posted on 2020-03-23, 11:36authored byMichael
C. Pfrunder, Jacob J. Whittaker, Simon Parsons, Boujemaa Moubaraki, Keith S. Murray, Stephen A. Moggach, Neeraj Sharma, Aaron S. Micallef, Jack K. Clegg, John C. McMurtrie
Encasing the classic
spin-crossover (SCO) complex cation [Co(terpy)2]2+ in different anionic supramolecular frameworks
modulates its SCO behavior, tuning both its T1/2 (shift of up to 200 K) and the cooperativity of the system.
The SCO behavior is influenced by the organization of the complex
cations within supramolecular anionic frameworks comprising iodoperfluorobenzenes
and iodide anions, with tighter packing of complexes leading to a
more abrupt transition. This approach for the control of magnetic
properties is applicable to any complex with suitable counterions
and hence provides significant opportunity for further developing
the properties of many such stimuli-responsive complexes, without
requiring changes to their chemical structures. The magnetic properties
of the materials presented herein are investigated through variable-temperature
magnetic susceptibility measurements and variable-temperature and
-pressure molecular structure studies.