The Journal of Chemical Physics
234308 (8 pages)
The rotational spectra of H3N⋯AgI and H2O⋯AgI have been recorded between 6.5 and 18.5 GHz by chirped-pulse Fourier-transform microwave spectroscopy. The complexes were generated through laser vaporisation of a solid target of silver or silver iodide in the presence of an argon gas pulse containing a low concentration of the Lewis base. The gaseous sample subsequently undergoes supersonic expansion which results in cooling of rotational and vibrational motions such that weakly bound complexes can form within the expanding gas jet. Spectroscopic parameters have been determined for eight isotopologues of H3N⋯AgI and six isotopologues of H2O⋯AgI. Rotational constants, B0; centrifugal distortion constants, DJ, DJK or ΔJ, ΔJK; and the nuclear quadrupole coupling constants, χaa(I) and χbb(I) - χcc(I) are reported. H3N⋯AgI is shown to adopt a geometry that has C3v symmetry. The geometry of H2O⋯AgI is Cs at equilibrium but with a low barrier to inversion such that the vibrational wavefunction for the v = 0 state has C2v symmetry. Trends in the nuclear quadrupole coupling constant of the iodine nucleus, χaa(I), of L⋯AgI complexes are examined, where L is varied across the series (L = Ar, H3N, H2O, H2S, H3P, or CO). The results of experiments are reported alongside those of ab initio calculations at the CCSD(T)(F12*)/AVXZ level (X = T, Q).
Original Publication Citation
Medcraft, C., Gougoula, E., Bittner, D. M., Mullaney, J. C., Blanco, S., Tew, D. P., . . . Legon, A. C. (2017). Molecular geometries and other properties of H2O⋯AgI and H3N⋯AgI as characterised by rotational spectroscopy and ab initio calculations. The Journal of Chemical Physics, 147(23) 234308. doi:http://dx.doi.org/10.1063/1.5008744
Medcraft, Chris; Gougoula, Eva; Bittner, Dror M.; Mullaney, John C.; Blanco, Susana; Tew, David P.; Walker, Nicholas R.; and Legon, Anthony C., "Molecular Geometries and Other Properties of H2O⋯AgI and H3N⋯AgI as Characterised by Rotational Spectroscopy and ab initio Calculations" (2017). Chemistry & Biochemistry Faculty Publications. 98.
Available for download on Thursday, December 20, 2018