1,10-Phenanthroline-5,6-dione complexes of middle transition elements: Mono- and dinuclear derivatives

Euan K. Brechin, Lucia Calucci, Ulli Englert, Ludovica Margheriti, Guido Pampaloni, Calogero Pinzino, Alessandro Prescimone

Research output: Contribution to journalArticlepeer-review

Abstract

The synthesis and the characterization of several mono- and dinuclear middle transition metal derivatives of 1,10-phenanthroline5,6-dione, 1, are presented. The reaction of 1 with CrCl2(THF)(2) gives CrCl2(O, O'-C12H6N2O2)(THF)(2), 2, while the halides of iron(II), cobalt(II) and nickel(II) afford adducts of general formula MX2(N, N'-C12H6N2O2), M = Fe, 4, Co, 5, X = Cl; M = Ni, 6, X = Br. DFT calculations on CrCl2(L)(THF)(2) with L = O, O'-C12H6N2O2 or O, O'-C14H8O2 allowed a direct comparison of the coordination properties of 9,10-phenanthrenequinone and 1,10-phenanthroline-5,6-dione to be made. Dinuclear compounds of general formula CrCl2(THF)(2)(O, O'-C12H6N2O2-N, N') MXnLm, M = Zr, 7, X = Cl, n = 4, m = 0; M = Cr, 8, X = Cl, n = 2, L = THF, m = 2; M = Fe, 9, Co, 10, X = Cl, n = 2, m = 0; M= Ni, 11, X = Br, n = 2, m = 0, are prepared from 2 and the corresponding metal halide, while VCp2(O, O'-C12H6N2O2-N, N') FeCl2, 12, is synthesized by reacting 4 with VCp2. The electronic properties of the different complexes are investigated by magnetic moment measurements and EPR spectroscopy. (C) 2007 Elsevier B. V. All rights reserved.

Original languageEnglish
Pages (from-to)2375-2384
Number of pages10
JournalInorganica Chimica Acta
Volume361
Issue number8
DOIs
Publication statusPublished - 2 Jun 2008

Keywords

  • chromium
  • iron
  • cobalt
  • nickel
  • 1,10-phenanthroline-5,6-dione
  • 9,10-phenanthrenequinone
  • EPR spectroscopy
  • DFT calculations
  • X-RAY
  • ORTHO-SEMIQUINONE
  • CRYSTAL-STRUCTURE
  • OXIDATION-STATES
  • METAL COMPLEXES
  • COORDINATION
  • LIGANDS
  • TETRAHYDROFURAN
  • 2,2'-BIPYRIDYL
  • CHEMISTRY

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