Bromine (Br) has two NMR active nuclei, 79 Br and 81 Br with a wide chemical shift range (fig. 1). Both nuclei are quadrupolar and therefore yield broad signals as ions in symmetrical environments and signals, too broad to be observed with a high-resolution NMR spectrometer, even in small molecules.

Solid-state bromine NMR references Pinhui Chen, Brice J. Albert, Chukun Gao, Nicholas Alaniva, Lauren E. Price, Faith J. Scott, Edward P. Saliba, Erika L. Sesti, Patrick T. Judge, Edward W. Fisher, and Alexander B. Barnes

An aqueous solution of 0.01M NaBr is used as an external standard reference. The absolute frequencies are 25.053980 MHz for 79 Br and 27.006518 MHz for 81 Br with respect to 100.00 MHz of the TMS signal. Also see IUPAC recommendations for reporting the NMR chemical shits of all nuclei relative to the 1 H resonance of TMS (02JMR323-156).

Nuclear magnetic properties of the NMR active Nuclide 79 Br. Nuclear isomers or excited states with the activation energy in keV related to the ground state. The following table shows the …

1990年1月1日 · Pure and mixed silver halide crystals form the basis of chemical photography. We have used 79 Br solid state NMR at 4.7 T to characterize the structure and dynamics of defects and surface effects that may be involved in determining the photographic properties of …

2011年1月1日 · Much like chlorine, both of the major isotopes of bromine, 79 Br and 81 Br, may be used for NMR experiments. The sensitivity for the 81 Br nucleus is slightly better, and a smaller quadrupole moment leads to reduced linewidth; however, 79 Br is more commonly used.

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2010年2月11日 · Our results indicate that ionic bromide systems should be generally accessible to characterization by (79/81)Br SSNMR despite sizable quadrupolar interactions. The resolving capabilities of (79/81)Br SSNMR spectroscopy are illustrated, using samples which possess up to four magnetically inequivalent sites, and through a rare example of (79)Br ...

(79)Br NMR spectroscopy has been used to monitor a series of reactions in which the bromide ion is produced, including the Menschutkin reaction of pyridine with a range of substituted benzyl bromides and a Heck coupling process.

2009年2月2日 · 79 Br NMR spectroscopy has been used to monitor a series of reactions in which the bromide ion is produced, including the Menschutkin reaction of pyridine with a range of substituted benzyl bromides and a Heck coupling process.