GAS-PHASE REACTIONS OF C-60 WITH THE ION SYSTEMS OF CYCLOHEXANE AND CYCLOHEXENE

The DCI MS of C-60 with the reactions of gaseous cyclohexane and cyclohexene have been studied. Several kinds reactions of C-60 have been observed. The results show that the gasphase C-60 has very active chemical properties. The adduct ions of [C60C4H7](+) and [C60C5H7](+) may be formed by [2+4] cycloaddition where one of double bonds of C-60 acted as a dienophilic unit.

GAS-PHASE SYNTHESIS OF DERIVATIVE OF C-60-C60S+

Gas phase ion-molecular reactions of C-60 with the ion system of CS2 have been studied in the ion source of mass spectrometer. It was found for the first time that the sulfuric derivative of C-60-C60S+ was the main ions in the ion source, they did not react with C-60 to form adduct ions due to their highly saturated structures. According to the dynamic analysis, the product ion came from the reaction of C-60 with the fragment ion S+. The adduct ion may have the structure of epsulfide that is advantageous in energy.

GAS-PHASE ION-MOLECULE REACTIONS OF BUCKMINSTERFULLERENE C-60 WITH SOME SMALL ORGANIC-COMPOUNDS IN MASS-SPECTROMETER

In chemical ionization mass spectrometry (CIMS) gas phase C-60(+) or C-60 can react with fragment ions from three chloromethane and four multichloroethane molecular ions via ion-molecule reactions. A dozen of gas-phase adduct ions of C-60 are observed, and most of them contain chlorine atoms. The results of the comparison and analysis show that the relative intensities of adductions are not directly proportional to the corresponding fragment ions in the MS of reagents,which implies that some fragment ions containing radicals are more reactive with C-60(+) or C-60. This indicates that the alkene-like C-60(+) or C-60 can act as a radical sponge in addition reactions.

GAS-PHASE ACETYLATION OF C-60 AND C-70 BY ION/MOLECULE REACTIONS

Gas phase reactions of C-60 and C-70 with the ion system of acetone under chemical ionization conditions have been studied. C-60 and C-70 can react with acetyl and oxonium ions, which come from self-chemical ionization of acetone, to form adduct ions. In addition, C-60 and C-70 can accept protons to produce protonated ions. C-70 is more active in the above reactions than C-60 because of its stronger gas-phase basicity. A sigma-bond between C-60 and an acyl carbon atom can be formed to produce stable acetylated C-60 ions. The above results may be relevant to the acetylation reactions of C-60 in the condensed phase.

Gas-phase Ion-molecular Reactions of C-60 and C-70 with Acetone and Quantum Chemistry Study

Gas-phase ion-molecular reactions of C-60 and C-70 with the ion system of acetone have been studied in this paper. The ions of protoned and acetylized C-60 and C-70 were formed by the reactions of C-60 and C-70 with some ions which existed in the ion system when mass spectrometer worked on chemical ionization conditions. The reactivity of C-70 is greater than that of C-60. Results of quantum chemical calculation for the adduct ions showed a sigma bond between the acyl carbon atom and C-60 may be Formed. These results will provide some valuable informations on the condense-phase acetylization of C-60.

C_（60）硫衍生物──C_（60）S~＋的气相合成

Ｃ_（６０）硫衍生物──Ｃ_（６０）Ｓ~＋的气相合成刘子阳，郝国仑，郭兴华，刘淑莹（中国科学院长春应用化学研究所，长春，１３００２２）关键词Ｃ_（６０），ＣＳ_２，离子－分子反应自实现Ｃ（６０）的宏观量合成以来［１］，通过将Ｃ（６０）进行化学衍生进而改变?..

C_(60)与环己烷及环己烯离子体系的气相反应

在气相条件下研究了C_(60)与环己烷及环己烯的离子-分子反应.C_(60)可与上述体系中多种离子发生反应,生成相应的加合离子,表现出C_(60)化学性质的活泼性和多样性.C_(60)与C_4H_7~+和C_5H_7~+离子反应可能生成[2+4]环加成的加合离子.

C_(60)与某些有机小分子的气相离子-分子反应

气相C_(60)在化学电离质谱中分别与3种氯代甲烷和4种氯代乙烷的分子离子及其碎片离子发生气相离子-分子反应,观察到C_(60)的几十种气相加合离子(其中绝大多数为含氯原子的).通过对比分析认为,C_(60)的加合离子丰度并不与反应物氯代烷中相应碎片离子丰度成顺变关系,某些含自由基的碎片离子(或自由基)与C_(60)(或C~+-(60))表现出更强的反应活性,这体现了C_(60)作为烯烃的吸自由基特性.

气相中C_(60)与多氯代乙烷的反应

在质谱仪离子源化学电离条件下.C_(60)分别与1,2-二氯乙烷、1,1,2-三氯乙烷、1,1,1-三氯乙烷及1,1,2,2-四氯乙烷的主要碎片离子反应,生成多种C_(60)的加合离子.显示了气相中C_(60)的化学活泼性.

中性氧化铝用于碳-60、碳-70柱分离的探讨

自90年实现实验室合成C_(60)/C_(70)以来,碳原子簇化学引起世界各国科学家的广泛兴趣,纷纷开展与其相关的各项研究。由电阻加热法、电孤法产生的烟灰经过甲苯(或苯)抽提便可得到C_(60)/C_(70)混合溶液,但其大量分离却很困难。Hawkins等用苯基甘氨酸做基底的HPLC方法和Jinno等用多取代苯基修饰的二氧化硅作固

富勒烯碳-60,碳-70的电化学研究进展

短短的几年,随着各种物理与化学研究方法的相继介入,以C_(60)和C_(70)为代表的富勒烯研究取得了令人瞩目的成就。跟踪最新进展,引文41篇,本文就其电化学方面的研究工作做了系统的综述。

气相C_(60)与甲苯、氯化苄和对二甲苯反应研究

在质谱离子源内,气相C_(60)分别与甲苯、氯化苄、对二甲苯产生的主要碎片离子及自由基反应,生成了C_(60)的多种气相衍生物离子,表明气相下C_(60)具有很活泼的化学性质。

C_(60)与苯及氘代苯的气相反应

1985年Kroto首先用质谱在激光蒸发石墨的氦气氛中检测到丰度占优势的以C_(60)和C_(70),从而以质谱法为主要手段的C_(60)研究迅速开展起来。一系列实验结果支持了Kroto猜测的C_(60)球形结构,并对C_(60)的气相反应行为有所认识。 1990年实现宏观量制取C_(60)后,气相C_(60)离子的研究内容更加广泛,Frieser在气相中