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Article

Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy

1
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia
2
Lomonosov Moscow State University, Leninskiye Gory, 1-3, 119991 Moscow, Russia
3
Mendeleev University of Chemical Technology of Russia, Miusskaya pl., 9, 125047 Moscow, Russia
*
Author to whom correspondence should be addressed.
Crystals 2020, 10(9), 793; https://doi.org/10.3390/cryst10090793
Received: 26 August 2020 / Revised: 4 September 2020 / Accepted: 7 September 2020 / Published: 8 September 2020
(This article belongs to the Special Issue Coordination Polymers)
A series of three different solvatomorphs of a new iron(II) complex with N,N′-disubstituted 2,6-bis(pyrazol-3-yl)pyridine, including those with the same lattice solvent, has been identified by X-ray diffraction under the same crystallization conditions with the metal ion trapped in the different spin states. A thermally induced switching between them, however, occurs in a solution, as unambiguously confirmed by the Evans technique and an analysis of paramagnetic chemical shifts, both based on variable-temperature NMR spectroscopy. The observed stabilization of the high-spin state by an electron-donating substituent contributes to the controversial results for the iron(II) complexes of 2,6-bis(pyrazol-3-yl)pyridines, preventing ‘molecular’ design of their spin-crossover activity; the synthesized complex being only the fourth of the spin-crossover (SCO)-active kind with an N,N′-disubstituted ligand. View Full-Text
Keywords: crystallosolvates; iron(II) complexes; molecular design; paramagnetic NMR spectroscopy; spin-crossover; X-ray diffraction crystallosolvates; iron(II) complexes; molecular design; paramagnetic NMR spectroscopy; spin-crossover; X-ray diffraction
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MDPI and ACS Style

Melnikova, E.K.; Aleshin, D.Y.; Nikovskiy, I.A.; Denisov, G.L.; Nelyubina, Y.V. Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy. Crystals 2020, 10, 793. https://doi.org/10.3390/cryst10090793

AMA Style

Melnikova EK, Aleshin DY, Nikovskiy IA, Denisov GL, Nelyubina YV. Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy. Crystals. 2020; 10(9):793. https://doi.org/10.3390/cryst10090793

Chicago/Turabian Style

Melnikova, Elizaveta K.; Aleshin, Dmitry Y.; Nikovskiy, Igor A.; Denisov, Gleb L.; Nelyubina, Yulia V. 2020. "Spin State Behavior of A Spin-Crossover Iron(II) Complex with N,N′-Disubstituted 2,6-bis(pyrazol-3-yl)pyridine: A Combined Study by X-ray Diffraction and NMR Spectroscopy" Crystals 10, no. 9: 793. https://doi.org/10.3390/cryst10090793

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