Iron(II) and Cobalt(II) Complexes with 2,6-Bis(1,4-Diphenyl-5-Hydroxy-1H-Pyrazol-3-yl)pyridine: Synthesis, Structures, and Spin States

Никовский, И. А.; Polezhaev, Alexander V.; Aleshin, Dmitry Yu.; Melnikova, Elizaveta K.; Dorovatovskii, Pavel V.; Nelyubina, Yulia V.

doi:10.1134/s1070328420050048

Cited by 2 publications

(1 citation statement)

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“…Solvents were purchased from commercial sources and purified by distilling from conventional drying agents under an argon atmosphere prior to use. 2,2’:6′,2″-Terpyridine ( tpy ) was obtained commercially, while the ligands L were synthesized as reported earlier; ,, the homoleptic complex [Fe( L1 ) 2 ](BF 4 ) 2 with the spin state previously probed only in a solid state was obtained by a modified procedure from Fe(BF 4 ) 2 ·6H 2 O and L1 . The synthesis of the complexes [Fe( L 2 ) 2 ](BF 4 ) 2 and [Fe( L 3 ) 2 ](BF 4 ) 2 was reported elsewhere. , …”

Section: Methodsmentioning

confidence: 99%

Selective Pathway toward Heteroleptic Spin-Crossover Iron(II) Complexes with Pyridine-Based N-Donor Ligands

et al. 2022

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A new synthetic pathway is devised to selectively produce previously elusive heteroleptic iron(II) complexes of terpyridine and N,N′-disubstituted bis(pyrazol-3-yl)pyridines that stabilize the opposite spin states of the metal ion. Such a combination of the ligands in a series of the heteroleptic complexes induces the spin-crossover (SCO) not experienced by the homoleptic complexes of these ligands or shifts it to lower/higher temperatures respective to the SCO-active homoleptic complex. The midpoint temperatures of the resulting SCO span from ca. 200 K to the ambient temperature and beyond the highest temperature accessible by NMR spectroscopy and SQUID magnetometry. The proposed “one-pot” approach is applicable to other N-donor ligands to selectively produce heteroleptic complexesincluding those inaccessible by alternative synthetic pathwayswith highly tunable SCO behaviors for practical applications in sensing, switching, and multifunctional devices.

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