13C pNMR of “crumple zone” Cu(II) isophthalate metal-organic frameworks
作者： Daniel M. Dawson , Charlotte E.F. Sansome , Lauren N. McHugh , Matthew J. McPherson , Laura J. McCormick McPherson
DOI: 10.1016/J.SSNMR.2019.05.005
关键词: Crumple zone 、 Resonance 、 Nuclear magnetic resonance spectroscopy 、 Spin–lattice relaxation 、 Paramagnetism 、 Metal-organic framework 、 Materials science 、 Spectral line 、 Crystallography
摘要: NMR spectroscopy of paramagnetic materials (pNMR) has the potential to provide great structural insight, but many challenges remain in interpreting spectra detail. This work presents a study series structurally analogous metal-organic frameworks (MOFs) based on 5-substituted isophthalate linkers and Cu(II) paddlewheel dimers, interest owing their "crumple zone" rearrangement dehydration/rehydration. 13C MAS reveal wide variation observed resonance position for chemically similar C species different MOFs but, despite this, resonances are overlapped several cases. However, by considering combination integration quantitative spectra, as function temperature T1 relaxation measurements, can be fully assigned. It is also demonstrated that prototypical MOF this series, STAM-1, displays crumple zone dehydration, well-characterised 5-ethoxyisophthalate (STAM-17-OEt) although, while have local environments, dehydrated STAM-1 exhibits less long-range order.
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