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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
| Content Provider | MDPI |
|---|---|
| Author | Melnikova, Elizaveta Aleshin, Dmitry Nikovskiy, Igor Denisov, Gleb Nelyubina, Yulia |
| Copyright Year | 2020 |
| Description | 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. |
| Starting Page | 793 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst10090793 |
| Journal | Crystals |
| Issue Number | 9 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-09-08 |
| Access Restriction | Open |
| Subject Keyword | Crystals Inorganic Chemistry Crystallosolvates Iron(ii) Complexes Molecular Design Paramagnetic Nmr Spectroscopy Spin-crossover X-ray Diffraction |
| Content Type | Text |
| Resource Type | Article |
