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Anomalous Spin Transition Observed in Bis(2,6‐bis(pyrazol‐3‐yl)pyridine)iron( II ) Thiocyanate Dihydrate
Author(s) -
Bhattacharjee A.,
Ksenofontov V.,
Sugiyarto K.H.,
Goodwin H.A.,
Gütlich P.
Publication year - 2003
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200304356
Subject(s) - thiocyanate , differential scanning calorimetry , materials science , pyridine , phase transition , thermal hysteresis , magnetism , hysteresis , singlet state , phase (matter) , crystallography , spin transition , chemistry , condensed matter physics , inorganic chemistry , thermodynamics , organic chemistry , physics , excited state , atomic physics
Abstract Bis(2,6‐bis(pyrazol‐3‐yl)pyridine)iron( II ) thiocyanate dihydrate undergoes a two‐step singlet ( 1 A 1 ) ⇄ quintet ( 5 T 2 ) transition in which both steps are associated with thermal hysteresis. Thermal cycling of the sample results in its conversion to a second phase which displays a single‐step transition with a very narrow hysteresis loop. This second phase slowly reverts to the initial phase on standing at 300 K. The interconversions are completely reversible. The spin state changes have been monitored by measurement of magnetism and Mössbauer spectra and by differential scanning calorimetry (DSC) studies.