3. Spin-Crossover in Discrete Polynuclear Complexes

  1. Juan Olguín1 and
  2. Sally Brooker2

Published Online: 18 JAN 2013

DOI: 10.1002/9781118519301.ch3

Spin-Crossover Materials: Properties and Applications

Spin-Crossover Materials: Properties and Applications

How to Cite

Olguín, J. and Brooker, S. (2013) Spin-Crossover in Discrete Polynuclear Complexes, in Spin-Crossover Materials: Properties and Applications (ed M. A. HALCROW), John Wiley & Sons Ltd, Oxford, UK. doi: 10.1002/9781118519301.ch3

Editor Information

  1. School of Chemistry, University of Leeds, UK

Author Information

  1. 1

    Department of Chemistry, University of Otago, New Zealand

  2. 2

    Department of Chemistry and The MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, New Zealand

Publication History

  1. Published Online: 18 JAN 2013
  2. Published Print: 15 FEB 2013

ISBN Information

Print ISBN: 9781119998679

Online ISBN: 9781118519301



  • cobalt(II) complexes;
  • dinuclear chromium(II) complexes;
  • dinuclear iron(II) complexes;
  • discrete polynuclear complexes;
  • higher nuclearity iron(II) compounds;
  • iron(III) complexes;
  • spin-crossover (SCO)


This chapter reviews recent advances in the development of discrete polynuclear spin-crossover (SCO) complexes of d4-d7 metal ions published from 2004–2011 inclusive. Synthesis of discrete polynuclear complexes is achieved by one of two approaches. The first, controlled/designer-ligand, approach involves use of polydentate ligands with desired number of metal ion binding pockets. The second, supramolecular, approach involves the use of a combination of simpler blocking/capping and bridging ligands that are either easily accessed or commercially available. Whilst a large number of new discrete polynuclear SCO complexes of iron have been reported, including dinuclear iron(II) complexes, higher nuclearity iron(II) compounds, and iron(III) complexes, no new examples featuring cobalt(II) or cobalt(III) complexes and chromium(II) complexes have been reported. The chapter presents a discussion on these new SCO-active iron(II) and iron(III) complexes, and describes the new studies on the existing SCO-active cobalt(II) and chromium(II) complexes.