Synthesis and characterization of binuclear transition metal-rhenium(VII) complexes with bridging cyanide ligands

Isabel S. Gonçalves, Fritz E. Kühn, André D. Lopes, A. Jorge Parola, Fernando Pina, João Sotomayor, Carlos C. Romão

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Reacting transition metal complexes in low oxidation states, containing one or two cyanide ligands, with methyltrioxorhenium(VII) leads to bridged mixed metal compounds in good yields. The Re(VII) core is then surrounded by five or six ligands, respectively. The strength of these CN bridges and thus the stability of the newly generated bimetallic compound strongly depends on the donor strength of the ligands surrounding of the Cr/Mo/W or Fe moiety. The stability of the mixed metal molecules is reflected in the temperature dependent behavior of their 17O-NMR spectra, in their IR (Re=O) stretching frequencies and force constants, as well as several other spectroscopic data. UV-vis absorption spectra show the appearance of charge transfer bands. In the case of the mixed Mo/Re complexes the 95Mo-NMR spectroscopy is also a helpful tool to examine the donor capability of the Mo moiety. The described compounds also show photosensitivity.

Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalJournal Of Organometallic Chemistry
Volume560
Issue number1-2
DOIs
Publication statusPublished - 15 Jun 1998

Keywords

  • Cyanide bridges
  • Fe/Re binuclear complexes
  • Mo/Re binuclear complexes
  • Re(VII) oxides

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