Reduced halides of yttrium with strong metal-metal bonding: yttrium monochloride, monobromide, sesquichloride, and sesquibromide

Journal Article · Tue Jul 01 04:00:00 EDT 1980 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50209a057· OSTI ID:5068476

Mattausch, H J ^[1]; Hendricks, J B; Eger, R; Corbett, J D; Simon, A

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1. Max-Planck-Institut fuer Festkoerperforschung, Stuttgart, Germany

Reaction of Y with YCl/sub 3/ or YBr/sub 3/ in sealed tantalum capsules at 1000 to 1150/sup 0/K leads to the new compounds YCl, YBr, Y/sub 2/Cl/sub 3/, and Y/sub 2/Br/sub 3/. All products were characterized by modified Guinier techniques, which led to the following lattice parameters: YCl (hexagonal), a = 374.8 (1), c = 273.8 (9) pm; YBr, a = 380.6 (1), c = 2915.8 (4) pm; Y/sub 2/Cl/sub 3/ (monoclinic), a = 1514.4 (3) pm, b = 382.5 (1) pm, c = 1007.7 (2) pm, ..beta.. = 118.24 (2)/sup 0/; Y/sub 2/Br/sub 3/, a = 1646.3 (2) pm, b = 389.8 (1) pm, c = 1069.5 (2) pm, ..beta.. = 120.08 (1)/sup 0/. YCl and YBr are isotopic with ZrBr and ZrCl, respectively, while Y/sub 2/Cl/sub 3/ and Y/sub 2/Br/sub 3/ crystallize in the space group C2/m and are isotypic with Gd/sub 2/Cl/sub 3/. The structure of Y/sub 2/Cl/sub 3/ was refined on the basis of single-crystal diffractometer data by least-square techniques (R = 0.048, R/sub w/ = 0.058, Mo K..cap alpha..). The structure consists of parallel infinite chains of composition Y/sub 4/2/Y/sub 2/Cl/sub 4/Cl/sub 2/ formed by condensing M/sub 6/X/sub 8/-type clusters via trans edges, the shorter metal-metal distances being 326.6 (2) (shared edge), 363.8 (2), and 369.4 (2) pm. A detailed consideration of distances suggests predominantly ionic bonding between Y and Cl with metal-metal bonding within the chains. A discussion is given of the fact that M-M distances in Y/sub 2/Cl/sub 3/ are 7 to 11 pm less than those in Gd/sub 2/Cl/sub 3/, in contrast to their nearly identical metallic radii.

• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5068476
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 19:7; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BROMIDES
BROMINE COMPOUNDS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HEXAGONAL LATTICES
LATTICE PARAMETERS
METALS
MONOCLINIC LATTICES
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
YTTRIUM
YTTRIUM BROMIDES
YTTRIUM CHLORIDES
YTTRIUM COMPOUNDS