Organometallic Group 11 (CuIII, AgIII, AuIII) Complexes of a trans-Doubly N-Confused Porphyrin: An “Expanded Imidazole” Structural Motif

Jiaying Yan, Yufeng Yang, Masatoshi Ishida, Shigeki Mori, Bao Zhang, Yaqing Feng, Hiroyuki Furuta

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12 Citations (Scopus)

Abstract

Complexation of group 11 metal cations with an α-bis(phenylthio)-substituted trans-doubly N-confused porphyrin (trans-N2CPSPh: 4) afforded a series of square-planar trivalent organometallic complexes (i.e., Cu-H4, Ag-H4, and Au-H4). The X-ray crystal structures of the complexes revealed highly planar core geometries along with the presence of peripheral amine and imine nitrogen sites of the pyrrolic moieties. NMR, UV/Vis absorption, and magnetic circular dichroism (MCD) spectroscopies suggested the 18 π-electron aromaticity of the complexes. The aromaticity was also fully analyzed by various theoretical methodologies such as nucleus-independent chemical shift (NICS) and anisotropic induced current density (ACID) calculations. The central metal affects the amphiprotic character of the complexes possessing both pyrrolic amino nitrogen and imino nitrogen atoms at the periphery, which was examined by the photometric titration with trifluoroacetic acid (TFA) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), respectively. The inherent acidity of the complexes was followed in the order; Cu-H4>Au-H4>Ag-H4 and that of basicity was Au-H4>Ag-H4>Cu-H4. The complexes could be considered as an “expanded imidazole” structural motif.

Original languageEnglish
Pages (from-to)11375-11384
Number of pages10
JournalChemistry - A European Journal
Volume23
Issue number47
DOIs
Publication statusPublished - Aug 22 2017

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Organic Chemistry

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