Chemical shielding tensors of 13C in solid dimethyl oxalate
Chemical shielding tensors of 13C in solid dimethyl oxalate
复制标题
固体草酸二甲酯中 13C 的化学屏蔽张量
DOI：
10.1063/1.1681041
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发表时间：
1974
影响因子：
4.4
通讯作者：
E. Abramson
中科院分区：
文献类型：
--
作者：
A. Pines;E. Abramson
我们最近报道了酒石酸铵单晶中酒石酸根的羟基和羧基对~(13)C的全化学屏蔽张量。1，2这些张量开始揭示化学屏蔽的本质和各向异性，并开始出现一些趋势。然而，很明显，这一领域虽然很有希望，但仍处于非常初步和过早的阶段，在可以推断任何可靠的概括或开发对屏蔽理论的关键测试的任何基础之前，需要进行进一步的测量。在这篇通讯中，我们提供了一份关于在二甲氧草酸单晶中测量~(13)C屏蔽张量的初步报告。这些张量应该有助于与其他报道的碳氧基团的完整测量结果进行比较：二苯甲酮中的13C=O，酒石酸盐中的13C-OH和13C02，方解石中的1，2和13CO。4.
We recently reported the full chemical shielding tensors for 13C in the hydroxyl and carboxyl groups of tartrate ion in single crystals of ammonium tartrate. 1,2 These tensors are beginning to shed some light on the nature and anisotropy of chemical shielding, and some trends are beginning to emerge. It is clear, however, that this area, although promiSing, is at a very preliminary and premature stage, and further measurements are necessary before any reliable generalizations can be inferred or any basis for critical testing of shielding theories can be developed. In this Communication, we present a preliminary report of the 13C shielding tensors measured in a single crystal of dimethyloxalate. These tensors should be useful for comparison with the only other reported full measurements in carbon-oxygen groups: 13C=O in benzophenone, 3 13C -OH and 13C02 in tartrate, 1,2 and 13CO; in calcite. 4