Discrete FeII spin-crossover complexes of 2,2′-dipyridylamino-substituted s-triazine ligands with phenoxo, cyanophenoxo and dibenzylamino functionalities

Hayley S Scott, Tamsyn Maree Ross, Wasinee Phonsri, Boujemaa Moubaraki, Guillaume Chastanet, Jean-Francois Letard, Stuart Robert Batten, Keith Spencer Murray

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Four 2,2′-dipyridylamino-s-triazine-substituted ligands, each of which incorporate different aromatic substituents (phenoxo, 4-CN-phenoxo and benzylamino) with different degrees of bulk and flexibility, have been formed and incorporated into a number of mononuclear FeII complexes of type trans-[FeII(L)2(NCX)2]·solvent (in which X = S, Se and BH3). These ligands were designed to promote π-π stacking between complexes. The complexes reported have been comprehensively characterised using single-crystal diffraction techniques in combination with magnetic susceptibility measurements. Light-induced excited spin-state trapping (LIESST) measurements have been performed on selected complexes. Light irradiation has shown the occurrence of a reversible photoswitching process at low temperature. New mononuclear spin-crossover compounds of type trans-[FeII(NCX)2(L)2]·solvent have been synthesised and structurally characterised. The L ligands are chelated to Fe by dipyridylamine groups and have aromatic substituents on the central triazine ring that influence cooperativity effects monitored by magnetic and light-induced excited-state spin trapping (LIESST) measurements.

Original languageEnglish
Pages (from-to)763-777
Number of pages15
JournalEuropean Journal of Inorganic Chemistry
Issue number5
Publication statusPublished - 2015


  • Cooperative phenomena
  • Iron
  • Magnetic properties
  • Spin crossover
  • Structure elucidation

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