Beryllium(II) complexes with (R2N)2P(O)F (R=Me or Et): Synthesis and characterisation by multinuclear (31P, 19F and 9Be) NMR in solution

Sanhoury, M. A. K.; Dhia, M. T. Ben; Nsangou, Mama; Khaddar, M. R.

doi:10.1016/j.poly.2005.09.015

Cited by 4 publications

References 30 publications

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SolutionNMRof the Light Main Group Metals

Hanusa

2015

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Metal‐centered NMR spectroscopy in solution has long been an important complement to the nonmetal nuclei (e.g., 1 H, 13 C, and 31 P) routinely used in the NMR characterization of organic, organometallic, and coordination compounds. The chemical shifts of metal nuclei can be sensitive to small changes in molecular geometry and coordination number, revealing subtle differences in the solution composition of complexes, and can be used to study interchange mechanisms. This article is intended as an overview of the characteristics of the NMR‐active nuclei of the seven lightest metals as measured in solution, and as studied with computational methods. All of these elements (Li, Be, Na, Mg, Al, K, and Ca) possess one or more isotopes with nuclear spins that are potentially observable with solution NMR (nuclear magnetic resonance) techniques. They all possess quadrupole moments, and their resonances are often broad in asymmetric environments. Apart from those characteristics, they constitute a varied group, with their relative receptivity (a measure of their ease of observation) varying by a factor of over 400 000 to 1. Issues of detection and characteristic chemical shift ranges are discussed, with the aim of assisting the experimentalist in deciding whether metal‐based NMR will be useful in characterizing a system of concern and what information is likely to be obtained. An emphasis is placed on spectra obtained in nonaqueous solutions; in such media, ion‐pairing effects are the greatest, and it is where the species with the largest chemical shifts are typically found. Reviews on individual nuclei are cited where available.

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