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G3 and density functional theory investigations of the structures and energies of SF(n)Cl (n=0-5) and their anions.

Computations of structures and total energies have been carried out for neutral and anionic SF(n)Cl (n=0-5), using the composite G3 method and density functional theory (DFT) at the B3LYP6-311+G(3df) level. The total energies and zero-point energies have been used here to derive electron affinities, bond dissociation energies, and heats of formation. In addition, vibrational frequencies, polarizabilities, and dipole moments are reported. Results are compared with earlier work for SF(m) (m=1-6) and demonstrate how the relatively weak S-Cl bond and reduced symmetry influence the properties of these molecules and anions. Comparisons are also made between G3 and DFT results for SF(n)Cl. Of particular interest is the alternating pattern of agreement between calculated electron affinity values with n. These calculations also provide critical energetic data needed to understand experimental measurements of electron attachment to SF(5)Cl [Van Doren et al., J. Chem. Phys. 128, 094309 (2008)] for which numerous ion products have been reported in the literature at low electron energy.