How ions arrange in solution

• Verfasst von: Damjanović, Marko [VerfasserIn]
• Verfasst von: Morita, Takaumi [VerfasserIn]
• Verfasst von: Horii, Yoji [VerfasserIn]
• Verfasst von: Katoh, Keiichi [VerfasserIn]
• Verfasst von: Yamashita, Masahiro [VerfasserIn]
• Verfasst von: Enders, Markus [VerfasserIn]
• Titel: How ions arrange in solution
• Titelzusatz: detailed insight from NMR spectroscopy of paramagnetic ion pairs
• Verf.angabe: Marko Damjanović, Takaumi Morita, Yoji Horii, Keiichi Katoh, Masahiro Yamashita, Markus Enders
• E-Jahr: 2016
• Jahr: 1 September 2016
• Umfang: 7 S.
• Fussnoten: Gesehen am 06.05.2020
• Titel Quelle: Enthalten in: ChemPhysChem
• Ort Quelle: Weinheim : Wiley-VCH Verl., 2000
• Jahr Quelle: 2016
• Band/Heft Quelle: 17(2016), 21, Seite 3423-3429
• ISSN Quelle: 1439-7641
• DOI: doi:10.1002/cphc.201600804
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: ion pairs
• Sach-SW: magnetic anisotropy
• Sach-SW: magnetic properties
• Sach-SW: NMR spectroscopy
• Sach-SW: pseudo-contact shifts
• K10plus-PPN: 1697294707

Abstract

Abstract 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.