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Structural Principles of the Coordination Number Eight: WF 2− 8 , ReF 2− 8 , and XeF 2− 8
Author(s) -
Adam Steffi,
Ellern Arkady,
Seppelt Konrad
Publication year - 1996
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.19960020408
Subject(s) - ion , chemistry , coordination number , ideal (ethics) , electron , electronic structure , crystallography , bond length , crystal structure , inorganic chemistry , stereochemistry , computational chemistry , atomic physics , physics , organic chemistry , quantum mechanics , philosophy , epistemology
WF 6 , ReF n ( n = 6 and 7), and XeF 6 combined with NOF to give (NO + 2 ) WF 2− 8 , (NO + ) 2 ReF 2− 8 , and (NO + ) 2 XeF 2– 8 , respectively. Also NO 2 F reacted with ReF 6 to form (No 2 + )ReF 2– 8 . Cs 2 XeF 8 ·4BrF 5 crystallized from a solution of Cs 2 XeF 8 in BrF 5 . These five compounds were subjected to X‐ray structure determinations. The structure of [NO(NOF) 2 ] + IF – 8 was used as a standard for comparison. All anions exhibit square‐antiprismatic geometry, independent of their electronic configurations. Bond lenghts in ReF 2– 8 and XeF 2– 8 are larger than in WF 2– 8 and IF – 8 , owing to the presence of nonbonding electrons. Deviations from the ideal structure in XeF 2– 8 are attributed to cation‐anion interactions.