Infrared Spectra of Methylidynes Formed in Reactions of Re Atoms with Methane, Methyl Halides, Methylene Halides, and Ethane: Methylidyne C−H Stretching Absorptions, Bond Lengths, and s Character
作者:Han-Gook Cho、Lester Andrews
DOI:10.1021/ic701505w
日期:2008.3.1
carbyne complexes (HC identical with ReH 3, HC identical with ReH 2X, HC identical with ReHX 2, [X = F, Cl, and Br] and CH 3C identical with ReH 3) are produced by reactions of laser-ablated Re atoms with methane, methyl halides, methylene halides, and ethane via oxidative C-H(X) insertion and alpha-hydrogen migration in favor of the carbon-metal triple bond. The stabilities of the carbyne complexes relative
of碳炔络合物(HC与ReH 3相同,HC与ReH 2X相同,HC与ReHX 2相同,[X = F,Cl和Br]和CH 3C与ReH 3相同)是通过激光烧蚀的Re原子反应生成的甲烷,甲基卤化物,卤甲烷和乙烷通过氧化CH(X)插入和α-氢迁移而有利于碳-金属三键。通过DFT计算可预测出卡宾配合物相对于其他可能产物的稳定性。在前体CH拉伸带的蓝色侧观察到与ReH 3相同的HC的诊断性亚甲基CH拉伸吸收,其频率按H,F,Cl的顺序降低且键长增加,和Br,跟随CH键杂交中s的降低。与单卤代物质相比,二卤代亚甲基具有更高的CH拉伸频率和s特征。methyl亚甲基具有C s结构,因此与ReH 3相同的HC和与ReH 3相同的CH 3C相同的HC,与WH 3与WH 3相同的亚甲基钨HC相比,具有两个相同的较短和一个较长的Re-H键。三个等价的WH债券。