Electrochemistry of homoleptic bis[3(4),12(13),21(22),30 (31)-tetra(teit-butyl)-naphthalocyaninato] rare earth(III) complexes

Renjie Li, Xianxi Zhang, Na Pan, Peihua Zhu, Nagao Kobayashi, Jianzhuang Jiang

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The electrochemistry of homoleptic bis(naphthalocyaninato) double-decker complexes for the whole series of tervalent rare earths M(TBNc)2 (M = Y, La...Lu except Ce and Pm; H2TBNc = 3(4),12(13),21(22),30(31)-tetra(tert-butyl)naphthalocyanine) has been systematically studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Up to three quasi-reversible one-electron oxidations and four quasi-reversible one-electron reductions have been revealed for these double-deckers.The half-wave potentials of all oxidations and the first reduction for double-decker complexes are dependent on the size of the metal center. The difference between the redox potentials of the first and second reductions for MIII(TBNc)2, which represents the potential difference between the first oxidation and first reduction of [M III(TBNc)2]-, lies in the range 1.09-0.95 V and gradually diminishes along with the lanthanide contraction, indicating increased π-π interaction in the double-deckers in the same order. Comparison of electrochemical characteristics between M(TBNc)2 and M(TBPc)2 (H2TBPc = 2(3),9(10),16(17),24(25)-tetra(tert-butyl)-phthalocyanine) reveals that extension of the ligand conjugated system upon going from phthalocyanine to naphthalocyanine attenuates the ring-to-ring separation effect on the redox potentials of the double-deckers of the whole series of tervalent lanthanides.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalJournal of Porphyrins and Phthalocyanines
Volume9
Issue number1
DOIs
Publication statusPublished - 2005

Keywords

  • Electrochemistry
  • Naphthalocyanines
  • Rare earths
  • Sandwich complexes

ASJC Scopus subject areas

  • Chemistry(all)

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