Conclusions
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1.
The NMR-13C spectra of the o-, m-, and p-isomers of dicarbaclosododecaborane-(12), carbaphosphaclosododecaborane-(12), carbaarsaclosododecaborane-(12), and l,10-dicarbaclosodecaborane-(10) were investigated, and the chemical shifts13C and spin-spin interaction constants SSIC JC-H and JC-P were determined, along with δ31p of the isomeric carbaphosphaclosododecaboranes-(12). The shift of13C and JC-H of carboranes is weakly influenced by such solvents as DMSO, THF, acetone, CH2Cl2, and CHCl3.
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2.
A correlation is observed between the SSIC of JC-H and the effective charge of the carbon atom of the carboranes. The values of JC-H are evidence of a hybridization of the orbital of carbon in the C-H bond in carboranes intermediate between sp- and sp2-hybridization, close to sp2.
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3.
Spin-spin interaction between the13C and31P nuclei, separated by boron atoms, is observed in the m-isomer and is not observed in p-phosphacarborane.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 801–805, April, 1975.
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Fedin, É.I., Antonovich, V.A., Rys, E.G. et al. Investigation of icosahedral carboranes by the method of13C NMR spectroscopy. Russ Chem Bull 24, 723–726 (1975). https://doi.org/10.1007/BF00920682
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DOI: https://doi.org/10.1007/BF00920682