Far-infrared spectra and ab initio calculations of nitrosyl chloride
摘要:
The far-infrared spectra of (ON35Cl)-Cl-35 and (ON37Cl)-Cl-37 were recorded from 20 to 100 cm-1 at a resolution of 0.004 cm-1. Thirteen pure rotational Q branches were assigned for each molecule in the ground vibrational state from which the rotational constants A and the distortion constants DELTA-K and phi-K were obtained utilizing previously reported values of the constants B and C from microwave studies. Rotational Q branches were also observed for both molecules in two vibrationally excited states. Ab initio calculations up to those using fourth-order perturbation (MP4) with configuration interaction utilizing the 6-31G* basis set were carried out. Optimized geometries obtained at this level are compared with those obtained with smaller basis sets without configuration interaction and with the experimentally determined values. Force constants were calculated which are compared with the values previously reported. The potential energy distributions and quartic distortion constants were obtained at all levels of ab initio calculations up to MP2/6-31G*.
Schwingungsspektren und Normalkoordinatenanalysen der92Mo-,100Mo-,35Cl- und37Cl-Isotopomeren der Clusteranionen [(Mo6X8i)Y6a]2?; Xi = Cl, Br; Ya = F, Cl, Br, I
摘要:
AbstractDie Tetrabutylammonium (TBA)‐Salze der Octa‐μ3‐halogeno‐hexahalogeno‐octahedro‐hexamolybdat(2 –)‐Anionen [(Mo6X8i)Y]2−; Xi = Cl, Br; Ya = F, Cl, Br, I; sind unter Verwendung von 92Mo, 100Mo, 35Cl und 37Cl dargestellt worden. Die 10 K IR‐ und Raman‐Spektren zeigen signifikante Frequenzverschiebungen als Folge der Isotopenmarkierung des Mo6‐Käfigs bzw. der inneren X8i oder der äußeren Koordinationssphäre Y. Die Normalkoordinatenanalyse ergibt (MoMo)‐Valenzkraftkonstanten im Bereich von 1.3 bis 1.5 mdyn/Å. Für die μ3‐gebundenen Halogene Cli und Bri werden Valenzkraftkonstanten von 1.1 bzw. 1.0 mdyn/Å berechnet. Die Werte für die (MoYa)‐Bindungen liegen im üblichen Halogenbereich. Die beobachteten Isotopenshifts werden durch die Rechnungen sehr gut verifiziert, so daß erstmals eine detaillierte Zuordnung der IR‐ und Raman‐Spektren dieser Verbindungsreihe vorgenommen werden kann.
摘要 CH 2 F 37 Cl(95% 同位素纯样品)的二极管激光光谱已记录在以 ν 4 基波为特征的 9.4 μm 区域。光谱分析允许分配超过 3700 个跃迁,其中 J ≤ 92 和 K a ≤ 16 的预期 a / b 杂化结构。原点在 1067.7140 cm -1 的 ν 4 基波主要通过 a - 和 b 型科里奥利耦合与位于 1002 cm -1 附近较低波数的 ν 9 基波相互作用。对于 K a ′ = 14 能级,已经观察到由费米共振与 ν 5 + ν 6 产生的局部效应。通过将较少扰动的跃迁拟合到 I r 表示中的 Watson 的 A 归约哈密顿量来确定一组有效的上能态分子常数。由于二阶 a 型科里奥利共振,在避免的交叉点附近观察到并分配了许多允许扰动的 ν 9 跃迁。使用合适的程序,我们经历了两带系统分析,该分析产生了 v 4 = 1 和 v 9 = 1 状态的分子常数以及相互作用参数。从
Study of isotope effects in the ground state of the symmetrical isotopomers of CuCl2
作者:P. Crozet、J.C. Coste、R. Bacis、A.J. Bouvier、S. Churassy、A.J. Ross
DOI:10.1016/0301-0104(93)85088-p
日期:1993.12
Investigations of the ground state of CuCl2 have been pursued, recording laser induced fluorescence spectra on a Bomem DA3 Fourier transform spectrometer in the range 10000-16500 cm(-1). A single mode ring dye laser, set in the red (615-665 nm), excited the (IIu)-I-2-(X) over tilde(2)II(g) electronic transition in copper dichloride vapour. Analysis of spectra recorded from isotopically enriched samples of CuCl2 allowed us to check our assignment of vibrational stretching quantum numbers nu(1)(less than or equal to 7) and nu(3)(less than or equal to 8) in the ground state. A normal mode model including isotope effects has been used to fit data from all four symmetrical isotopomers of copper dichloride. The rms deviation of the fit containing about 4000 lines is 0.040 cm(-1). From this model, we find an equilibrium Cu-Cl bond length of 0.203335(5) nm and force constant k(1) =277.28(1) N m(-1).
Far-infrared spectra and ab initio calculations of nitrosyl chloride
作者:J.R. Durig、T.J. Geyer、Young Hae Kim、V.F. Kalasinsky、J.K. McDonald
DOI:10.1016/0022-2860(91)80151-s
日期:1991.4
The far-infrared spectra of (ON35Cl)-Cl-35 and (ON37Cl)-Cl-37 were recorded from 20 to 100 cm-1 at a resolution of 0.004 cm-1. Thirteen pure rotational Q branches were assigned for each molecule in the ground vibrational state from which the rotational constants A and the distortion constants DELTA-K and phi-K were obtained utilizing previously reported values of the constants B and C from microwave studies. Rotational Q branches were also observed for both molecules in two vibrationally excited states. Ab initio calculations up to those using fourth-order perturbation (MP4) with configuration interaction utilizing the 6-31G* basis set were carried out. Optimized geometries obtained at this level are compared with those obtained with smaller basis sets without configuration interaction and with the experimentally determined values. Force constants were calculated which are compared with the values previously reported. The potential energy distributions and quartic distortion constants were obtained at all levels of ab initio calculations up to MP2/6-31G*.
Schwingungsspektren und Normalkoordinatenanalysen der92Mo-,100Mo-,35Cl- und37Cl-Isotopomeren der Clusteranionen [(Mo6X8i)Y6a]2?; Xi = Cl, Br; Ya = F, Cl, Br, I
作者:D. Bublitz、W. Preetz
DOI:10.1002/zaac.19966220702
日期:1996.7
AbstractDie Tetrabutylammonium (TBA)‐Salze der Octa‐μ3‐halogeno‐hexahalogeno‐octahedro‐hexamolybdat(2 –)‐Anionen [(Mo6X8i)Y]2−; Xi = Cl, Br; Ya = F, Cl, Br, I; sind unter Verwendung von 92Mo, 100Mo, 35Cl und 37Cl dargestellt worden. Die 10 K IR‐ und Raman‐Spektren zeigen signifikante Frequenzverschiebungen als Folge der Isotopenmarkierung des Mo6‐Käfigs bzw. der inneren X8i oder der äußeren Koordinationssphäre Y. Die Normalkoordinatenanalyse ergibt (MoMo)‐Valenzkraftkonstanten im Bereich von 1.3 bis 1.5 mdyn/Å. Für die μ3‐gebundenen Halogene Cli und Bri werden Valenzkraftkonstanten von 1.1 bzw. 1.0 mdyn/Å berechnet. Die Werte für die (MoYa)‐Bindungen liegen im üblichen Halogenbereich. Die beobachteten Isotopenshifts werden durch die Rechnungen sehr gut verifiziert, so daß erstmals eine detaillierte Zuordnung der IR‐ und Raman‐Spektren dieser Verbindungsreihe vorgenommen werden kann.