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Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study

1
A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova Str. 28, 119991 Moscow, Russia
2
Kurnakov Institute of General and Inorganic Chemistry, Leninsky prosp. 31, 119991 Moscow, Russia
3
Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia
4
Lomonosov Moscow State University, Leninskiye Gory, 1, 119991 Moscow, Russia
*
Authors to whom correspondence should be addressed.
Magnetochemistry 2018, 4(4), 46; https://doi.org/10.3390/magnetochemistry4040046
Received: 14 September 2018 / Revised: 28 September 2018 / Accepted: 10 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Controlling Molecular Nanomagnets)
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Abstract

Here we report a series of 1-phenyl-5-substituted 2,6-di(pyrazol-3-yl)pyridine complexes with iron(II) ion found in a high spin state in solids (according to magnetochemistry) and in solution (according to NMR spectroscopy), providing experimental evidence for it being an intramolecular effect induced by the phenyl groups. According to X-ray diffraction, the high spin locking of the metal ion is a result of its highly distorted coordination environment (with a very low ‘twist’ angle atypical of 2,6-di(pyrazol-3-yl)pyridine complexes), which remains this way in complexes with different substituents and counterions, in a diamagnetic zinc(II) analogue and in their solutions. Three possible reasons behind it, including additional coordination with the phenyl group, energy penalty incurred by its rotation or intramolecular stacking interactions, are addressed experimentally. View Full-Text
Keywords: high-spin complexes; iron(II) complexes; molecular design; spin-crossover; spin state trapping; paramagnetic NMR spectroscopy high-spin complexes; iron(II) complexes; molecular design; spin-crossover; spin state trapping; paramagnetic NMR spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Nelyubina, Y.; Polezhaev, A.; Pavlov, A.; Aleshin, D.; Savkina, S.; Efimov, N.; Aliev, T.; Novikov, V. Intramolecular Spin State Locking in Iron(II) 2,6-Di(pyrazol-3-yl)pyridine Complexes by Phenyl Groups: An Experimental Study. Magnetochemistry 2018, 4, 46.

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