The structure and vibrations of neutral porphine metal complexes (Me-P, Me = Co, Ni, Cu) and their d-anionic forms with an additional electron localized in vacant \( d_x^2 -_y^2 - \) and \( d_z^2 \)-orbitals are compared based on calculations by a DFT method. It is shown that such electron population causes a significant increase of the electronic charge on the macrocycle rather than on the Me atom and is accompanied by a considerable redistribution of π- and σ-electron densities (ρπ ρσ). A predominant gain of ρπ (0.49e) is found for the monoanion of Co-P (Co-P–, \( d_z^2 \)-monoanion); of ρσ (0.6e), for Ni-P–( \( d_x^2 -_y^2 - \)monoanion). These features are reflected in both the structure of the anions and the behavior of their vibrational frequencies. The greatest frequency shifts among IR active modes when populating the \( d_z^2 \)- and \( d_x^2 -_y^2 - \)orbitals occur for out-of-plane vibrations (>30 cm–1) and in-plane modes (34–46 cm–1) involving MeN- and CαCm-bonds, respectively. Abnormally large frequency lowering is found for B1g-type modes (active in the resonance Raman spectrum) involving mainly CαCm-, CβCβ-, CαCβ-, and MeN-bonds. This is related to a change in the dπ-eg interaction strength during such vibrations that contributes to a decrease in the corresponding force constants.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 77, No. 1, pp. 34–44, January–February, 2010.
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Ivashin, N.V. Calculation of the structure and vibrational states for anionic forms of Co-, Ni-, and Cu-porphines. J Appl Spectrosc 77, 28–37 (2010). https://doi.org/10.1007/s10812-010-9289-5
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DOI: https://doi.org/10.1007/s10812-010-9289-5