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Infrared spectrum of CH_3CN-BF_3 in Solid Argon

机译:固体氩气中CH_3CN-BF_3的红外光谱

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摘要

We have observed and assigned several vibrational bands of 6 isotopomers of the CH_3CN-BF_3 complex in argon matrices. these include, for the parent isotopomer (CH_3CN-~(11)BF_3), the asymmetric BF_3 stretch (v_(13)) at 1248 cm~(-1), the BF_3 symmetric deformation or "umbrella" band (v_7) at 601 cm~(-1), and the C-N stretch (v_2) at 2365 cm~(-1). All of these bands require both CH_3CN-BF_3 and BF_3, grow slightly upon annealing to 20 K, display consistent relative intensities across all sample conditions studied, and have isotopic shifts that agree well with ab initio predictions. We observe the v_2 band of CD_3CN-BF_3 at 2363 cm~(-1), 17 cm~(-1) to the red of a prior observation, though still only 7 cm~(-1) from the frequency observed for crystalline CD_3CN-BF_3. The v_(13) and v_7 bands, however, are shifted by about 50 and 200 cm~(-1) from the corresponding bands in the crystal, respectively. In turn, this indicates that the structure and bonding of matrix-isolated CH_3CN-BF_3 must differ significantly from the crystalline form of the complex.
机译:我们已经观察到并分配了氩气基质中CH_3CN-BF_3配合物的6个同位素的几个振动带。对于母体同位异构体(CH_3CN-〜(11)BF_3),这些包括在1248 cm〜(-1)的不对称BF_3拉伸(v_(13)),在601的BF_3对称变形或“伞状”谱带(v_7) cm〜(-1),CN拉伸(v_2)在2365 cm〜(-1)。所有这些谱带都需要CH_3CN-BF_3和BF_3,在退火至20 K时会略微增长,在所有研究的样品条件下均显示出一致的相对强度,并且同位素位移与从头算相符。我们观察到CD_3CN-BF_3的v_2谱带在2363 cm〜(-1),17 cm〜(-1)到先前观察到的红色,尽管从晶体CD_3CN观察到的频率仍然只有7 cm〜(-1)。 -BF_3。但是,v_(13)和v_7谱带分别从晶体中的相应谱带偏移了50和200 cm〜(-1)。反过来,这表明基质分离的CH_3CN-BF_3的结构和键合必须与配合物的晶体形式显着不同。

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