The Structure of a Mixed-Valence Iron Fluoride, Fe2F5.2H2O.

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Abstract:

The mixed valence iron compound, Fe2F5.2H2O, crystallizes in the orthorhombic system, space group Imma. The unit cell has dimensions a 7.4897A, B 10.8978, and c 6.6716A and contains four formula weights. The calculated and experimental densities are 2.96 gcc and 2.94 gcc, respectively, at 20 or - 1 degree. Measurements of diffracted intensities employed theta-2 theta scans with filtered MoK radiation on a Picker diffractometer. A total of 250 reflections in the range 2 or 2 theta 50 degrees were retained as observed. The structure was determined using the heavy-atom method and least-squares refinement. The final conventional discrepancy factor was 0.053. The non-molecular solid possesses a three dimensional network structure with distinct FeII and FeII coordination sites. The average FeII-F and FeIII-F bond lengths are 2.0606A and 1.9416A, respectively. The aquo groups are coordinated to the iron II with Fe-O bond length of 2.131A. Author

Author(s):
Hall, W. ; Kim, S. ; Zubieta, J. ; Walton, E. G. ; Brown, D. B.
Author Organization(s):
VERMONT UNIV BURLINGTON DEPT OF CHEMISTRY
Descriptive Note:
Technical rept.,
Pagination:
0026

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-4
Contract/Grant Number(s):
N00014-75-C-0756
 Subject Terms
Joint Capability Areas:
JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_6_Net Centric; JCA_1.2.3_Educating; JCA_6.1_Information Transport; JCA_5_Command and Control
Modernization Areas:
Microelectronics
Communities of Interest:
Biomedical
Descriptor(s):
*CRYSTAL STRUCTURE, *COMPLEX COMPOUNDS, *HYDRATES, *IRON COMPOUNDS, *FLUORIDES, MIXTURES, CHEMICAL BONDS, COLORS, LEAST SQUARES METHOD, VALENCE, DEHYDRATION
Field(s)/Group(s):
Organic Chemistry, Physical Chemistry
Keyword(s):
Heavy atom method, WUNR356593
Report Date:
1977 Feb 09