Azaphenalene phthalocyanines: Phthalocyanine analogues with sixMembered-ring units instead of five-membered-ring units

Soji Shimizu, Hua Zhu, Nagao Kobayashi

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Mixed-condensation reaction of 1,8-naphthalenedicarbonitrile and a 4,5-disubstituted phthalonitrile provided a series of phthalocyanine (Pc) analogues with azaphenalene (AP) moieties in place of the isoindole moieties. Monosubstituted species, APPc, and the two structural isomers of disubstituted species, adj-AP2Pc and oppAP2Pc, were successfully isolated by gel-permeation chromatography on HPLC apparatus. Their structures were elucidated by 1H NMR spectroscopy and X-ray crystallographic analysis. Replacement of the isoindole moieties with azaphenalene moieties created six-membered-ring units in the core and caused distortion of the molecular structures. The Q-band absorption shifted to the red upon an increase in the number of azaphenalene units; the shape of the absorption spectra depended on the molecular symmetries. APPc and opp-AP2Pc showed a large splitting of the Q band, whereas adjAP2Pc exhibited a single broad Q band. These changes in the absorption spectra, as well as the unique electronic structures, are discussed in detail, based on magnetic circular dichroism spectra, electrochemical measurements, and density functional theory calculations.

Original languageEnglish
Pages (from-to)11151-11159
Number of pages9
JournalChemistry - A European Journal
Volume16
Issue number36
DOIs
Publication statusPublished - 2010 Sep 24

Keywords

  • Aromaticity
  • Azaphenalene
  • Conjugation
  • Phthalocyanines
  • UV/Vis spectroscopy

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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