Chains of centered metal clusters with a novel range of distortions: Pr[sub 3]I[sub 3]Ru, Y[sub 3]I[sub 3]Ru, and Y[sub 3]I[sub 3]Ir
- Iowa State Univ., Ames (United States) Texas A and M Univ., College Station (United States)
The phases R[sub 3]I[sub 3]Ru (R = La, Pr, Gd, Y, Er) and R[sub 3]I[sub 3]Ir (R = Gd, Y) are obtained from the reactions of R, RI[sub 3], and Ru or Ir for 3-4 weeks in sealed Ta tubing at 850-975C, depending on the system. The title phases have been characterized by single-crystal X-ray means at room temperature. The first phase contains quasi-infinite double chains of edge-sharing Pr[sub 6](Ru) octahedra that are sheathed and interbridged by iodine. An evidently continuous distortion of these chains parallels the a/b axial ratio (in the order listed in the first sentence) such that metal octahedra are no longer obvious in Y[sub 3]I[sub 3]Ir; rather chains of trans-edge-sharing square pyramidal Y[sub 4]Ir units bonded base-to-base are more apt. Increased R-R, R-interstitial, and interstitial-interstitial bonding appears to parallel the degree of distortion. Magnetic data for La[sub 3]I[sub 3]Ru and Pr[sub 3]I[sub 3]Ru and the results of extended Hueckel band calculations on Pr[sub 3]I[sub 3]Ru are reported. Polar covalent Pr-Ru interactions and at least a quasi-closed shell configuration are emphasized by the latter.
- OSTI ID:
- 7017414
- Journal Information:
- Inorganic Chemistry; (United States), Vol. 31:8; ISSN 0020-1669
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RARE EARTH COMPLEXES
MOLECULAR STRUCTURE
PHYSICAL PROPERTIES
AMBIENT TEMPERATURE
BINDING ENERGY
BOND ANGLE
BOND LENGTHS
IRIDIUM
MAGNETIC SUSCEPTIBILITY
MONOCLINIC LATTICES
MONOCRYSTALS
PHASE STUDIES
PRASEODYMIUM
REDUCTION
RUTHENIUM
X-RAY DIFFRACTION
YTTRIUM
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPLEXES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DIMENSIONS
ELEMENTS
ENERGY
LENGTH
MAGNETIC PROPERTIES
METALS
PLATINUM METALS
RARE EARTHS
SCATTERING
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties