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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(center dot)(H_2O)_(1-4)]~+and[Mg(center dot)(H_2O)_(1-4)(center dot)Ar]~+
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Infrared Photodissociation Spectroscopy of[Mg(center dot)(H_2O)_(1-4)]~+and[Mg(center dot)(H_2O)_(1-4)(center dot)Ar]~+

机译:[Mg(中心点)(H_2O)_(1-4)]〜+和[Mg(中心点)(H_2O)_(1-4)(中心点)Ar]〜+的红外光解光谱

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Infrared photodissociation spectra of[Mg(center dot)(H_2O)_(1-4)]~+and[Mg(center dot)(H_2O)_(1-4)(center dot)Ar]~+are measured in the 3000-3800 cm~(-1)region.For[Mg(center dot(H_2O)_(1-4))~+,cluster geometries are optimized and vibrational frequencies are evaluated by density functional theory calculation.We determine cluster structures of[Mg(center dot)(H_2O)_(1-4)]~+by comparison of the infrared photodissociation spectra with infrared spectra calculated for optimized structures of[Mg(center dot)(H_2O)_(1-4)]~+.In the[Mg(center dot)(H_2O)_(1-3)]~+ions,all the water molecules are directly bonded to the Mg~+ion.The infrared photodissociation spectra of[Mg(center dot)(H_2O)_4]~+and[Mg(center dot)(H_2O)_4(center dot)Ar]~+show bands due to hydrogen-bonded OH stretching vibrations in the 3000-3450 cm~(-1)region.In the[Mg(center dot)(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(center dot)(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(中心点)(H_2O)_(1-4)]〜+和[Mg(中心点)(H_2O)_(1-4)(中心点)Ar]〜+的红外光解离光谱在3000-3800 cm〜(-1)区域。对于[Mg(中心点(H_2O)_(1-4))〜+,优化了簇的几何形状并通过密度泛函理论计算来评估振动频率。 [Mg(中心点)(H_2O)_(1-4)]〜+通过比较红外光解离光谱与为[Mg(中心点)(H_2O)_(1-4)]的优化结构计算的红外光谱进行比较+。在[Mg(中心点)(H_2O)_(1-3)]〜+离子中,所有水分子都直接键合到Mg〜+离子上。[Mg(中心点)( H_2O)_4]〜+和[Mg(中心点)(H_2O)_4(中心点)Ar]〜+在3000-3450 cm〜(-1)区域显示氢键OH伸缩振动引起的能带。 [Mg(中心点)(H_2O)_4] +离子,三个水分子附着在Mg +离子上,形成第一个溶剂化壳;结果,最稳定的[Mg(中心点)(H_2O)_4]〜+异构体具有一个由Mg〜+离子组成的六元环,其中两个在第一个溶剂化壳中有三个水分子,一个终止水分子。

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