Nuclear Magnetic Resonance (NMR) is based on the fact that certain nuclei exhibit a magnetic moment, oriented by a magnetic
field, and absorb characteristic frequencies in the radiofrequency part of the spectrum. The spectral lines of the nuclei
are highly influenced by the chemical environment, i.e. the structure and interaction of the molecules. NMR is now the leading
technique and a powerful tool for the investigation of the structure and interaction of molecules. The present Landolt-Boernstein
volume III/40A "Nuclear Magnetic Resonance Data, Chemical Shifts and Coupling Constants for Boron-11" appears as a supplement
volume to Landolt-Boernstein's New Series Group III, Volume 35, Subvolume A. Included in this volume are simple boranes, boron
macrocycles, dendrimers, and polymers.