How Ions Arrange in Solution: Detailed Insight from NMR Spectroscopy of Paramagnetic Ion Pairs.

How Ions Arrange in Solution: Detailed Insight from NMR Spectroscopy of Paramagnetic Ion Pairs.
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离子在溶液中的排列方式:顺磁离子对 NMR 光谱的详细见解

DOI:
10.1002/cphc.201600804
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发表时间:
2016
期刊:
Chemphyschem : a European journal of chemical physics and physical chemistry
影响因子:
--
通讯作者:
Markus Enders
Markus Enders
中科院分区:
--
文献类型:
--
作者:
Marko Damjanović;Takaumi Morita;Yoji Horii;Keiichi Katoh;Masahiro Yamashita;Markus Enders

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顺磁性阴离子[Tb(obPc)2]-(obPc= 2,3,9,10,16,17,23,24-八丁氧基酞菁),其具有非常大的磁各向异性,具有各种抗磁性抗衡离子[P(Ph)4]+(1 a)、[As(Ph)4]+(1 B)、双通过1H、13 C、14 N和31 P NMR光谱研究了不同温度下溶液中的(三苯基膦)亚胺鎓([PPN]+,1 c)和四正丁基铵([TBA]+,1 d) 。顺磁性阴离子对反磁性阳离子的NMR光谱特性的影响允许详细了解成对离子的距离和相对取向。各向同性翻滚模型描述的季阳离子是不准确的,特别是[TBA]+与其灵活的丁基链。还评估了温度和浓度的影响。这种技术的优点是可以研究溶液中分子或离子之间相对较大的距离和取向。
Ion pairing between the paramagnetic anion [Tb(obPc)2]−(obPc=2,3,9,10,16,17,23,24‐octabutoxyphthalocyaninato), which has a very large magnetic anisotropy, with various diamagnetic counterions [P(Ph)4]+(1 a), [As(Ph)4]+(1 b), bis(triphenylphosphine)iminium ([PPN]+,1 c) and tetra‐n‐butylammonium ([TBA]+,1 d) was studied by means of1H,13C,14N, and31P NMR spectroscopy in solution at various temperatures. The influence of the paramagnetic anion on the NMR spectroscopy properties of the diamagnetic cations allowed a detailed insight into the distances and relative orientations of the paired ions. Isotropic tumbling models for the description of the quaternary cations are inaccurate, particularly for [TBA]+with its flexible butyl chains. The effects of temperature and concentration were also assessed. The advantage of this technique is that relatively large distances and the orientation between molecules or ions in solution can be studied.
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