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Triethanolaminate iron perchlorate revisited: change of space group, chemical composition and oxidation states in [Fe 7 (tea) 3 (tea-H) 3 ](ClO 4 ) 2 (tea-H 3 is triethanolamine).
Acta Crystallographica. Section C, Structural Chemistry 2018 Februrary 2
The X-ray crystal structure of tris[N-(2-hydroxyethyl)-2,2'-iminodiethanolato]tris(2,2',2''-nitrilotriethanolato)tetrairon(II)triiron(III) bis(perchlorate), [Fe7 (C6 H12 NO3 )3 (C6 H13 NO3 )3 ](ClO4 )2 or [Fe7 (tea)3 (tea-H)3 ](ClO4 )2 (tea-H3 is triethanolamine), is known from the literature [Liu et al. (2008). Z. Anorg. Allg. Chem. 634, 778-783] as a heptanuclear coordination cluster. The space group was given as I21 3 and is reinvestigated in the present study. We find a new space-group symmetry of Pa-3 and could detect O-H hydrogens, which were missing in the original publication. Consequences on the Fe oxidation states are investigated with the bond-valence method, resulting in a mixed-valence core of four FeII and three FeIII centres. Symmetry relationships between the two space groups and the average supergroup Ia-3 are discussed in detail.
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