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首页> 外文期刊>The Journal of Chemical Physics >ON THE ETHENE/HCL VAN DER WAALS COMPLEXES OBSERVED IN LIQUEFIED ARGON AND LIQUEFIED NITROGEN
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ON THE ETHENE/HCL VAN DER WAALS COMPLEXES OBSERVED IN LIQUEFIED ARGON AND LIQUEFIED NITROGEN

机译:液化氩和液化氮中观察到的乙烯/ HCL范德华络合物

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The mid-infrared (4000-400 cm(-1)) and far-infrared (300-10 cm(-1)) spectra of C2H4/HCl mixtures dissolved in liquefied argon (93-125 K) and in liquefied nitrogen (80-118 K) are discussed. In all spectra, experimental evidence was found for the existence of 1:1 and 1:2 Van der Waals complexes. Using spectra recorded at different temperatures, the complexation enthalpy Delta dH degrees for the 1:1 complex was determined to be -87(2) kJ mol(-1) in liquid argon and -6.4(4) kJ mol(-1) ill liquid nitrogen, while for the 1:2 complex a Delta H degrees of -18.3(6) kJ mol(-1) was found. For all species studied, the vibrational frequencies were obtained from ab initio calculations at the MP2/6-311+G** level. Using the SCRF/SCIPCM scheme to correct for the solvent influences. and using statistical thermodynamics to account for the zero-point vibrational and thermal contributions, approximate values for the dissociation energy were calculated from the complexation enthalpies, The resulting values, -12.7(5) kJ mol(-1) for the 1:1 complex and -26.9(2) kJ mol(-1) for tile 1:2 complex are compared with the nb initio values. The transition dipole moment of the nu(2) ethene mode induced in the 1:1 complex is determined to be 0.13 D Angstrom(-1). A multipole analysis shows that the main contribution is due to the quadrupole moment of the HCl moiety, closely followed by that due to the dipole moment, with much smaller contributions due to higher multipoles, In the 1:1 complex, the HCl stretching intensity is enhanced by a factor of 7.7 in comparison with the monomer. This increase is interpreted in the equilibrium charge-charge flux model using nit initio atomic polar tensors. (C) 1997 American Institute of Physics. [References: 77]
机译:溶解在液化氩气(93-125 K)和液化氮气(80)中的C2H4 / HCl混合物的中红外光谱(4000-400 cm(-1))和远红外光谱(300-10 cm(-1)) -118 K)进行了讨论。在所有光谱中,都发现存在1:1和1:2 Van der Waals配合物的实验证据。使用在不同温度下记录的光谱,在液态氩中1:1配合物的络合焓Delta dH度被确定为-87(2)kJ mol(-1),在-6.4(4)kJ mol(-1)下液氮,而对于1:2的配合物,发现Delta H度为-18.3(6)kJ mol(-1)。对于所有研究的物种,振动频率是从头算得到的,在MP2 / 6-311 + G **水平上获得。使用SCRF / SCIPCM方案纠正溶剂影响。并使用统计热力学来解释零点振动和热贡献,从络合焓计算离解能的近似值,对于1:1络合物,所得值为-12.7(5)kJ mol(-1)和-26.9(2)kJ mol(-1)对于图块1:2配合物与nb初始值进行比较。确定在1:1配合物中诱导的nu(2)乙烯模式的跃迁偶极矩为0.13 D埃(-1)。多极分析表明,主要贡献是由于HCl部分的四极矩,紧随其后的是由于偶极矩,由于较高的多极,其贡献小得多。在1:1配合物中,HCl的拉伸强度为与单体相比提高了7.7倍。这种增加在使用初始电荷原子极性张量的平衡电荷-电荷通量模型中得到解释。 (C)1997美国物理研究所。 [参考:77]

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