Electronic spectra of ion pairs of picrate ion withalkali-metal polyether complexes in non-aqueoussolvents

Electronic spectra of ion pairs of picrate ion withalkali-metal polyether complexes in non-aqueoussolvents
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非水溶剂中苦味酸根离子与碱金属聚醚配合物离子对的电子光谱

DOI:
10.1039/a700056a
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发表时间:
1997
期刊:
Journal of the Chemical Society, Faraday Transactions
影响因子:
--
通讯作者:
T. Komatsuzaki
T. Komatsuzaki
中科院分区:
--
文献类型:
--
作者:
K. Sawada;Fumie Chigira;K. Satoh;T. Komatsuzaki

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苦味酸根离子对的吸收光谱 聚氧乙烯单十二烷基醚的碱金属离子配合物 [C 12 H 25 (OC 2 H 4 ) n 哦,DEOn; (n=4、6和8)]和 四烷基铵离子,已在水饱和状态下测量 非极性溶剂,1,2-二氯乙烷 (1,2-DCE) 和二甲苯 (Xy)。的 最大吸收波数 (ν 最大 ) 的离子对 通过考虑解离来评估 1,2-DCE 中的 的离子对。这些值与 离子对的离子间距离的倒数,除了 水合锂配合物和 ν 最大 在 XY 中。的 ν 的值 最大 在各种非极性溶剂中 确定 DEO6-钾离子络合物的离子对。 这些值与 E 呈负相关 时间 value,即溶剂极性的参数。电子 形成离子对的苦味酸根离子的结构和离子对结构 与碱金属离子配合物的使用 ab 进行了仔细检查 初始计算。实验获得的结果和 从理论上揭示:(i)电子的变化 激发能取决于离子间距离 苦味酸根离子和离子对中的抗衡阳离子,并且 (ii) 苦味酸根离子和抗衡阳离子之间的相互作用为 主要是静电。
Absorption spectra of ion pairs of picrate ion with the alkali-metal ion complexes of poly(oxyethylene)monododecyl ethers [C 12 H 25 (OC 2 H 4 ) n OH, DEOn; (n=4, 6 and 8)] and tetraalkylammonium ions, have been measured in water-saturated non-polar solvents, 1,2-dichloroethane (1,2-DCE) and xylene (Xy). The wavenumber of absorption maxima (ν max ) of the ion pairs in 1,2-DCE was evaluated by taking into consideration the dissociation of the ion pairs. Those values show a good correlation with the reciprocal of the interionic distance of the ion pair except for the hydrated lithium complexes and with the ν max in Xy. The values of the ν max in various non-polar solvents were determined for the ion pair of the DEO6–potassium ion complex. These values were inversely correlated with the E T value, which is the parameter of solvent polarity. The electronic structures and ion pair structures of picrate ion forming the ion pair with alkali-metal ion complexes were scrutinized by using ab initio calculations. The results obtained experimentally and theoretically revealed: (i) that the change in the electronic excitation energy depends on the interionic distance between the picrate ion and the counter cation in the ion pair and (ii) that the interaction between the picrate ion and the counter cation is predominantly electrostatic.
离子液体作为液-液萃取介质的多功能性
DOI: --
发表时间: 2019
期刊:
影响因子: --
作者:
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