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:
影响因子:
--
通讯作者:
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
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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