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Novel mononuclear Fe(II) complexes of tris(pyrazol-1-yl)methane [Fe{HC(pz) 3 } 2 ] 2+ with SiF62- and p-sulfonatothiacalix[4]arene (TCAS 4− ) 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 ]SiF 6 has been analyzed by single-crystal...