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New Spin-Crossover Compounds Containing the [Ni(mnt)] Anion (mnt = Maleonitriledithiolate)
- Source :
- Magnetochemistry; Volume 7; Issue 5; Pages: 72, Magnetochemistry, Vol 7, Iss 72, p 72 (2021)
- Publication Year :
- 2021
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2021.
-
Abstract
- Two novel salts containing the anion [Ni(mnt)2]− (mnt = maleonitriledithiolate) have been synthesized. The counter-ions, [Fe(II)(L1 or L2)2], are cationic complexes where L1 and L2 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)(L1)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)(L2)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.
- Subjects :
- Pyrazine
Chemistry
Cationic polymerization
spin-crossover
molecular magnets
magnetic materials
molecular materials
Electronic, Optical and Magnetic Materials
Ion
Magnetization
chemistry.chemical_compound
Crystallography
Chemistry (miscellaneous)
Spin crossover
Mössbauer spectroscopy
Pyridine
Materials Chemistry
QD1-999
Single crystal
Subjects
Details
- Language :
- English
- ISSN :
- 23127481
- Database :
- OpenAIRE
- Journal :
- Magnetochemistry; Volume 7; Issue 5; Pages: 72
- Accession number :
- edsair.doi.dedup.....e5fabdaa4c92dd189235aa7ad73febc4
- Full Text :
- https://doi.org/10.3390/magnetochemistry7050072