DETERMINATION OF THE DIPOLE MOMENT OF $H_{3}N-SO_{3}$
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Date
1997
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Ohio State University
Abstract
The dipole moment of $H_{3}N-SO_{3}$ has been determined using pulsed nozzle Fourier transform microwave spectroscopy. The value obtained, 6.204(12) D, is in reasonable agreement with published ab initio $estimate^{h}$. These measurements follow our previously $reported^{i}$ structural work on this complex in which the intermolecular N-S bond was shown to be significantly longer in the gas phase than in the solid state. Presumably, the mechanism for the contraction of the N-S bond upon crystallization involves a sharply rising dipole moment function at shorter distances. Thus, the present result is especially interesting in connection with the observed gas-solid structure changes. The complex has also been postulated as a potential seed molecule for the nucleation of atmospheric aerosols, and we comment on possible implications of its phase-dependent structure and bonding on the kinetics, and thermodynamics of the nucleation process.
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$^{h}$M. W. WONG, K B Wiberg, and M. J. Frisch, J. Am Chem. Soc. 114, 523(1992). $^{i}$M. Canagaratna, J. A. Phillips, H. Goodfriend, and K. R. Leopold, J. Am. Chem. Soc., 118, 5290 (1996).
Author Institution: Department of Chemistry, University of Minnesota
Author Institution: Department of Chemistry, University of Minnesota