M. Armbruster et al., PREPARATION, CHARACTERIZATION, AND CRYSTA L-STRUCTURES OF TETRAIODOFERRATES(III), Zeitschrift fur anorganische und allgemeine Chemie, 622(5), 1996, pp. 795-800
Citations number
13
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
Zeitschrift fur anorganische und allgemeine Chemie
The extremely air and moisture sensitive tetraiodoferrates MFeI(4) wit
h M = K, Rb and Cs have been synthesized by reaction of Fe, MI and I-2
at 300 degrees C in closed quartz ampoules. The essentially more stab
le alkylammonium tetraiodoferrates NR(4)FeI(4) with R = H, C2H5, n-C3H
7, n-C4H9 and n-C5H11 can be obtained by reaction of Fe, NR(4)I and I-
2 in nitromethane. The Raman and UV/Vis-spectra of the black compounds
show the existence of tetrahedral [FeI4](-) ions in the structures. T
he crystal structure of the monoclinic CsFeI4 (CsTlI4 type, spgr P2(1)
/c; a = 7.281(1) Angstrom; b = 17.960(3) Angstrom; c = 8.248(2) Angstr
om; beta = 107.35(15)degrees) is built up by tetrahedral [FeI4](-) ion
s and CsI11 polyhedra. The crystal structure of the orthorhombic (n-C5
H11)(4)NFeI4 (spgr Pnna; a = 20.143(4) Angstrom; b = 12.683(3) Angstro
m; c = 12.577(3) Angstrom) contains tetrahedral [(n-C5H11)(4)N](+) ion
s and [FeI4](-) ions, respectively.