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New Spin-Crossover Compounds Containing the [Ni(mnt)] anion (mnt = Maleonitriledithiolate)
Journal article   Open access   Peer reviewed

New Spin-Crossover Compounds Containing the [Ni(mnt)] anion (mnt = Maleonitriledithiolate)

SCOTT STEVEN TURNER, Joanna Daniell, Hiroki Akutsu, Peter N. Horton, Simon J. Coles and Volker Schünemann
Magnetochemistry, Vol.7(72), 7050072
19/05/2021

Abstract

spin-crossover; molecular magnets; magnetic materials; molecular materials
Two novel salts containing the anion [Ni(mnt)2 ] − (mnt = maleonitriledithiolate) have been synthesized. The counter-ions, [Fe(II)(L 1 or L 2 )2 ], are cationic complexes where L 1 and L 2 are methylated derivatives of 2,6-bis(pyazolyl)pyridine or pyrazine, which are similar to ligands found in a series of spin-crossover (SCO) complexes. Both salts are characterized by variable temperature single crystal X-ray diffraction and bulk magnetization measurements. Compound 1, [Fe(II)(L 1 )2 ][Ni(mnt)2 ]2 displays an incomplete and gradual SCO up to 300 K, followed by a more rapid increase in the high-spin fraction between 300 and 350 K. Compound 2, [Fe(II)(L 2 )2 ][Ni(mnt)2 ]2 .MeNO2 , shows a gradual, but more complete SCO response centered at 250 K. For compound 2, the SCO is confirmed by variable temperature Mössbauer spectroscopy. In both cases, the anionic moieties are isolated from each other and so no electrical conductivity is observed.
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