In:
Zeitschrift für anorganische und allgemeine Chemie, Wiley, Vol. 636, No. 1 ( 2010-01), p. 188-195
Abstract:
The compounds RE 19 (C 2 ) 3 I 34 ( RE = Y, Gd) were prepared from RE , RE I 3 and carbon in a molar ratio of 20:34:18 by the addition of three parts of RE N at 920 °C (Y) and 900 °C (Gd), respectively, forming moisture sensitive, black shiny brittle polyhedra. X‐ray single crystal investigations indicated the triclinic system and E value statistics showed P $\bar{1}$ , a = 9.3683(9) Å, b = 10.3410(9) Å, c = 22.1726(20) Å, α = 79.104(10)°, β = 88.175(11)°, γ = 69.227(10)° for Y 19 (C 2 ) 3 I 34 and a = 9.4172(9) Å, b = 10.3390(10) Å, c = 22.3711(24) Å, α = 79.001(12)°, β = 88.320(12)°, γ = 69.250(11)° for Gd 19 (C 2 ) 3 I 34 , respectively. The RE atoms form two sets of different RE 6 octahedra centered by C 2 groups, which are coordinated by iodine atoms above all edges. In addition one isolated RE position occurs. The refinement served problems because of significant disorder showing up in a 65 % occupation of the isolated RE position and quite significant residual electron densities near the heavy atom positions. Electron diffraction confirmed the ideal structure, however, a detailed analysis via HRTEM showed alternations in the sequence of two kinds of layers.
Type of Medium:
Online Resource
ISSN:
0044-2313
,
1521-3749
DOI:
10.1002/zaac.200900483
Language:
English
Publisher:
Wiley
Publication Date:
2010
detail.hit.zdb_id:
201094-X
detail.hit.zdb_id:
1481139-X
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