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High-temperature spin-crossover in coordination compounds of iron(II) with tris(pyrazol-1-yl)methane |
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| Authors: | O.G. Shakirova V.A. Daletsky T.P. Griaznova V.V. Syakaev |
| Affiliation: | a A.V. Nikolaev Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, pr. Akademika Lavrent’eva 3, Novosibirsk 630090, Russia b A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Centre of the Russian Academy of Sciences, Arbuzov Str. 8, 420088 Kazan, Russia c Novosibirsk State University, Pirogov Str. 2, Novosibirsk 630090, Russia |
| Abstract: | Novel mononuclear Fe(II) complexes of tris(pyrazol-1-yl)methane [Fe{HC(pz)3}2]2+ with  and p-sulfonatothiacalix[4]arene (TCAS4−) as counterions were obtained. The compounds were characterized by magnetic susceptibility method, IR and UV-Vis spectroscopy. The structure of [Fe{HC(pz)3}2]SiF6 has been analyzed by single-crystal X-ray diffraction. The 1H NMR spectroscopy measurements of [Fe{HC(pz)3}2]2(TСAS) in aqueous solution reveal the outer sphere inclusion of [Fe{HC(pz)3}2]2+ into the cyclophanic cavity of TCAS4−. The temperature induced spin-crossover 1А1 ⇔ 5Т2, accompanied by thermochromism, has been revealed from the temperature dependence of μeff and IR spectra for both complexes. The comparative analysis of magnetochemical and spectroscopy data elucidates the effect of the cyclophanic counterion on the physico-chemical properties of Fe(II) complex. |
| Keywords: | Inclusion p-Sulfonatothiacalix[4]arene Crystal structure IR NMR |
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