Author/Authors :
Shakirova، نويسنده , , O.G. and Lavrenova، نويسنده , , L.G. and Daletsky، نويسنده , , V.A. and Shusharina، نويسنده , , E.A. and Griaznova، نويسنده , , T.P. and Katsyuba، نويسنده , , S.A. and Syakaev، نويسنده , , V.V. and Skripacheva، نويسنده , , V.V. and Mustafina، نويسنده , , A.R. and Solovieva، نويسنده , , S.E.، نويسنده ,
Abstract :
Novel mononuclear Fe(II) complexes of tris(pyrazol-1-yl)methane [Fe{HC(pz)3}2]2+ with SiF 6 2 - 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 , IR , crystal structure , NMR
