Structure of graphite oxide revisited
Structure of graphite oxide revisited
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DOI：
10.1021/jp9731821
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发表时间：
1998-06-04
影响因子：
3.3
通讯作者：
Klinowski, J
中科院分区：
文献类型：
--
作者：
Lerf, A;He, HY;Klinowski, J
用C-13和H-1核磁共振研究了氧化石墨(GO)及其衍生物。GO衍生物的核磁共振谱证实了70ppm谱线归属于C-OH基团，并允许我们提出一个新的GO结构模型。因此，我们将60ppm的线分配给环氧基(1，2-醚)，而不是前面建议的1，3-醚，将130ppm的线分配给芳香族实体和共轭双键。GO含有两类区域：含有未氧化苯环的芳香区和含有脂肪六元环的区域。这两个区域的相对大小取决于氧化程度。碳网几乎是平的；只有附着在OH基团上的碳具有轻微扭曲的四面体构型，导致层的一些皱折：脱氧过程中苯酚(或芳香二醇)基团的形成表明环氧化物和C-OH基团彼此非常接近。每个被氧化的芳环中的官能团分布不必是相同的，并且被氧化的环和芳香族实体都是随机分布的。
Graphite oxide (GO) and its derivatives have been studied using C-13 and H-1 NMR. NMR spectra of GO derivatives confirm the assignment of the 70 ppm line to C-OH groups and allow us to propose a new structural model for GO. Thus we assign the 60 ppm line to epoxide groups (1,2-ethers) and not to 1,3-ethers, as suggested earlier, and the 130 ppm line to aromatic entities and conjugated double bonds. GO contains two kinds of regions: aromatic regions with unoxidized benzene rings and regions with aliphatic six-membered rings. The relative size of the two regions depends on the degree of oxidation. The carbon grid is nearly flat; only the carbons attached to OH groups have a slightly distorted tetrahedral configuration, resulting in some wrinkling of the layers: The formation of phenol (or aromatic diol) groups during deoxygenation indicates that the epoxide and the C-OH groups are very close to one another. The distribution of functional groups in every oxidized aromatic ring need not be identical, and both the oxidized rings and aromatic entities are distributed randomly.