Synthesis, Structure, and Photophysical Properties of Novel Ruthenium(II) Carboxypyridine Type Complexes

Thomas Norrby, Anna Börje, Björn Åkermark, Leif Hammarström, Jan Alsins, Kianosh Lashgari, Rolf Norrestam, Jerker Mårtensson, Gunnar Stenhagen

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Abstract

A series of Ru(II) compounds and salts have been synthesized: [Ru(6-carboxylato-bpy)2] (5), [Ru(6-carboxylato-bpy)(tpy)]PF6 (9), [Ru(tpy)2](PF6)2 (8), and [Ru(bpy)2(Pic)]PF6 (11), where 6-carboxy-bpy (1) = 6-carboxy-2,2′-bipyridine, tpy (2) = 2,2′:6′,2″-terpyridine, and Pic = 2-carboxylatopyridine. The compounds have been characterized by NMR, electrospray mass spectrometry (ESI-MS), cyclic voltammetry, absorption and emission spectroscopy (at 100, 140, and 298 K), and single-crystal X-ray diffraction (complex 5). Complex 5 crystallizes in the monoclinic system, space group P21/n, formula RuC22H14N4O4·C 2H5OH, with a = 11.088(3) Å, b = 11.226-(3) Å, c = 35.283(9) Å, β= 91.41(2)°, and Z = 8. A linear dependence on the number of coordinated carboxylato groups and the electrochemical redox potentials was found, ca. 0.4 V lower reduction potential for the oxidation step (Ru(II/III)) per carboxylate group. Also, to the best of our knowledge, these are the first examples (9, 11) of mononuclear Ru(II) complexes containing a carboxypyridine-ruthenium moiety displaying any luminescence emission.

Original languageEnglish
Pages (from-to)5850-5858
Number of pages9
JournalInorganic Chemistry
Volume36
Issue number25
DOIs
Publication statusPublished - Jan 1 1997

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Cite this

Norrby, T., Börje, A., Åkermark, B., Hammarström, L., Alsins, J., Lashgari, K., Norrestam, R., Mårtensson, J., & Stenhagen, G. (1997). Synthesis, Structure, and Photophysical Properties of Novel Ruthenium(II) Carboxypyridine Type Complexes. Inorganic Chemistry, 36(25), 5850-5858. https://doi.org/10.1021/ic9705812