Structural Isomers and Vibrational Spectrum of Tetrafluorosubstituted Zinc Phthalocyanine

Structural parameters and relative Gibbs free energies are calculated by density functional theory methods for four tetrafluoro derivatives of zinc(II) phthalocyanine with substituents in non-peripheral positions. It is established that the least symmetrical isomer exhibits the highest thermodynamic stability under standard conditions. It is shown that the experimental IR spectrum of the studied compound contains contributions from the IR spectra of the corresponding isomers; a theoretical approach for the spectrum simulation is proposed.