Carboranes and Organo-Substituted Boron Hydrides

Onak, Thomas

doi:10.1016/s0065-3055(08)60040-4

Cited by 24 publications

(2 citation statements)

References 289 publications

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“…Thus, in terms of the generalized rate expression1 -d[S]/dr = [S][/C] + k2(H+)], ki « t2(H+) over the investigated range of pH. (18) Band positions and conclusions regarding relative rates of N-H and B-H exchange as well as relative rates of B-H exchange and hydrolysis of 3• 3 are consistent with previous findings; M. G. Hu, J. M. Van…”

mentioning

confidence: 99%

Rearrangement of mono- and poly-B-methyl derivatives of 2,4-closo-dicarbaheptaborane, 2,4-C2B5H7

Onak¹,

Fung²,

Siwapinyoyos³

et al. 1979

Inorg. Chem.

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mentioning

confidence: 99%

Rearrangement of mono- and poly-B-methyl derivatives of 2,4-closo-dicarbaheptaborane, 2,4-C2B5H7

Onak¹,

Fung²,

Siwapinyoyos³

et al. 1979

Inorg. Chem.

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“…It is well-known that α- and β-polymorphs of boron and other boron-containing compounds, such as B 12 H 12 2- and B 12 C 2 H 12 , adopt 12-membered icosahedral polyhedra. − Due to the electron deficiency of boron, polyhedral boranes are formed by multicenter 3-center 2-electron bonding, and Wade's rules are often used to explain the bonding in these closo -clusters . Be compounds are similarly electron deficient, but polyhedral Be clusters are extremely rare.…”

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confidence: 99%

Rare Beryllium Icosahedra in the Intermediate Valence Compound CeBe₁₃

et al. 2004

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Single-crystal X-ray diffraction experiments show that the Be atoms in CeBe13 form a Be12 icosahedra, which is a very unusual structural feature due, in part, to the remarkably low valence electron count of Be. Magnetization studies show that CeBe13 displays intermediate valence behavior, in which valence fluctuations between the Ce 4f0 and 4f states give rise to enhanced electronic specific heat and magnetic susceptibility. Calculations using ab initio theory were used to determine the electronic structure and bonding and to give insight into the relationship between the crystal structure, the bonding, and the intermediate valence behavior of CeBe13. The hybridization between the localized f electrons and the conduction electrons is responsible for the large values of the electronic specific heat coefficient (γ ≈ 100 mJ/mol K) and magnetic susceptibility (χ ≈ 1 × 10-3 emu/mol), which is in marked contrast to those of ordinary metals that have γ ≈ 1 mJ/mol K2 and χ ≈ 1 × 10-5 emu/mol values. The magnetic susceptibility, χ = M/H versus T, of a single crystal of CeBe13 exhibits a broad maximum at T max ≈ 130 K and is typical of intermediate valence systems with an unusually large energy scale (Kondo), T K ≈ 500 K.

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