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- W2034033585 abstract "Abstract The globular-shaped icosahedral carboranes, o -, m -, and p -C 2 B 10 H 12 , yield high-resolution 11 B and 13 C MAS solid-state NMR spectra. Chemical shifts and linewidths are comparable to those of solution spectra. Spin—lattice relaxation times indicate the quadrupolar mechanism to be dominant for the B-11 relaxation. Linewidths of spectra recorded at 96 MHz and 64 MHz were similar. At 298 K, the 13 C T 1 of p -carborane was found to be an order of magnitude smaller than those of the other two isomers. This can be attributed to the higher phase transition temperature of p -carborane indicative of the stronger intermolecular dipolar CH interactions made possible by the para -carbon vertices. Substitution on o -carborane by a methyl group yields spectra of comparable linewidths to those of the parent compound. Substitution by a bulkier phenyl group, however, results in extensive broadening of both 11 B and 13 C signals of the derivative 1-Ph- o -C 2 B 10 H 11 ." @default.
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- W2034033585 date "1988-01-01" @default.
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- W2034033585 title "High-resolution solid-state 11B and 13C MAS NMR of icosahedral carboranes" @default.
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- W2034033585 doi "https://doi.org/10.1016/0584-8539(88)80016-3" @default.
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