Chiroptical spectra of tetrakis (+)-3-heptafluorobutylrylcamphorate Ln(III) complexes with an encapsulated alkali metal ion: solution structures as revealed by chiroptical spectra.

Chiroptical spectra of tetrakis (+)-3-heptafluorobutylrylcamphorate Ln(III) complexes with an encapsulated alkali metal ion: solution structures as revealed by chiroptical spectra.
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四 ( )-3-七氟丁基樟脑酸酯 Ln(III) 与封装的碱金属离子配合物的手性光谱:手性光谱揭示的溶液结构。

DOI:
10.1002/chir.22097
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发表时间:
2012
期刊:
影响因子:
2
通讯作者:
Kaizaki,Sumio
Kaizaki,Sumio
中科院分区:
化学4区
文献类型:
--
作者:
Shirotani,Dai;Yamanari,Kazuaki;Kuroda,Reiko;Harada,Takunori;Lunkley,JamieL;Muller,Gilles;Sato,Hisako;Kaizaki,Sumio

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包封碱金属和铵离子M[Ln((+)‐hfbc)4](以下简称M‐Ln:(+)‐hfbc,(+)‐七氟丁基樟脑酸)四系((+)‐hfbc)镧系(III)配合物的制备对M、铵离子或苄铵离子以及碱金属离子进行了报道和讨论。考虑溶剂效应,研究了M-Ln配体内π−π*跃迁的电子圆二色性(CD)光谱。本文比较了固体CD、5D0←7F0(Eu(III))激发光谱、圆偏振发光和振动圆二色性对浓度、碱金属和铵离子的依赖性。研究表明,晶体中的十二面体八坐标DD‐8‐M‐Ln配合物在乙氧氢和CH3CN溶液中非对映选择性形成的方形反棱镜八坐标SAPR‐8‐M‐Ln和[Ln((+)‐hfbc)3]之间或在chcl3溶液中SAPR‐8‐M‐Ln和DD‐D2d(mm)‐8‐M‐Ln配合物之间达到平衡。所观察到的CD对偶反映了激子CD对偶,这有助于确定镧系元素(III)离子周围的四叶状SAPR (llll)绝对构型。手性学报,2012。©2012 Wiley期刊公司
The preparation of tetrakis((+)‐hfbc) lanthanide(III) complexes with an encapsulated alkali metal and ammonium ions M[Ln((+)‐hfbc)4] (hereafter abbreviated as M‐Ln : (+)‐hfbc, (+)‐heptafluorobutyrylcamphorate; M, ammonium or benzyl ammonium ions as well as alkali metal ions) was reported and discussed. The electronic circular dichroism (CD) spectra in the intraligand π−π* transition of M–Ln were examined in view of the solvent effect. Here, the concentration, alkali metal, and ammonium ion dependences are compared with the solid CD,5D0←7F0(Eu(III)) excitation spectra, circularly polarized luminescence, and vibrational circular dichroism. It has been revealed that the dodecahedral eight coordinate DD‐8‐M‐Ln complexes in crystals are equilibrated between the diastereoselectively formed square antiprism eight coordinate SAPR‐8‐M‐Ln and [Ln((+)‐hfbc)3] in EtOH and CH3CN solutions or between the SAPR‐8‐M‐Ln and DD‐D2d(mmmm)‐8‐M‐Ln complexes in CHCl3solution. The observed CD couplets are found to reflect the exciton CD couplets which are useful to determine the four‐bladed SAPR‐(llll) absolute configuration around the lanthanide(III) ion.Chirality 24:1055–1062, 2012. © 2012 Wiley Periodicals, Inc.
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