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A chirped pulse Fourier transform microwave study of the refrigerant alternative 2,3,3,3-tetrafluoropropene

机译:pulse脉冲傅里叶变换微波研究制冷剂替代品2,3,3,3-四氟丙烯

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摘要

Fourier transform microwave, rotational spectra in the 6-18 GHz band of the low global warming potential, low ozone depletion potential refrigerant alternative, 2,3,3,3-tetrafluoropropene (HFO-1234yf), and in natural abundance, its three singly substituted ~(13)C isotopologues are obtained using a newly constructed chirped pulse spectrometer. Employing anharmonic vibration-rotation interaction alpha constants from ab initio calculations, the rotational constants determined for the ground vibrational state of the molecule are corrected to provide equilibrium values of these constants for all four isotopologues. The equilibrium constants are used for structure determination via both Kraitchman substitution coordinates and least squares fits to equilibrium moments of inertia. Both experiment and theory give a structure in which all but two fluorine atoms in the terminal -CF_3 group are coplanar. A substantial barrier to internal rotation of this group is predicted by ab initio calculation, and no evidence of internal rotation is seen in the spectra. A detailed description of the new spectrometer is given.
机译:傅里叶变换微波,低全球变暖潜势,低臭氧消耗潜能制冷剂替代品,2,3,3,3-四氟丙烯(HFO-1234yf)的6-18 GHz波段的旋转光谱,以及自然丰度中的三个光谱使用新构建的chi脉冲光谱仪可获得取代的〜(13)C同位素。使用从头算起的非谐振动-旋转相互作用α常数,对为分子的基态振动状态确定的旋转常数进行校正,以提供所有四个同位素的这些常数的平衡值。平衡常数用于通过Kraitchman替换坐标和最小二乘拟合到平衡惯性矩的结构确定。实验和理论均给出了其中-CF_3端基中除两个之外的所有氟原子共面的结构。通过从头算可以预测该组内部旋转的实质性障碍,并且在光谱中看不到内部旋转的迹象。给出了对新光谱仪的详细描述。

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