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THE STUDY ON SYNTHESES AND SOLID-STATE PROPERTIES OF INTERSTITIAL COMPOUNDS BASED ON THE MOLECULAR INTERSPACE ELUCIDATED BY MEANS OF POSITRON ANNIHILATION

基于正电子湮灭阐明分子间隙的间隙化合物的合成及固态性质研究

基本信息

批准号：
06640753
负责人：
SANO Mizuka
金额：
$ 1.54万
依托单位：
INTERNATIONAL CHRISTIAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Alkali-metal-saturation-doped fullerides M_6C_<60> (M=K, Rb, Cs) showed three positron lifetime components ; 0.21-0.24, 0.60-0.75, and 3.2-3.7 ns. The 1st component was assigned to arise from the free annihilation of positrons with electrons inside and around C_<60> molecules in the crystals, the 2nd one from the annihilation on the surfaces of the crystals, and the 3rd one from the annihilation through ortho-positronium (o-Ps). Pure C_<60> crystals showed only a single component of 0.427 ns. The substitution of Na^+ in the van der Waals gaps of montmorillonite with Al^<3+>, Zn^<2+>, Pb^<2+>, Cu^<2+>, Mg^<2+> was found to forminorganic interstitial compounds, and that with alkylammoniums to form the monmorillonites of which gaps are filled with long alkyl chains. The h parameters of Doppler-broadening spectra, 0.55-0,58 ; and the 2nd lifetime components, 1.12-1.74 ns, for these montmorillonites are found to have a good correlation with the values observed for their original alkylammonium salt crystals, which demonstrates that the positron annihilation occurs in the region of van der Waals gaps. Further incorporation of oxine into the inorganic interstitial compounds formed metal-oxine-complex-including montmorillonites. Al-oxine and Mg-oxine complexs showed the same fluorescence spectra when they were incorporated into the van der Waals gaps of montmorillonite, but Zn-oxine compex showed fluorescence blue shift of 12 nm when it was inserted into the gaps of montmorillonite. Graphite-potassium intercalation compound, KC_8, was found to generate o-Ps.

碱金属饱和掺杂的富勒烯化合物M_6C_<60>（M=K，Rb，Cs）具有三个正电子寿命分量：0.21-0.24，0.60-0.75和3.2- 3.7ns。第一个分量来自晶体中C_2分子内部和周围的正电子与电子的自由湮灭<60>，第二个分量来自晶体表面的湮灭，第三个分量来自正电子偶素（o-Ps）的湮灭。纯C_2<60>晶体只有0.427ns的单分量。Al^<3+>、Zn^<2+>、Pb^<2 +>、Cu^<2 +>、Mg^<2+>取代蒙脱石货车德瓦耳斯间隙中的Na^+形成无机间隙化合物，烷基铵取代蒙脱石形成长烷基链填充的蒙脱石。这些蒙脱石的多普勒展宽谱的h参数为0.55- 0.58，第二寿命分量为1.12-1.74 ns，与它们的原始烷基铵盐晶体的观测值有很好的相关性，这表明正电子湮没发生在货车德瓦耳斯能隙区域。8-羟基喹啉进一步掺入到无机间隙化合物中形成含8-羟基喹啉金属络合物的蒙脱石。Al-8-羟基喹啉和Mg-8-羟基喹啉复合物插入蒙脱石的货车德瓦耳斯能隙后，其荧光光谱基本一致，而Zn-8-羟基喹啉复合物插入蒙脱石能隙后，其荧光光谱蓝移了12 nm。发现KC_8能生成o-Ps。