A DFT study on the vibrational spectroscopy of protoporphyrin IX

Ferenc Billes, Balázs Várady

Research output: Contribution to journalArticle

6 Citations (Scopus)


Infrared and Raman spectra of protoporphyrin IX were recorded. DFT quantum chemical calculations were performed. Optimised molecular geometry, electric charge distribution, vibrational force constants were computed. The normal coordinate analysis and the scaling of the force constants yielded all the necessary data for the simulation of the infrared and Raman spectra and the potential energy distribution calculations. The result was the interpretation of all vibrational modes of the molecule. Conclusions were drawn from the difficulties arisen during the assignment of the vibrational spectra of such large molecules.

Original languageEnglish
Pages (from-to)729-734
Number of pages6
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Issue number4
Publication statusPublished - Sep 1 2008


  • Molecular geometry
  • Normal coordinate analysis
  • Protoporphyrin IX
  • Quantum chemistry
  • Spectrum simulation
  • Vibrational spectra

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

Fingerprint Dive into the research topics of 'A DFT study on the vibrational spectroscopy of protoporphyrin IX'. Together they form a unique fingerprint.

  • Cite this