alexa Ab Initio Calculations of the Ground Electronic States of Polyiodide Anions
Microbiology

Microbiology

Journal of Antivirals & Antiretrovirals

Author(s): Shart SB

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Equilibrium bond lengths, harmonic frequencies, electron affinities, and dissociation energies (as appropriate) were determined for I, I-,I2, I2-, and I3- by CCSD(T) and four DFT methods (BLYP, BPW91, B3LYP, and B3PW91) using a basis set consisting of a relativistic effective core potential and a triple-zeta plus 2df polarization functions (ECP-TZ(2df)) for the valence electrons. Comparison of the DFT results with the CCSD(T) results and available experimental information indicates that the B3PW91 approach does particularly well describing the bonding in these species. B3PW91/ECP-TZ(2df) calculations of I5- in linear (D∞h) and bent (C2v) geometries indicate that the linear structure is a low-energy transition state lying only about 0.1−0.2 eV above the C2v global minimum-energy structure. Harmonic frequencies and infrared and Raman intensities are calculated for both structures and compared to available experimental information.

This article was published in J.Phys Chem and referenced in Journal of Antivirals & Antiretrovirals

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