Structure and characterization of a mixed valent iron molybdophosphate: (NH3CH2CH2NH3)(8)(H3O)(1.3)(Fe0.3Fe0.7Mo12O32)-Fe-II-Mo-III(HPO4)(2) (H2PO4)(6)(OH)(6)center dot 8.7H(2)O

摘要

A new iron molybdophosphate, (NH3CH2CH2NH3)(8)(H3O)(1.3)(Fe0.3Fe0.7Mo12O32)-Fe-II-Mo-III-(HPO4)(2)(H2PO 4)(6)(OH)(6).8.7H(2)O (1) has been synthesized under hydrothermal conditions and structurally characterized by single crystal X-ray diffractions. It crystallizes in the monoclinic, space group P2(1), a = 15.845(7) Angstrom, b = 15.867(7) Angstrom, c = 17.132(8) Angstrom, beta = 92.794(5)degrees, Z = 2. The crystal structure of 1 contains the isolated polyanion units [FeMo12O32(HPO4)(2)(H2PO4)(6)(OH)(6)] around which the portonated ethylenediamine ions, lattice water and the protonated water molecules are positioned. By hydrogen bond interactions the polyanions are interconnected to form a novel three-dimensional iron molybdophosphate. The Mossbauer spectra quantitatively ascertain the assignment and distribution of iron oxidation states, and reveal the properties of the magnetic structure. Other characterization by IR and thermal analysis are also described. (C) 2003 Elsevier B.V. All rights reserved. [References: 18]