Premium
Si 6 , Si 14 , and Si 22 Rings in Iodide Silicides of Rare Earth Metals
Author(s) -
Mattausch Hansjürgen,
Simon Arndt
Publication year - 1998
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19980302)37:4<499::aid-anie499>3.0.co;2-j
Subject(s) - halide , rare earth , iodide , crystallography , trigonal crystal system , materials science , carbide , chemistry , inorganic chemistry , crystal structure , metallurgy
A new class of compounds containing layers of Si nZintl polyanions is represented by the silicides MISi (M=La, Ce, Pr), La 4 I 3 Si 4 , and La 5 I 3 Si 5 (a section of the structure is shown below). Their structures contain Si 6 and the previously unknown Si 14 and Si 22 rings, which are condensed into layers. The Si atoms are coordinated in a trigonal‐prismatic fashion by M atoms to give M‐(SiSi)‐M slabs that are bonded to one another through I atoms. An extensive chemistry of halide silicides similar to that of the carbide halides of the rare earth metals can be expected.