[Zurück]

G. Gravogl, P. Montin, C. Knoll, M. Seifried, D. Müller, P. Weinberger, R. Miletich:
"Pressure-induced high-spin/low-spin transition of octahedral Fe²⁺ centres in [Fe(PX)₃](BF₄)₂ ∙ PC single crystals";
Vortrag: 43rd International Conference on Coordination Chemistry, Sendai (Japan); 30.07.2018 - 04.08.2018; in: "ICCC2018 Sendai Japan", Science Council of Japan (Hrg.); (2018), S. 35.

The spin cross over (SCO) behavior of single crystals of [Fe(PX)₃](BF₄)₂ ∙ PC (PX = 1,4-bis((1H-tetrazole-1-yl)methyl)benzene) has been investigated by in-situ techniques under hydrostatic high-pressure conditions. The experiments were performed in a diamond anvil cell (DAC) and analyzed by means of single-crystal X-ray diffraction (XRD), Raman spectroscopy and UV-VIS-NIR spectroscopy. All applied analytical methods provide evidence for a continuous spin transition occurring between ~0.4 and ~0.9 GPa. However, the SCO is most obvious in the trigonal lattice parameters as determined by high-precision XRD. While the compressional behavior of the a-axis does not show any anomalies in the corresponding pressure range, the c-axis shows an unusual negative compression behavior before and after the pressure interval which is attributed to the continuous SCO transition. The volume properties of the lattice reveal a small but significant discontinuity as expected for the SCO effect.

iron(II); spin crossover; high pressure XRD

https://publik.tuwien.ac.at/files/publik_271190.pdf