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Probing intramolecular interactions in arylselenides using a property descriptor based approach

机译:使用基于性能描述符的方法探测芳基硒化物中的分子内相互作用

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Although a large volume of experimental evidence is available on the existence of intramolecular nonbonding interactions between chalcogen atoms in main group organometallic compounds, the primary focus has been on the contact distances involving the chalcogen atoms. The important class of intramolecular Se center dot center dot center dot X (where X is O, S, N) nonbonding interaction in a series of organoselenium compounds is quantified using a new scheme based on a molecular property descriptor. In the present study, we have employed the nucleus-independent chemical shift [NICS(0)] values, as a property descriptor to evaluate the strength of exocyclic nonbonding interactions in a series of aryl selenides. The ab initio MP2 as well as density functional theory methods have been used in conjunction with Dunning's cc-pVDZ basis set. The quantified values of Se center dot center dot center dot X nonbonding interactions are compared with other schemes based on thermochemical equations such as homodesmic and ortho-para methods. The changes in NICS(O) values at the aryl ring center are found to be sensitive to the strength of exocyclic Se center dot center dot center dot X interaction.
机译:尽管有大量的实验证据表明主族有机金属化合物中硫族元素原子之间存在分子内非键相互作用,但主要关注点是涉及硫族元素原子的接触距离。使用基于分子性质描述符的新方案,对一系列有机硒化合物中的重要分子内Se中心点中心点中心点X(其中X为O,S,N)非键相​​互作用进行了定量。在本研究中,我们采用了独立于核的化学位移[NICS(0)]值作为属性描述符来评估一系列芳基硒化物中环外非键相互作用的强度。从头开始的MP2以及密度泛函理论方法已与Dunning的cc-pVDZ基础集结合使用。 Se中心点中心点中心点X非键相互作用的定量值与基于热化学方程式的其他方案(例如同位和邻位对位方法)进行比较。发现芳基环中心的NICS(O)值变化对环外Se中心点中心点中心点中心点X相互作用的强度敏感。

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