In:
Zeitschrift für anorganische und allgemeine Chemie, Wiley, Vol. 634, No. 12-13 ( 2008-10), p. 2246-2254
Abstract:
Pr 10 (C 2 ) 2 Br 16 : A New Structure with Discrete Octahedra Doubles The compound Pr 10 (C 2 ) 2 Br 16 is prepared from Pr, PrBr 3 , and C with a molar ratio of 7:8:6 at 780 to 820 °C as the major phase, forming polygonal black crystals with a metallic lustre which are moisture and air sensitive. It crystallizes in the triclinic system, $P{\bar 1}$ , with lattice parameters a = 9.096(2) Å, b = 12.185(2) Å, c = 16.688(3) Å, α = 79.57(3)°, β = 89.86(3)°, γ = 84.38(3)°. In the crystal structure the Pr atoms form Pr 6 octahedra centered by C 2 groups, and two such octahedra are condensed via edges to form Pr 10 units. The bromine atoms coordinate the doubleoctahedra above all free edges and connect them via $Br^{i-i}_{\rm 4/2} Br^{i-a}_{\rm 8/2} Br^{a-i}_{\rm 8/2}$ bridges. The mean C‐C distance in the C 2 unit is 1.42(2) Å. HRTEM micrographs display the characteristic fragment of the Pr 10 double octahedron. Furthermore antiphase domains are identified as specific defects in the structure.
Type of Medium:
Online Resource
ISSN:
0044-2313
,
1521-3749
DOI:
10.1002/zaac.v634:12/13
DOI:
10.1002/zaac.200800204
Language:
English
Publisher:
Wiley
Publication Date:
2008
detail.hit.zdb_id:
201094-X
detail.hit.zdb_id:
1481139-X
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