Abstract
We measured the 57 Fe Mössbauer spectra of three types of aniline clathrate materials with a two-dimensional layered host consisting of iron(II)tetracyanonickelate(II). The formation of the three aniline clathrate materials depends on the pH of the mother aqueous solution containing equimolar amounts of (NH 4 ) 2 Fe(SO 4 ) 2 · 6H 2 O and K 2 [Ni(CN) 4 ] · H 2 O. The spectra for the three clathrate materials indicate that all the iron atoms are in iron(II) high spin states. In the spectrum of material I obtained from the relatively high pH (8–10) solution, there exists one kind of doublet with quadrupole splitting( QS ) of 1.44mm/s. Material I is previously known as Fe(NH 3 ) 2 Ni(CN) 4 · 2C 6 H 5 NH 2 . In material III , obtained from the relatively low pH (5–6) solution, the quadrupole splitting of 2.42 mm/s is larger than that of I . The Mössbauer data i.r. and elemental analysis for III suggest that the probable composition is Fe(H 2 O) 2 Ni(CN) 4 · [ mH 2 O · nC 6 H 5 NH 2 ]. Material II obtained from the middle range of pH (6–8), has at least two kinds of iron(II) sites, I type and III type, respectively.
Published Version
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