ISSN:
1573-9171
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Conclusions 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. 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. 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00920682
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