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New Ternary Iodides of Lanthanum and Cerium, A II MI 4 (A = Sr, Ba, Nd, Sm, Eu; M = La, Ce)
Author(s) -
Gerlitzki Niels,
Hammerich Stefanie,
Meyer Gerd
Publication year - 2004
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.200400172
Subject(s) - lanthanum , ternary operation , cerium , monoclinic crystal system , tantalum , crystallography , materials science , lanthanide , analytical chemistry (journal) , chemistry , nuclear chemistry , inorganic chemistry , crystal structure , metallurgy , ion , organic chemistry , chromatography , computer science , programming language
Black single crystals of nine ternary iodides A II MI 4 (A = Sr, Ba, Nd, Sm, Eu; M = La, Ce) have been obtained from reactions of the metals A with the triiodides of M in sealed tantalum containers at elevated temperatures. They all crystallize isotypically with BaLaI 4 (monoclinic, I2/a, Z = 4). The most important structural feature are chains of face‐sharing square antiprisms [MI 8 ] in accord with the formula A[MI 8/2 ]. M‐M distances are, on the average, 370.6 and 367.9 pm for M = La and Ce, respectively. With all M‐M distances equal, these iodides are expected to be one‐dimensional metals according to the formulation (A 2+ )(M 3+ )(e ‐ )(I ‐ ) 4 with the excess electron residing in a 5d band.