Kristian Handoyo Sugiyarto, Djulia Onggo, Hiroki Akutsu, Varimalla Raghavendra Reddy, Hari Sutrisno, Yasuhiro Nakazawa, Ashis Bhattacharjee
Single crystal X-ray diffraction, magnetic and57Fe Mössbauer spectroscopic studies of a new iron(ii)-based spin transition complex - [Fe(3-bpp)2](CF3COO)2(bpp = 2,6-bis(pyrazol-3-yl)pyridine) are reported. The complex exhibits an incomplete thermal high spin (HS) ⇋ low spin (LS) transition at ∼226 K which is not associated with any crystallographic transition. Only one of the two crystallographic iron(ii) sites undergoes the spin transition, while the other HS site remains invariant of temperature down to 10 K. The origin of the incomplete spin transition is understood by analysing the nature of crystal packing below and above the transition temperature with special attention to the degree of distortion. The present study shows the role of the degree of distortion associated with the cations in the [Fe(3-bpp)2]2+spin transition complexes. © The Royal Society of Chemistry 2021.
Department of Chemistry Education, Yogyakarta State University, Indonesia; Inorganic and Physical Chemistry Research Division, Institut Teknologi, Bandung, Indonesia; Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan; IUC DAE CSR, Indore Campus, Indore, India; Department of Physics, Visva-Bharati University, Santiniketan, India
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