Nuclear magnetic resonance in o-carborane
作者： E.C Reynhardt , A Watton , H.E Petch
DOI: 10.1016/0022-2364(82)90096-8
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摘要: Abstract Proton second moments and spin-lattice relaxation times T 1 ϱ were measured over the temperature range 320 > 77 K. In addition to known phase transition at 263 K, results revealed a 200 Phase III ( 1Q 22 msec. The activation energy of exchange mechanism is 6.0 ± 0.2 kcal/mol. II (263 K), (B) short (≈100 μsec) decays magnetization exponential. Dipolar interactions kind contribute significantly (H) in this phase. boron-carbon cage involved an anisotropic reorientation, probably about one twofold axes molecule. motion 5.5 0.1 I K) molecule executes isotropic reorientation with 4.3
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