共查询到19条相似文献,搜索用时 156 毫秒
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Wilson等人曾研究过碘代烷在266nm的激光光解RI→R+I*(~2P_(1/2))(1)RI→R+I(~2P_(3/2))(2)由于他们所用的光解产物谱仪不能改变产物的检测方向,因而对C_2H_5I,n-C_3H_7I和i-C_3H_7I的光解通道(1)和(2)在飞行时间(TOF)谱上的分离没有成功。我们用束源可转动的分子束激光裂解产物谱仪(飞行距离531mm)研究了CH_3I和C_2H_5I在248nm的激光裂解后,又分别对n-C_3H_7I和i-C_3H_7I进行研究,并实现了I*(~2P_(1/2))和I(~2P_(3/2))光解通道在TOF谱上的分离,测得光解通道比见表1。 相似文献
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《无机化学学报》2017,(9)
利用异丙基苯硫醚与丁基锂反应后,再依次与羰基铁和碘反应制得了碘桥双核邻异丙硫基苯甲酰基铁配合物[(o-~iPrS)C_6H_4COFe(CO)_2I]2,而苯甲硫醚类似的反应却仅得到单核苯硫甲基铁配合物C_6H_5SCH_2Fe(CO)_3I。当与亲核试剂作用时,这2个化合物表现出显著不同的反应活性。如双核配合物[(o-~iPrS)C_6H_4COFe(CO)_2I]2与2-吡啶硫醇钠(Py SNa)反应得到单核配合物(o-~iPrS)C_6H_4COFe(CO)_2(SPy),但单核配合物C_6H_5SCH_2Fe(CO)_3I与Py SNa反应导致其分解。另一方面,单核配合物C_6H_5SCH_2Fe(CO)_3I与三苯基膦(PPh3)反应得到羰基取代配合物C_6H_5SCH_2Fe(CO)_2(PPh3)I,但是双核配合物[(o-~iPrS)C_6H_4COFe(CO)_2I]2类似的反应却导致其分解,没有获得可表征的化合物。所有新合成的化合物都通过了核磁与红外光谱的表征,它们的结构也获得了X射线单晶衍射的确证。 相似文献
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本文报道了对C_6H_6+AlCl_3+CHCl_3,C_6H_6+AlCl_3+CCl_4,C_6H_6+AlCl_3+CDCl_3,C_6H_6+AlCl_3+CBr_4等体系的ESR研究结果。发现上述四种反应体系具有共同的自由基中间体。借助于计算机解谱得到它的超精细偶合常数分别是:6个完金等性的氢(I=1/2),a_H=2.10G;2个完全等性的铝(I=2/5),a_(Al)=0.45G。推测其可能的结构为:Cl_3Al←C_6H_6→AlCl_3。本文还对C_6H_6+AlCl_3+CHCl_3和C_6H_6+AlCl_3+CCl_4两体系的相对电导率随反应时间的变化和反应温度随反应时间的变化作了测定。发现电导率曲线和反应温度曲线变化是同步的。当反应停止后,电导率维持一定值。根据实验结果,提出该反应可能遵从自由基机理。 相似文献
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本文阐明了(RO)_2S=P(S)_nS=P(OR)_2 (R=CH_3,C_2H_5;n=2,3,4)与R_2~'NH(R'=C_2H~6,iC_6H~7)的反应。从几个方面证明其反应产物之一,就是相应二硫代磷酸酯的胺盐:(RO)_2S=PS~-·H_2+NR_2~'。反应过程中所有S-S键断裂,从而证明上述有机磷多硫物不是R_n~'NH的烷基化试剂。反应提供了合成(C_3H_5O)_2S=P SN(C_2H_5)_2,(C_2H_5O)_2S=PS~-·H_2+N(C_2H_5)_2和(C_2H_5)_2NSN(C_2H_5)_2的新路线。 相似文献
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用阶跃过渡应答技术研究了乙烷氧化脱氢反应的反应物C_2H_6,O_2,产物C_2H_4和主要副产物CO_2在MoO_3-V_2O_5/Al_2O_3催化剂上的吸附行为。结果表明:C_2H_6和C_2H_4在该催化剂上不吸附;氧为慢吸附、不可逆吸附;CO_2为可逆吸附,吸附量较小。并发现在无氧的条件下,乙烷能与催化剂表面上的晶格氧反应生成乙烯。这些结果对乙烷氧化脱氢反应机理的探讨有重要意义。 相似文献
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利用激光诱导荧光技术研究Ca(1S0)与氯代乙烷的反应 总被引:2,自引:0,他引:2
The internal state distributions of nascent CaCl formed in the reactions Ca + (1,1) and (1,2) C_2H_4Cl_2、(1,1,2) C_2H_2Cl_3, (1,1,2,2) C_2H_2Cl_4 have been studied by means of the laser induced fluorescence (LIF) in the beam-gas apparatus. The results showed that the vibrational distributions of the CaCl products from Ca+ (1, 1) C_2H_4Cl_2. (1,1,2,2) C_2H_2Cl_4 are similar to vibrational distributions of the CaCl products from Ca + CH_2Cl_2、CHCl_3, respectively. However, the vibrational distribution of the CaCl product from Ca+(1,1,2) C_2H_3Cl_3 is equivalent to the combination of that from Ca+(1,2) C_2H_4Cl_2 and Ca+(1,1,2,2) C_2H_2Cl_4. No LIF signal has been found in the reaction Ca+(1,1) C_2H_4Cl_2. 相似文献
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Under single-collision beam-gas scattering conditions the reactions Ba+ C_2H, Br、n-C_3H_7Br、1, 2-C_2H_4Br_2、1,3-C_3H_6Br_2 have been studied using laser induced fluore-scence to detect the BaBr X~2∑~+ product. The vibrational distributions, the fractions of the available energy going into vibrational and rotational energy of the BaBr products have been calculated by means. of computer simulation. It has been found that the average vibrationel energies of the BaBr products can be described as a linear function of the mass factors for the reactions Ba+CH_3Br、C_2H_5Br、n-C_3H_7Br、1,3-C_3H_6Br, and that the potential energy surfaces for these reactions are similar. For the reactions Ba+CH_3Br、C_2H_5Br、n-C_3H_7Br, the vibrational increae, but for the reactions Ba+CH_2Br_2、1,2-C_2H_4Br_2、1,3-C_3H_6Br_2, the vibrational excitations of the BaBr products decrease greatly when the number of the carbons increase. 相似文献
