11B NMR spectra of boranes, main-group heteroboranes, and substituted derivatives: factors influencing chemical shifts of skeletal atoms

Article Abstract:

Its 80.4% natural abundance, high-frequency resonance, sensitivity to perturbations, wide spectral span, optimum B-H coupling, acceptable half-height widths and short relaxation times make boron-11 a very practical isotope in the nuclear magnetic resonance (NMR) spectra of compounds with boron skeletons. A boron-13 NMR study of boranes, heteroboranes and their derivatives is presented. Emphasis is laid on the chemical shifts in B-skeletons, spectral-structural relationships of B-cluster compounds and the effects on the boron-11 chemical shift of heteroatom substitution at the B(H) vertex and of substitution for an exo-terminal H atom.

Isotopes, Nuclear magnetic resonance spectroscopy, Boron, Boron (Chemical element)

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Vibrational spectroscopy of carboranes and parent boranes and its capabilities in carborane chemistry

Article Abstract:

New developments in laser Raman and Fourier transform spectral resolution offer new areas for practical use of vibrational spectroscopy in carborane chemical analysis. All such studies, especially of carboranes and parent closo-boranes, since 1963 are presented in review. Emphasis is laid on unique vibrational properties of caged systems caused by their structural rigidity. Two noteworthy examples, one on the molecular mobility and phase transitions of solid-state carboranes and the other on the role of carboranes as CH proton donors in hydrogen bonding, are discussed in detail.

Infrared spectroscopy, Raman spectroscopy

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Carboranes other than C2B10H12

Article Abstract:

Carboranes are polyhedral boron cluster compounds with one or more boron vertices replaced by carbon. The presence of carbon in the skeletal cage improves the relative stability of carboranes vs unsubstituted boranes. In such an electron-deficient environment, carbon atoms also cause structural effects that make possible unique skeletal and exoskeletal reaction behavior. The theoretical foundations of this carbon-boron structural relationship as well as the details of the synthesis, structures and properties of mono-, di-, tri- and tetracarbaboranes are presented.

Organic compounds, Organic compound synthesis

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