Fourteen-electron ring model and the anomalous magnetic circular dichroism of meso-triarylsubporphyrins

Steven Vancoillie, Marc Hendrickx, Minh Tho Nguyen, Kristine Pierloot, Arnout Ceulemans, John MacK, Nagao Kobayashi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The MCD spectra of meso-triarylsubporphyrins show a sign anomaly which is correlated with the acceptor properties of the aryl substituent. From the spectra, magnetic moments of the excited states are determined. In the context of a simplified orbital model, the sign change is attributed to the quenching of the magnetic moment of the LUMO by acceptor orbitals of the substituent. The actual calculation of this moment presents a major challenge to computational methods. It is shown that wave function techniques based on CASSCF underestimate the covalency effects that are responsible for the quenching. In contrast, a CI method based on DFT orbitals yields excellent results, which fully support the orbital model.

Original languageEnglish
Pages (from-to)3960-3967
Number of pages8
JournalJournal of Physical Chemistry A
Volume116
Issue number15
DOIs
Publication statusPublished - 2012 Apr 19

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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