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《Chemical physics letters》1987,136(2):187-191
The reactions of F atoms with C2H5I, C2F5I, and n-C3H5I were studied by the crossed beam laser-induced fluorescence techniques within the 570–620 nm wavelength region. The vibrational and rotational excitation spectra of the reaction product IF were measured. The relative vibrational population densities of v = 3,4, and 5 vibrational levels, and some of the relative detailed vibrational rate constants, the rotational temperatures, and the mean fractions of rotational energy in individual vibrational states of the reaction product IF were obtained. The reaction mechanism was discussed. 相似文献
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A novel experimental technique has been developed to measure the attributes of product pair correlation of bimolecular reactions under the crossed molecular beam condition. The first system that we picked is F + CD4/CHD3 / CH4 reactions. By combining a crossed molecular beam method with a time-sliced ion velocity imaging technique,the product state-resolved pair-correlated differential cross sections were revealed directly from the measurements. Several facets of the product pair correlation have been explored. The dependence on the collisional energy has been elucidated. The pair-correlated angular distributions show strong dependences on the HF/DF vibrational quantum numbers,and weaker yet not negligible dependences on the methyl radical vibrational quantum numbers. For the F + CH4 reaction at collisional energies close to the reaction threshold,the first experimental evidences of a reactive resonance in a polyatomic reaction were discovered. The product pair-correlated information helps us to unravel the complexity of polyatomic reactions and offers the important link between A + BC type of reactions and more general polyatomic reactions. 相似文献
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C2H3自由基与O2反应的红外发射光谱及反应通道 总被引:2,自引:0,他引:2
The reaction of vinyl radicals with oxygen was investigated by Time-Resolved Fourier Transform infrared emission spectroscopy. The radicals were produced by the pulsed laser photolysis of C_2H_3Br at 248 nm. Vibrationally excited products of H_2CO(v1), HCO(v3), CO_2(v3, v), CH_3(v3), C_2H_2(v3), HO_2(v1), C_2H_2O_2(v3+v11), CO(v) formed in the C2H3+O_2 reaction have been observed. Four elementary reaction channels have been verified. 相似文献
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KrF激光诱导BrC2F4Br+C2H4反应 总被引:1,自引:1,他引:0
激光诱导化学合成是一有兴趣的课题。不久前已报导了红外激光诱导调聚反应的结果。由于红外激光的加热特性,在许多情况下导致选择性与量子产率的矛盾。因紫外光反应的低温特性,有可能获得较高的选择性。但普通光源是宽带光源,对一个以平方断链为主的链反应,过强的吸收不利于链长的提高,而弱吸收又使反应速度太慢。为此,激光光源是满足最佳吸收的合宜光源。在使用了昂贵的激光光源后,经济上的合理性主要取决于链长 相似文献
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不饱和多原子C2H3自由基在碳氢化合物燃烧过程中起着非常重要的作用,其各种基元反应影响整个燃烧过程的速率和形成的产物[1-3].Gutman和合作者[6]测量了总包反应在室温的速率常数((1. 06±0. 21) ×10-11cm3· molecule-1· s-1),仅检测到HCO和H2CO两个反应产物,Slagle和合作者[7]使用光电离质谱法研究了温度在299-1005 K范围内,宏观反应的Arrhen-nius表达式 k=(6. 92±0. 17)×10-12exp((120±12)/ T) cm… 相似文献