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Field Sweep Spin Decoupling of Weakly Coupled Unsymmetrical Three‐Spin System
Author(s) -
Lin WeiChuwan
Publication year - 1966
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196600011
Subject(s) - chemistry , decoupling (probability) , spectral line , spin (aerodynamics) , benzene , atomic physics , condensed matter physics , nuclear magnetic resonance , molecular physics , quantum mechanics , physics , thermodynamics , control engineering , engineering , organic chemistry
Proton magnetic resonance spectrum of 25% (volume) methyl 2,3‐dibromopropionate in benzene exhibits a typical ABC pattern in which the four strong lines from each nucleus can be immediately recognized. The assignment of spectral lines and the determination of energy‐level diagram were thus straightforward. Field‐sweep spin decoupling experiment with respect to the outer transition‐square of the sample was found to be in complete analogy with two‐spin AX system. However, spin decoupling with respect to the inner transition‐square reveals a weak satellite line on each side of the decoupled A (or C) signal. These weak satellite lines are found to be due to J AB (or J BC ) and may prove to be useful for the direct determination of J AB and J BC .