Fine and hyperfine interactions with multi-level spin relaxation of the purified Giese-salt in veterinary medicine: Prussian blue compound ammonium-ferric-hexacyano-ferrate

Abstract Ammonium ferric hexacyanoferrate is a veterinary-medical milestone and antidote against radiocesium, well-known as Giese-salt after the Chernobyl disaster fed to domestic and wild animals, which shows even a rich interplay of properties in nanostructural chemistry and ferromagnetism. Among the broad analytical techniques, the ambivalence of macroscopic micrometer-sized agglomerates and nanoparticle sizes, a suggested enlarged $$\text {Fe}^{\textrm{II}}{-}\text {C}\equiv \text {N}{-}\text {Fe}^{\textrm{III}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mtext>Fe</mml:mtext> <mml:mtext>II</mml:mtext> </mml:msup> <mml:mo>-</mml:mo> <mml:mtext>C</mml:mtext> <mml:mo>≡</mml:mo> <mml:mtext>N</mml:mtext> <mml:mo>-</mml:mo> <mml:msup> <mml:mtext>Fe</mml:mtext> <mml:mtext>III</mml:mtext> </mml:msup> </mml:mrow> </mml:math> bond length by Fe K-edge XAFS results and multi-level spin relaxation in $$^{57}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mn>57</mml:mn> </mml:mmultiscripts> </mml:math> Fe Mössbauer spectroscopy are highlighted. This sets this underestimated compound in a new light, e.g., for modern biomedicine and biofunctionality, extending its essential importance in addition to hypothetical future nuclear incidents.