A nuclear magnetic resonance relaxation study of liquid hydrogen cyanide
A nuclear magnetic resonance relaxation study of liquid hydrogen cyanide
复制标题
液态氰化氢的核磁共振弛豫研究
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
R. Wasylishen
中科院分区：
文献类型：
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作者：
R. Wasylishen
本文研究了液态氢氰化物的2H、13C和14N自旋晶格驰豫速率随温度的变化。四极核的弛豫完全由四极弛豫机制控制，而13C和15N的弛豫速率完全由自旋-旋转机制控制。描述所有原子核的自旋-晶格弛豫随温度变化的表观活化能约为1.6kcal/ ·−~(-1)。尽管分子间相互作用对核四极耦合常数和适当平均的C-H键分离的影响阻碍了非常精确的转动和角动量关联时间的测定，但对于dCN和hcn，所得到的关联时间是合理的(± 15%)。
The rates of 2H, 13C, and 14N spin-lattice relaxation for liquid deuterium cyanide have been studied as a function of temperature. The quadrupolar nuclei relax exclusively by the quadrupolar relaxation mechanism while the rate of 13C and 15N relaxation is completely dominated by the spin-rotation mechanism. The apparent activation energy that describes the temperature dependence of spin-lattice relaxation for all nuclei studied is approximately 1.6 kcal mol−1. The temperature dependence of the rate of 13C relaxation in liquid HCN was also investigated. Although the determination of very accurate rotational and angular momentum correlation times is hampered by intermolecular effects on the nuclear quadrupolar coupling constants and the appropriately averaged C—H bond separation, the derived correlation times for DCN and HCN are in reasonable agreement (± 15%).