Quadrupole collapse of spin multiplets in the nuclear magnetic resonance of protons bonded to10B

Autor:	Masaji Kubo, Tetsushi Totani, Masako Ohtsuru, Haruyuki Watanabe
Rok vydání:	1968
Předmět:	Chemistry Biophysics chemistry.chemical_element Condensed Matter Physics Spectral line chemistry.chemical_compound Nuclear magnetic resonance Lithium borohydride Quadrupole Molecular motion Physical and Theoretical Chemistry Atomic physics Boron Molecular Biology Multiplet
Zdroj:	Molecular Physics. 14:367-372
ISSN:	1362-3028 0026-8976
DOI:	10.1080/00268976800100441
Popis:	The collapse of multiplet structures in the nuclear magnetic resonance spectra of protons bonded to boron was investigated using various boron compounds enriched or not enriched with 10B. The extent of collapse increases with increasing field gradient at the boron nuclei in the order of lithium borohydride (sp 3), trimethylaminoborane (sp 3), and n-tri(methyl-d3)-borazine (sp 2) (effect of field gradient). The collapse is stronger for 10BH signals than for 11BH signals, because the quadrupole moment of 10B is greater than that of 11B (effect of the quadrupole moment). With increasing temperature, the collapse decreases because the correlation time of molecular motion decreases (effect of the correlation time of quadrupole perturbation). Various typical line contours for the 10BH septet (a well resolved and equally spaced septet having the highest outermost peaks and the lowest second outermost peaks, a group of poorly resolved seven lines having maxima at both ends of the septet, and a broad flat-topped a...
Databáze:	OpenAIRE
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