Caesium bis(5-bromosalicylaldehyde thiosemicarbazonato-κ3O,N,S)ferrate(III): supramolecular arrangement of low-spin FeIII complex anions mediated by Cs+ cations.
The synthesis and crystal structure determination (at 293 K) of the title complex, Cs[Fe(C(8)H(6)BrN(3)OS)(2)], are reported. The compound is composed of two dianionic O,N,S-tridentate 5-bromosalicylaldehyde thiosemicarbazonate(2-) ligands coordinated to an Fe(III) 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 R4(4)(18) rings, which link the Fe(III) units in the a and b directions. The Fe(III) cation is in the low-spin state at 293 K.
['Powell|Robyn Elizabeth|RE|', 'Schwalbe|Carl H|CH|', 'Tizzard|Graham J|GJ|', 'Koningsbruggen|Petra J van|PJ|']
crystal structure FeIII coordination compound caesium salt low-spin state FeIII salicylaldehyde thiosemicarbazone spin-crossover behaviour