Room-Temperature Spin Crossover in a Solution of Iron(II) Complexes with N , N '-Disubstituted Bis(pyrazol-3-yl)pyridines.

Autor:	Aleshin DY; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia., Nikovskiy I; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.; Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005 Moscow, Russia., Novikov VV; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.; Moscow Institute of Physics and Technology, Institutskiy per., 9, 141700 Dolgoprudny, Russia., Polezhaev AV; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.; Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005 Moscow, Russia., Melnikova EK; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.; Lomonosov Moscow State University, Leninskiye Gory, 1-3, 119991 Moscow, Russia., Nelyubina YV; A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova Str., 28, 119991 Moscow, Russia.; Bauman Moscow State Technical University, 2nd Baumanskaya Str., 5, 105005 Moscow, Russia.; Moscow Institute of Physics and Technology, Institutskiy per., 9, 141700 Dolgoprudny, Russia.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2021 Nov 22; Vol. 6 (48), pp. 33111-33121. Date of Electronic Publication: 2021 Nov 22 (Print Publication: 2021).
DOI:	10.1021/acsomega.1c05463
Abstrakt:	Here, we report a combined study of the effects of two chemical modifications to an N , N '-disubstituted bis(pyrazol-3-yl)pyridine (3-bpp) and of different solvents on the spin-crossover (SCO) behavior in otherwise high-spin iron(II) complexes by solution NMR spectroscopy. The observed stabilization of the low-spin state by electron-withdrawing substituents in the two positions of the ligand that induce opposite electronic effects in SCO-active iron(II) complexes of isomeric bis(pyrazol-1-yl)pyridines (1-bpp) was previously hidden by NH functionalities in 3-bpp precluding the molecular design of SCO compounds with this family of ligands. With the recent SCO-assisting substituent design, the uncovered trends converged toward the first iron(II) complex of N , N '-disubstituted 3-bpp to undergo an almost complete SCO centered at room temperature in a less polar solvent of a high hydrogen-bond acceptor ability. Competing Interests: The authors declare no competing financial interest. (© 2021 The Authors. Published by American Chemical Society.)
Databáze:	MEDLINE
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