New examples of clusters, extended metal-metal bonding and interstitial derivatives

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5313168

Corbett, J D

Synthesis of many new compounds with unusual stoichiometries and with structures that exhibit strong metal-metal bonding has been achieved in the last 10 to 12 years in binary halides of the early transition metals. Such characteristics had previously been limited to metal octahedra in the wellknown (Nb,Ta)/sub 6/X/sub 12//sup n+/ and (Mo,W)/sub 6/X/sub 8//sub m+/ halide clusters (6-12 and 6-8 types, respectively; X= Cl, Br, I). This new chemistry is found for highly reduced binary halides of the metals Sc, Y, La, Zr, Hf and some lanthanides. The metal-metal arrays in these may be classified as conventional 6-12 or 6-8 type clusters that have, in response to reduced X:M ratios, condensed by sharing metal-metal edges to form infinite chains or sheets of clusters. The structures and properties thus lie along the interface between metals and normal salts. Some of the compounds have been found to bind a variety of small nonmetals within the metal interstices while others are uniquely stabilized by such interstitial atoms. Structure and bonding correlations as well as valence photoelectron spectra and extended Hueckel calculations will also be considered. 3 refs., 6 figs.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5313168
• Report Number(s): IS-M-547; CONF-8504163-1; ON: DE85015522
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BINDING ENERGY
CHEMICAL BONDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ENERGY
HALIDES
HALOGEN COMPOUNDS
INTERSTITIALS
MOLECULAR STRUCTURE
POINT DEFECTS
RARE EARTH COMPOUNDS
TRANSITION ELEMENT COMPOUNDS