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

Marko Damjanović, Takaumi Morita, Yoji Horii, Keiichi Katoh, Masahiro Yamashita, Markus Enders

研究成果: Article査読

2 被引用数 (Scopus)

抄録

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 of 1H, 13C, 14N, and 31P 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.

本文言語English
ページ(範囲)3423-3429
ページ数7
ジャーナルChemPhysChem
17
21
DOI
出版ステータスPublished - 2016 11 4

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 物理化学および理論化学

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