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Quantification Studies in continuous-flow 13C Nuclear Magnetic Resonance Spectroscopy by Use of Immobilized Paramagnetic Relaxation Agents

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Fischer, H., Seiler, M., Ertl, T., Eberhardinger, U., Bertagnolli, H., Schmitt-Willich, H., et al. (2003). Quantification Studies in continuous-flow 13C Nuclear Magnetic Resonance Spectroscopy by Use of Immobilized Paramagnetic Relaxation Agents. The Journal of Physical Chemistry B, 107(20), 4879-4886. doi:10.1021/jp021631d.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-DD74-9
Abstract
Different types of immobilized free radicals as well as immobilized paramagnetic gadolinium(III) complexes were synthesized and used as relaxation agents to shorten the spin-lattice relaxation times T1 of analytes in quantitative continuous-flow 13C nuclear magnetic resonance spectroscopy (NMR). The immobilized paramagnetic relaxation agents were characterized with electron paramagnetic resonance spectroscopy (EPR) and extended X-ray absorption fine structure spectroscopy (EXAFS). With these types of paramagnetic relaxation agents, it was possible to obtain a 4-fold increase in signal-to-noise ratio per unit time, and an almost quantitative NMR spectra in continuous-flow 13C NMR spectroscopy could be acquired with this method.