The electronic absorption spectra of the alkyl-substituted derivatives of bis(benzene)chromium(0) in the vapour phase
作者:G.A. Domrachev、S.Yu. Ketkov、G.A. Razuvaev
DOI:10.1016/0022-328x(87)80250-4
日期:1987.7
The UV and visible absorptionspectra of (arene)2chromium(0) (arene = benzene (I), toluene (II), ethylbenzene (III), cumene (IV), tert-butylbenzene (V), mesitylene (VI) in the vapourphase have been investigated. Four band systems A,B,C and D are revealed in the spectra. The bands of the system with the shortest wavelengths, D, represent the Rydberg series. The first ionisation potentials IPa1g, 5
(芳烃)2铬(0)(芳烃=苯(I),甲苯(II),乙苯(III),枯烯(IV),叔丁基苯(V),均三甲苯(VI)的紫外和可见吸收光谱光谱中揭示了四个能带系统A,B,C和D,波长最短的系统带D代表里德堡级数,第一电离能IP a 1 g,5.18和5.01 eV的分别。里德伯条带对应于所允许的跃迁electrodipole从最高占据分子轨道(MO)一个1克至任一的空MO一个2 ù或ë 1 ü类型。
Zero Kinetic Energy Spectroscopy: Mass-Analyzed Threshold Ionization Spectra of Chromium Sandwich Complexes with Alkylbenzenes, (η<sup>6</sup>-RPh)<sub>2</sub>Cr (<i>R</i> = Me, Et, <i>i</i>-Pr, <i>t</i>-Bu)
作者:Sergey Y. Ketkov、Heinrich L. Selzle、F. Geoffrey N. Cloke、Gennady V. Markin、Yury A. Shevelev、Georgy A. Domrachev、Edward W. Schlag
DOI:10.1021/jp104282r
日期:2010.10.28
assigned on the basis of calculated vibrationalfrequencies. The MATI spectra of compounds 3 and 4 reveal only one strong peak because of close ionization potentials of the isomers contributing to the MATI signal. The 3 and 4 ionization energies are 42104 ± 5 and 41917 ± 5 cm−1, respectively. The precise values of ionization energies obtained from the MATI spectra reveal a nonlinear dependence of the
在过去的25年中,零动能(ZEKE)光谱学为分子离子的高分辨率结果奠定了坚实的基础。这是基于60年代后期在整个分子离子电离连续体中长寿命离子状态的发现。这里,从该大学开创的另一个基本系统中选择一个示例。射流冷却铬bisarene络合物(η的质量分析阈电离(MATI)光谱6 -RPh)2的Cr(R =我(1),等(2),我-Pr(3),和吨-Bu(4))已根据DFT计算进行了测量和解释。配合物1和MATI的MATI光谱图2似乎揭示了由于一个芳环相对于另一个芳环的旋转而形成的异构体的电离所产生的特征。在1和2 MATI光谱显示对应于0 2个强峰0 0电离与逆强度比。如DFT计算所示,强度比从1变到2的变化是由于每个MATI峰都有不同的异构体引起的。对应于0 0 0峰的电离能对于化合物1为42746±5和42809±5 cm -1,对于复合物2为42379±5和42463±5 cm -1。在1层
Conversion of cyclohexenes into .pi.-complexed arenes
作者:M. C. Shepherd、R. Jagannathan、J. J. Lagowski
DOI:10.1021/ja00336a070
日期:1984.11
Nouvel acces aux composes bis(arene)-Cr(O) par generation d'intermediaires reactifs qui par addition d'un arene donne le complexe desire. Cas de la reaction des atomes de Cr avec les cyclohexenes
Nouvel acces aux composes bis(arene)-Cr(O) par generation d'intermediaires reactifs qui par add d'un arene donne le complexe wish。环己烯原子反应
Gas-phase electronic absorption spectroscopy of substituted bis(η6-benzene)chromium derivatives: Rydberg transitions in bis(η6-anisole)chromium and bis(η6-2,6-dimethylpyridine)chromium
作者:S. Yu. Ketkov、G. A. Domrachev、A. M. Ob’edkov、A. Yu. Vasil’kov、L. P. Yur’eva、C. P. Mehnert
DOI:10.1007/s11172-005-0051-8
日期:2004.9
Gas-phase electronic absorption spectra of chromium bisarene complexes with oxygen- and nitrogen-containing ligands, (η6-PhOMe)2Cr (1) and (η6-2,6-Me2C5H3N)2Cr (2), were first measured. Rydberg bands disappearing on going to the condensed-phase spectra were revealed. The first ionization potentials of complexes 1 and 2 (5.30 and 5.40 eV, respectively) were determined from the Rydberg frequencies. The Rydberg transitions were assigned and the corresponding Rydberg term values and quantum defects were determined. The effect of heteroatoms on the Rydberg structure parameters was revealed by comparing the spectra of complexes 1 and 2 with those of unsubstituted analogs. The appearance, in the ligand side chain, of an oxygen atom capable of being involved in conjugation with the π-electron system of the aromatic ring results in substantial broadening of the observed Rydberg bands. This can be associated with an increased ligand contribution to the HOMO of the sandwich compound. The influence of the oxygen atom on the ionization energy of the molecule is insignificant. In contrast to this, introduction of a nitrogen atom into the carbocycle leads to a noticeable increase in the ionization potential of the molecule, while the ligand contribution to the HOMO of the complex remains practically unchanged.
The reactions of bis-arene-chromium(O) with alkyl halides
作者:G.A. Razuvaev、G.A. Domrachev
DOI:10.1016/s0040-4020(01)98536-9
日期:1963.1
of these reactions are (1) the decomposition of the sandwich molecule with the formation of the salts of chromium and arene, and (2) the evolution of elementary hydrogen. It has been shown by the deuterium label that at least 16·5% of the hydrogen evolved is derived from the Arene2Cr0. Probably the reaction of Arene2Cr0 with RX consists of two competing reactions (1) the reversible oxidation of Arene2CR0