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200517.fm Page 7 Friday, March 18, 2005 2:52 PM
2005
Structure
D 2000
17- 007
Ba6Pr 3I19: Linear [Pr3I16] Trimers with Two Excess Electrons in a Three-Center —
Two-Electron Bond. — Black single crystals of the title compound are grown by
reduction of PrI3 with barium metal at 780 °C. Ba6Pr3I19 crystallizes in the monoclinic
space group C2/c with Z = 4. The structure contains linear Pr3I16 trimers formed by
three square antiprisms sharing two common faces. These trimers share one empty cube
resulting in rows that are arranged in a tetragonal close-packed fashion and held
together by Ba2+ cations. — (GERLITZKI, N.; MUDRING*, A.-V.; MEYER, G.; Z.
Anorg. Allg. Chem. 631 (2005) 2-3, 381-384; Inst. Anorg. Chem., Univ. Koeln,
D-50939 Koeln, Germany; Eng.) — Schramke
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