Iron(II) Spin Crossover Systems with Multidentate Ligands

Abstract

This chapter focuses on the synthesis and characterization of iron(II) spin crossover compounds in which one of the ligands is multidentate. Here we have chosen to deal only with multidentate ligands having more than three donor atoms. The ligands are either linear or branched chelates or macrocycles. The present chapter only covers mononuclear systems (multidentate ligands which bridge two or more metal ions are discussed in the chapter by Murray and Kepert). The chapter is organized according to the nature of the ligands (N,P,S donor atoms), the denticity and the topology. The following aspects are covered for each type: synthesis, x-ray structure, magnetism and spectroscopy. The nature of the spin crossover in the solid phase or in solution is discussed in the cases where thermodynamic data are available.