Calculation of Lithium Isotope Effects in Extraction Systems with Benzo-15-crown-5 and Its Derivativesстатья
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Дата последнего поиска статьи во внешних источниках: 18 сентября 2019 г.
Аннотация:Abstract—With taking into account the β-factor value of the lithium ion aqua complex found earlier, the single
stage extraction coefficient of isotope separation (α) of the 6Li–7Li pair has been calculated for the
extraction system containing the benzo-15-crown-5–Li+ (H2O)Cl– complex in the organic phase, which
corresponds to a real extraction process. Similar calculations have been carried out for other anions, as well
as for various benzo-15-crown-5 derivatives with varying the number and type of donor atoms and different
substituents in the benzene ring. Quantum-chemical calculations of the vibrational frequencies of the isotopic
forms of the crown ether complex were performed using the Firefly program with the RHF/6-311++G**
basis set. It has been shown that the isotope separation factor in this case is lower than in the case of the anhydrous
benzo-15-crown-5–Li+Cl– complex and the model benzo-15-crown-5–Li+ (H2O) complex.