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人们知道,硝基芴酮是类强电子受体化合物,可与咔唑等电子给体形成电荷转移复合物,具光导性而用于静电复印和感光胶片研究中。我们曾对这类作为电子受体的电荷转移复合物做了系统的研究,包括用X-射线光电子能谱(XPS)确定了硝基芴酮与N-乙基咔唑电荷转移复合物的电荷转移量(p)。但是共轭π体系作为给体的硝基芴酮电荷转移复合物至今未有文献报道。为此,我们合成了不同硝基芴酮与芴的电荷转移复合物。本文报道这类电荷转移复合物的XPS研究,实验结果不但明确表明复合物的形成,同时,按照Grobman等对TTF-TCNQ的XPS研究中所建议的相对面积法求算了这种共轭π体系的电荷转移量(p)。因而本术是体现共轭π体系电子电荷转移的明显例证。
It is known that nitrofluorenone is a strong electron acceptor compound that forms charge transfer complexes with electron donors such as carbazole and is photoconductive for use in electrophotographic and photographic film research. We have systematically investigated this class of charge-transfer complexes as electron acceptors, including the determination of the charge of the nitrofluorenone and N-ethylcarbazole charge-transfer complexes by X-ray photoelectron spectroscopy (XPS) Transfer amount (p). But the conjugate π system as a donor nitrofluorenone charge-transfer complex has not been reported in the literature. For this purpose, we synthesized charge-transfer complexes of different nitrofluorenones and fluorenes. In this paper, the XPS study of charge-transfer complexes of this kind is reported. The experimental results not only indicate the formation of complexes, but also calculate the conjugate π system according to the relative area method proposed by Grobman et al. In XPS study of TTF-TCNQ Of charge transfer amount (p). Therefore, this technique is a clear example of the electronic charge transfer of the conjugated π system.