AI Article Synopsis
- A new iron(III) coordination compound was created using a specific hydrazino Schiff-base ligand, allowing for a two-step spin transition over a wide temperature range of 45 K.
- The crystal structure analysis revealed two slightly different iron(III) centers in octahedral coordination, influenced by the ligand design and hydrogen bonding interactions.
- Extensive characterization techniques, including magnetic susceptibility, EPR spectroscopy, and more, confirmed the distinct transition behaviors and provided insights into the high-spin state of the iron(III) species.
Article Abstract
A new iron(III) coordination compound exhibiting a two-step spin-transition behavior with a remarkably wide [HS-LS] plateau of about 45 K has been synthesized from a hydrazino Schiff-base ligand with an N,N,O donor set, namely 2-methoxy-6-(pyridine-2-ylhydrazonomethyl)phenol (Hmph). The single-crystal X-ray structure of the coordination compound {[Fe(mph)(2)](ClO(4))(MeOH)(0.5)(H(2)O)(0.5)}(2) (1) determined at 150 K reveals the presence of two slightly different iron(III) centers in pseudo-octahedral environments generated by two deprotonated tridentate mph ligands. The presence of hydrogen bonding interactions, instigated by the well-designed ligand, may justify the occurrence of the abrupt transitions. 1 has been characterized by temperature-dependent magnetic susceptibility measurements, EPR spectroscopy, differential scanning calorimetry, and (57)Fe Mossbauer spectroscopy, which all confirm the occurrence of a two-step transition. In addition, the iron(III) species in the high-spin state has been trapped and characterized by rapid cooling EPR studies.
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| http://dx.doi.org/10.1021/ic801973x | DOI Listing |
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