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Matrix-Isolation and Ab Initio Study of the HKrC1…HCl Complex

机译:HKrC1…HCl配合物的基质分离和从头算研究

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摘要

The HKrCI complex with HCI is characterized by IR spectroscopy in a Kr matrix and by ab initio calculations.The HIOCI...HCI complex exhibits a strong blue shift of the H—Kr stretching mode in comparison with theHKrCI monomer, which indicates stabilization of the H—Kr bond upon complexation. The obtained maximalshift of ca. +300 cm-1 is probably the largest blue shift experimentally observed for 1:1 molecular complexes.The HCI absorptions are found to be strongly red-shifted upon complexation with HKrCI (up to ca. —500cm-'). In the HKrCI synthesis procedure, an HCUIO: matrix was first photolyzed at 193 nm to yield H andCI atoms in a Kr matrix and then annealed at about 30 K to activate mobility of H atoms and to promote theH + Kr + CI reaction. The HKrCI ... HCI complex is mainly formed from the CI ... HCI intermediate complexthat is produced by photolysis of HCI dimers. Bands of the HKrCI ... (HCI)2 complex are tentatively identifiedwith a very large shift of ca. +700 cm' for the H—Kr stretching mode. These experimental observations aresupported and explained by ab initio calculations.
机译:具有HCI的HKrCI配合物的特征在于,在Kr基质中进行红外光谱测定和从头算计算。与HKrCI单体相比,HIOCI ... HCI配合物表现出H-Kr拉伸模式的强烈蓝移,表明其稳定。络合时的H-Kr键。所获得的最大位移约为。 +300 cm-1可能是实验上对1:1分子复合物观察到的最大蓝移。发现与HKrCI络合时,HCl的吸收会发生强烈的红移(最多约-500cm-)。在HKrCI合成过程中,首先在193 nm处光解HCUIO:基质,以在Kr基质中产生H和CI原子,然后在约30 K退火以激活H原子的迁移率并促进H + Kr + CI反应。 HKrCI ... HCI络合物主要由通过HCI二聚体的光解产生的CI ... HCI中间体络合物形成。初步确定了HKrCI ...(HCI)2复合物的条带,其中ca的变化非常大。 H-Kr拉伸模式为+700 cm'。这些实验观察得到了从头算的支持和解释。

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