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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Infrared Photodissociation Spectroscopy of [Mg·(H_2O)_(1-4)]~+ and [Mg·(H_2O)_(1-4)·Ar]~+
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Infrared Photodissociation Spectroscopy of [Mg·(H_2O)_(1-4)]~+ and [Mg·(H_2O)_(1-4)·Ar]~+

机译:[Mg·(H_2O)_(1-4)]〜+和[Mg·(H_2O)_(1-4)·Ar]〜+的红外光解离光谱

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摘要

Infrared photodissociation spectra of [Mg·(H_2O)_(1-4)]~+ and [Mg·(H_2O)_(1-4)·Ar]~+ are measured in the 3000-3800 cm~(-1) region. For [Mg·(H_2O)_(1-4)]~+, cluster geometries are optimized and vibrational frequencies are evaluated by density functional theory calculation. We determine cluster structures of [Mg·(H_2O)_(1-4)]~+ by comparison of the infrared photodissociation spectra with infrared spectra calculated for optimized structures of [Mg·(H_2O)_(1-4)]~+. In the [Mg·(H_2O)_(1-3)]~+ ions, all the water molecules are directly bonded to the Mg~+ ion. The infrared photodissociation spectra of [Mg·(H_2O)_4]~+ and [Mg·(H_2O)_4·Ar]~+ show bands due to hydrogen-bonded OH stretching vibrations in the 3000-3450 cm~(-1) region. In the [Mg·(H_2O)_4]~+ ion, three water molecules are attached to the Mg~+ ion, forming the first solvation shell; the fourth molecule is bonded to the first solvation shell. As a result, the most stable isomer of [Mg·(H_2O)_4]~+ has a six-membered ring composed of the Mg~+ ion, two of the three water molecules in the first solvation shell, and a termination water molecule.
机译:[Mg·(H_2O)_(1-4)]〜+和[Mg·(H_2O)_(1-4)·Ar]〜+的红外光解离光谱在3000-3800 cm〜(-1)下测量地区。对于[Mg·(H_2O)_(1-4)]〜+,通过密度泛函理论计算,优化了簇的几何形状并评估了振动频率。通过比较红外光解离光谱与为优化结构的[Mg·(H_2O)_(1-4)]〜+计算的红外光谱,我们确定了[Mg·(H_2O)_(1-4)]〜+的簇结构。 。在[Mg·(H_2O)_(1-3)]〜+离子中,所有水分子都直接与Mg〜+离子键合。 [Mg·(H_2O)_4]〜+和[Mg·(H_2O)_4·Ar]〜+的红外光解离光谱显示在3000-3450 cm〜(-1)区域氢键的OH拉伸振动引起的能带。 。在[Mg·(H_2O)_4]〜+离子中,三个水分子附着在Mg〜+离子上,形成第一溶剂化壳。第四分子键合至第一溶剂化壳。结果,最稳定的[Mg·(H_2O)_4]〜+异构体具有由Mg〜+离子,第一个溶剂化壳中的三个水分子中的两个和终止水分子组成的六元环。

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