Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume 2020, Issue 48, Pages 4523-4531Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.202000848
Keywords
Spin crossover; Direct synthesis; Iron; Coordination compounds; Triazoles; Structure elucidation
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Funding
- European Union's Horizon 2020 research and innovation programme [734322]
- Ministry of Education and Science of Ukraine [19BF037-01M, 19BF037-04]
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Spin-crossover complexes form one of the biggest families of switchable compounds. Here we show a new way to obtain spin-crossover materials by direct synthesis from metallic iron. Four complexes of Fe-II with 4-R-1,2,4-triazoles have been synthesized by a direct metal oxidation: [Fe(NH(2)trz)(3)]SO4, [Fe(NH(2)trz)(3)](BF4)(2) and two polymorphs of [Fe(Htrz)(2)(trz)]BF4. Surprisingly high quality of PXRD pattern of [Fe(NH(2)trz)(3)]SO4 allowed to perform Rietveld refinement and obtain reliable crystal structure of the latter. All compounds have been studied by magnetic susceptibility measurements, optical reflectivity, differential scanning calorimetry and Raman spectroscopy. Importantly, spin-crossover characteristics of the complexes obtained by this unusual method are preserved, thus revealing a new effective approach of direct synthesis towards switchable coordination compounds.
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