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2005
Lanthanoids
I 2800
20- 020
LnCl(CN2) with Ln: La, Ce, and Pr: Synthesis and Structure of a New Lanthanide
Chloride Cyanamide Related to the PbFCl-Type Structure. — LaCl(CN2) is
prepared by solid state metathesis reactions between LaCl3 and Li 2(CN2) (silica tube,
600 °C, 2 d). Single crystals are obtained as colorless transparent plates using a
LiCl/KCl flux. LaCl(CN2) crystallizes in space group P21/m with Z = 2. The structure
is closely related to that of tetragonal LaOCl (PbFCl type) and contains a [La2Cl2]4+
block layer and two layers of C N22 - ions in an alternating sequence. Cerium and
praseodymium analogues were identified from indexed powder patterns with analogous unit cells, indicating that they form isostructural compounds. —
(SRINIVASAN, R.; GLASER, J.; TRAGL, S.; MEYER*, H.-J.; Z. Anorg. Allg.
Chem. 631 (2005) 2-3, 479-483; Inst. Anorg. Chem., Eberhard-Karls-Univ., D-72076
Tuebingen, Germany; Eng.) — Schramke
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