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Pr 6 C 2 ‐Doppeltetraeder in Pr 6 C 2 Cl 10 und Pr 6 C 2 Cl 5 Br 5
Author(s) -
Schaloske Manuel C.,
Mattausch Hansjürgen,
Kienle Lorenz,
Simon Arndt
Publication year - 2008
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800026
Subject(s) - halogen , crystallography , chemistry , crystal structure , stoichiometry , bond length , stereochemistry , materials science , alkyl , organic chemistry
Pr 6 C 2 ‐Bitetrahedra in Pr 6 C 2 Cl 10 and Pr 6 C 2 Cl 5 Br 5 The compounds Pr 6 C 2 Cl 10 and Pr 6 C 2 Cl 5 Br 5 are prepared by heating stoichiometric mixtures of Pr, PrCl 3 , PrBr 3 and C in sealed Ta capsules at 810 − 820 °C. They form bulky transparent yellow to green and moisture sensitive crystals which have different structures: space groups C 2/ c , ( a = 13.687(3) Å, b = 8.638(2) Å, c = 15.690(3) Å, β = 97.67(3)° for Pr 6 C 2 Cl 10 and a = 13.689(1) Å, b = 10.383(1) Å, c = 14.089(1) Å, β = 106.49(1)° for Pr 6 C 2 Cl 5 Br 5 ). Both crystal structures contain C ‐centered Pr 6 C 2 bitetrahedra, linked via halogen atoms above edges and corners in different ways. The site selective occupation of the halogen positions in Pr 6 C 2 Cl 5 Br 5 is refined in a split model and analysed with the bond length‐bond strength formalism. The compound is further characterized via TEM investigations and magnetic measurements ( μ eff = 3.66 μ B ).