kHz, D JK = 256.9(6) kHz and X aa ( 14N) = −4.3591(14) MHz. The geometry of the complex established from the spectroscopic constants is one of C 3v symmetry at equilibrium, with the HCN molecule lying along the C 3 axis of PH 3 and oriented so that it forms a hydrogen bond to the P atom. The effective distance from P to the C nucleus is r(P ⋯ C) = 3.913 Å.
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