title: Synthesis, structure and valence-trapping vs. detrapping for new trinuclear iron pentafluoro benzoate complexes: possible recognition of organic molecules by ⁵⁷Fe Mössbauer spectroscopy.
abstract: New mixed-valence trinuclear iron pentafluorobenzoate complexes were synthesized. Their valence-detrapping and/or valence-trapping phenomena were studied by (57)Fe Mössbauer spectroscopy and X-ray crystallography. For [Fe3O(C6F5CO2)6(py)3]·CH2Cl2 (1), a valence-trapped state was observed at low temperatures, while the valence-detrapped state was observed at room temperature. Removal of CH2Cl2 from 1 gives the de-solvated [Fe3O(C6F5CO2)6(py)3] (2) where the valence was trapped at room temperature. The CH2Cl2-free 2 can reversibly absorb and desorb CH3CN; the process was followed by (57)Fe Mössbauer spectroscopy by monitoring valence-trapping and valence-detrapping phenomena. Organic molecules such as benzene, toluene, ethylbenzene, cumene, and xylene are also trapped by 2 and affect the iron valence states. However, small molecules such as H2O and CO2 do not affect the valence-trapped state of 2. Three xylene isomers trapped within the nano-void of 2 were distinguished by (57)Fe Mössbauer spectroscopy at room temperature.
authors.affiliation: Department of Chemistry, Daido University, Takiharu-cho, Minami-ku, Nagoya, 457-8530, Japan. yocsakai@daido-it.ac.jp.
authors.forename: Satoru
authors.initials: S
authors.lastname: Onaka
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Sakai
authors.forename: Tomoji
authors.initials: T
authors.lastname: Ozeki
authors.forename: Tadahiro
authors.initials: T
authors.lastname: Nakamoto
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Masashi
authors.initials: M
authors.lastname: Takahashi
authors.forename: Ryo
authors.initials: R
authors.lastname: Ogiso
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Takayama
authors.forename: Michito
authors.initials: M
authors.lastname: Shiotsuka