首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Neon Matrix Infrared Spectra and DFT Calculations of Tungsten Hydrides WH_x (x = 1-4, 6)
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Neon Matrix Infrared Spectra and DFT Calculations of Tungsten Hydrides WH_x (x = 1-4, 6)

机译:钨氢化物WH_x(x = 1-4,6)的霓虹灯矩阵红外光谱和DFT计算

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摘要

Laser-ablated tungsten atoms react with molecular hydrogen upon condensation in excess neon. The tungsten hydrides WH, WH_2, WH_3, WH_4, and WH_6 are identified by isotopic substitution (D_2, HD) and by density functional theory calculations of vibrational fundamentals. The WH diatomic gives a 1860.2 cm~(-1) band, WH_2 gives a strong 1831.9 cm~(-1) absorption, and WH_3 gives a sharp 1894.6 cm~(-1) peak. Absorptions due to WH_4 appear at 1920.1 and 525.2 cm~(-1), increase on annealing in solid neon, and support a tetrahedral structure. Sharp new absorptions at 2021.2, 2004.4, 1953.8, 1927.5, 1080.3, and 840.7 cm~(-1) are assigned to WH_6, based on deuterium isotopic shifts and comparison with frequencies computed by DFT for the distorted trigonal prism structure predicted earlier to be the global minimum energy structure for WH_6. The bands of WH_6 increase on annealing, decrease on broadband photolysis, and restore on further annealing. This is the first experimental identification of the WH_2, WH_4, and WH_6 hydride molecules, and WH_6 is the only known neutral metal hexahydride.
机译:激光烧蚀的钨原子在过量的氖气中缩合后与分子氢反应。氢化钨WH,WH_2,WH_3,WH_4和WH_6通过同位素取代(D_2,HD)和振动基本原理的密度泛函理论计算来识别。 WH双原子给出1860.2 cm〜(-1)谱带,WH_2吸收很强的1831.9 cm〜(-1),WH_3给出一个尖峰1894.6 cm〜(-1)。 WH_4引起的吸收出现在1920.1和525.2 cm〜(-1),在固体氖中退火时增加,并支持四面体结构。根据氘同位素位移并与DFT计算的较早预测为扭曲的三角棱镜结构的频率进行比较,将2021.2、2004.4、1953.8、1927.5、1080.3和840.7 cm〜(-1)处的急剧吸收值分配给WH_6。 WH_6的全球最小能量结构。 WH_6的带在退火时增加,在宽带光解中减少,并在进一步退火时恢复。这是WH_2,WH_4和WH_6氢化物分子的首次实验鉴定,而WH_6是唯一已知的中性六氢金属。

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