Caesium bis­(5-bromo­salicyl­aldehyde thio­semicarbazonato-κ3O,N,S)ferrate(III): supramolecular arrangement of low-spin FeIII complex anions mediated by Cs+ cations

Robyn Elizabeth Powell, Carl H. Schwalbe, Graham J. Tizzard, Petra J. van Koningsbruggen

Research output: Contribution to journalArticlepeer-review


The synthesis and crystal structure determination (at 293 K) of the title complex, Cs[Fe(C8H6BrN3OS)2], are reported. The compound is composed of two dianionic O,N,S-tridentate 5-bromo­salicyl­aldehyde thio­semicarbazonate(2-) ligands coord­inated to an FeIII cation, displaying a distorted octa­hedral geometry. The ligands are orientated in two perpendicular planes, with the O- and S-donor atoms in cis positions and the N-donor atoms in trans positions. The complex displays inter­molecular N-H...O and N-H...Br hydrogen bonds, creating R44(18) rings, which link the FeIII units in the a and b directions. The FeIII cation is in the low-spin state at 293 K.
Original languageEnglish
Pages (from-to)169-174
Number of pages6
JournalActa Crystallographica Section C: Structural Chemistry
Issue number3
Early online date6 Feb 2015
Publication statusPublished - Mar 2015

Bibliographical note

Acta Crystallographica Section C.

Funding: EPSRC

Supplementary data avaialbe on the journal website.


  • spin-crossover behaviour
  • low-spin state Fe(III)
  • crystal structure
  • caesium salt
  • salicyl­aldehyde thio­semicarbazone
  • Fe(III) coordination compound


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