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SQSQh: 1 H‐detected SQ–SQ experiment for determination of signed silicon–carbon coupling constants
Author(s) -
Blechta Vratislav,
Schraml Jan
Publication year - 2010
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.2604
Subject(s) - chemistry , silicon , pulse sequence , benzene , carbon fibers , coupling constant , sequence (biology) , analytical chemistry (journal) , sign (mathematics) , carbon 13 , proton , coupling (piping) , nuclear magnetic resonance , organic chemistry , nuclear physics , physics , mechanical engineering , mathematical analysis , biochemistry , mathematics , particle physics , composite number , engineering , materials science , composite material
A new variant of SQ–SQ pulse sequence (SQSQh) for relative sign determination and detection of small silicon–carbon couplings over more than one bond is presented. In the SQSQh sequence, proton detection replaces carbon detection used in the original SQ–SQ pulse sequence (SQSQc). The theoretical gain in sensitivity was experimentally tested on two samples (trimethylsiloxyethane, 1, and 1,2,4‐tris(trimethylsiloxy)benzene, 2), the experimentally found gain provided by the SQSQh over the SQSQc method varied between 6 and 8. The method can be applied to linear spin systems, i.e. to systems where the silicon is coupled to the carbon in question and to any hydrogen not necessarily bonded to the carbon. Copyright © 2010 John Wiley & Sons, Ltd.