Infrared spectroscopy of hydrogenated fullerenes (fulleranes) at extreme temperatures
Infrared spectroscopy of hydrogenated fullerenes (fulleranes) at extreme temperatures
复制标题
DOI：
10.1111/j.1365-2966.2012.21097.x
复制
发表时间：
2012-07-01
影响因子：
4.8
通讯作者：
Manchado, Arturo
中科院分区：
文献类型：
--
作者：
Iglesias-Groth, Susana;Garcia-Hernandez, D. A.;Manchado, Arturo
本文给出并讨论了氢化富勒烯（称为富勒烯）C60H36、C60H18和C70H38的红外光谱、各红外跃迁的综合摩尔吸收率（?）和摩尔消光系数（?），以及通常称为77% C60Hx和22% C70Hy （x类似于y bbbb30）的富勒烯混合物。最近发现它们的母分子C60和C70在太空中比最初想象的更丰富，存在于各种富氢的星周环境中，如行星状星云和只有轻度缺氢的R冕状星，以及星际介质中，这些数据对太空中富勒烷的搜索、鉴定和定量测定很有用。结果表明，富勒烷C60H36、C60H18和C70H38及其混合物的CH伸展带可能对这些分子的识别最有用，因为它们的？然后呢?价值观在力量方面是独一无二的，克服了迄今为止的典型？然后呢?参考分子如金刚烷和十二烷的值，以及典型的？脂肪分子的文献数据。与C60H36和C60H38相对简单的红外光谱相比，C60H18的两种异构体的红外光谱具有丰富的谱带，这可能比更高的同源物更容易识别。研究了富勒烷红外光谱与温度的关系，研究范围从-180℃到+250℃，外推至0 K。
The infrared spectra, as well as the integrated molar absorptivity (?) and the molar extinction coefficient (?) of each infrared transition of the hydrogenated fullerenes (known as fulleranes) C60H36, C60H18 and C70H38, and a mixture of fulleranes generally referred to as 77 per cent of C60Hx and 22 per cent C70Hy with x similar to y > 30, are presented and discussed. These data are useful for the search, identification and quantitative determination of fulleranes in space after the recent discovery that their parent molecules, C60 and C70, are more abundant in space than initially thought, being present in a variety of H-rich circumstellar environments such as planetary nebulae and only mild H-deficient R Coronae Borealis stars, and in the interstellar medium. It is shown that the CH stretching band of the fulleranes C60H36, C60H18 and C70H38, and their mixture may be most useful for the identification of these molecules because their ? and ? values are unique in terms of strength, overcoming by far the typical ? and ? values of reference molecules such as adamantane and docosane, as well as typical ? literature data for aliphatic molecules. In contrast to the rather simple infrared spectra of C60H36 and C60H38, the infrared spectra of two C60H18 isomers are reported as characterized by a rich number of bands which may allow an easier identification than the higher homologues. The dependence of the infrared bands of fulleranes on temperature was studied over a wide range of temperatures (from -180 degrees C to +250 degrees C) and extrapolated to 0 K.