Metal-Metal Bonding and Interstitials in Reduced Rare-Earth Metal Halides

摘要

Exploratory research in recent years has shown the rare-earth elements in their highly reduced halides exhibit a remarkable ability to undergo cluster formation, some as isolated units and others as infinite chains or slabs containing double-metal layers. Only a few of the elements have been studied in any detail, principally scandium, yttrium and gadolinium. Many of these new compounds are uniquely stabilized by a second-period element bound within each cluster, for example, in Sc sub 7 Cl sub 12 B, Sc sub 5 Cl sub 8 C, Y sub 2 Cl sub 2 C and Li/sub y/YClH/sub x/, although a few structures evidently represent true binaries, e.g., with Sc sub 7 Cl sub 10 and Y sub 2 Cl sub 3 . The known phases and their structures are briefly reviewed, and some relevant information from extended-Hueckel band calculations and uv photoelectron spectroscopy noted. 28 refs. (ERA citation 11:036471)