Local order and metal-metal bonding in Li{sub 2}MoO{sub 3}, Li{sub 4}Mo{sub 3}O{sub 8}, LiMoO{sub 2}, and H{sub 2}MoO{sub 3}, determined from EXAFS studies

Journal Article · Wed Jan 18 04:00:00 EST 1995 · Inorganic Chemistry

DOI:https://doi.org/10.1021/ic00106a011· OSTI ID:75657

Hibble, S J; Fawcett, I D ^[1]

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1. Univ. of Reading (United Kingdom)

Molybdenum K-edge EXAFS studies have allowed determination of the local order in the layered materials Li{sub 2}MoO{sub 3}, Li{sub 4}Mo{sub 3}O{sub 8}, LiMoO{sub 2}, and H{sub 2}MoO{sub 3}. The presence of Mo{sub 3} metal-metal-bonded triangles in Li{sub 2}MoO{sub 3}, with d(Mo-Mo) = 2.580(1) {angstrom} (x2), is unequivocally demonstrated for the first time. This information cannot be obtained from diffraction experiments because the system is intrinsically disordered. Triangular clusters are also found in the related Mo{sup IV}-containing lithium molybdate Li{sub 4}Mo{sub 3}O{sub 8} and in H{sub 2}MoO{sub 3}, prepared from Li{sub 2}MoO{sub 3} by ion exchange (d(Mo-Mo) = 2.560(1) {angstrom} (x2) and 2.506(1) {angstrom} (x2), respectively). The metal-metal bonding in the Mo{sup III}-containing oxide LiMoO{sub 2} is shown to be more complex than diffraction studies had indicated. In LiMoO{sub 2}, Mo-Mo-bonded chains are formed, and the authors present a possible model containing disordered chains, with d(Mo-Mo) = 2.561(2) {angstrom} (x2) and 2.709(2) {angstrom} (x2), found in the MoO{sub 2} sheets.

• Sponsoring Organization: USDOE
• OSTI ID: 75657
• Journal Information: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 2 Vol. 34; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ABSORPTION SPECTROSCOPY
LITHIUM COMPOUNDS
MOLECULAR STRUCTURE
MOLYBDENUM OXIDES
X-RAY SPECTROSCOPY