Abstract
Using the DFT/B3LYP method with the base set 6‐31G**, we carried out calculation of the frequencies of the normal vibrations of porphin and of its five isotopic types. Scaling of force constants for out‐of‐plane vibrations has been performed in independent natural coordinates. The symmetry coordinates are introduced and a force field for out‐of plane vibrations of a porphin molecule in independent coordinates of symmetry is obtained. A new correlation of the frequencies of vibrations in the type of the symmetry B 1u for the isotopic type of the ‐d 2 porphin molecule is suggested on the basis of discrete analysis of the distribution of a potential energy.
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Berezin, K.V., Tatarenko, O.D. & Nechaev, V.V. Calculation of Out‐of‐Plane Vibrations of a Porphin Molecule. Journal of Applied Spectroscopy 69, 534–539 (2002). https://doi.org/10.1023/A:1020695813891
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DOI: https://doi.org/10.1023/A:1020695813891