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A Reversible Hydrogen‐Bond Isomerization Triggered by an Abrupt Spin Crossover near Room Temperature
Author(s) -
JornetMollá Verónica,
GiménezSaiz Carlos,
Yufit Dmitry S.,
Howard Judith A. K.,
Romero Francisco M.
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202003654
Subject(s) - isomerization , spin crossover , hydrogen bond , thermomagnetic convection , chemistry , spin states , oxide , pyridine , photochemistry , supramolecular chemistry , crystallography , materials science , inorganic chemistry , molecule , catalysis , medicinal chemistry , crystal structure , organic chemistry , physics , quantum mechanics , magnetic field
The spin crossover salt [Fe(bpp) 2 ](isonicNO) 2 ⋅ 2.4 H 2 O ( 1 ⋅2.4 H 2 O) (bpp=2,6‐bis(pyrazol‐3‐yl)pyridine; isonicNO=isonicotinate N ‐oxide anion) exhibits a very abrupt spin crossover at T 1 /2 =274.4 K. This triggers a supramolecular linkage (H‐bond) isomerization that responds reversibly towards light irradiation or temperature change. Isotopic effects in the thermomagnetic behavior reveal the importance of hydrogen bonds in defining the magnetic state. Further, the title compound can be reversibly dehydrated to afford 1 , a material that also exhibits spin crossover coupled to H‐bond isomerization, leading to strong kinetic effects in the thermomagnetic properties.