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231223s2009 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.2505
|2 doi
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|a pubmed25n0637.xml
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|a eng
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|a Blechta, Vratislav
|e verfasserin
|4 aut
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|a SQ-SQ experiment for determination of relative signs of small nJ(29Si,13C) couplings in a wide variety of silicon compounds
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|c 2009
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 23.02.2010
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|a Date Revised 12.11.2009
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Copyright 2009 John Wiley & Sons, Ltd.
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|a A modification of double quantum-zero quantum (DQ-ZQ) experiment termed single-quantum-single-quantum (SQ-SQ) experiment is proposed for the determination of relative signs and magnitudes of coupling constants. The modification replaces the multiple-quantum evolution period by two synchronously incremented single-quantum periods. Similarly to DQ-ZQ experiment, the sequence requires only two coupling constants that share one nucleus, the one to be measured and a reference one. This allows application to a larger variety of molecular fragments than traditional 2D sequences producing E.COSY or TROSY pattern. The SQ-SQ experiment eliminates the effects of some other couplings during t1, thereby simplifying the 2D pattern and increasing the signal intensity in comparison with DQ-ZQ experiment. The presented sequence is particularly designed for the determination of silicon-carbon coupling constants across several bonds at natural abundance using silicon-hydrogen couplings as the sign reference. The signs of silicon-carbon couplings across two and three bonds in dimethyl(phenoxy)silane which cannot be detected by traditional methods and which have not yet been determined are established by the SQ-SQ method here: 2J(Si,C) = +2.2 Hz and 3J(Si,C) = -1.7 Hz
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|a Journal Article
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|a Schraml, Jan
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g 47(2009), 12 vom: 26. Dez., Seite 1019-23
|w (DE-627)NLM098179667
|x 1097-458X
|7 nnns
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| 773 |
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|g volume:47
|g year:2009
|g number:12
|g day:26
|g month:12
|g pages:1019-23
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|u http://dx.doi.org/10.1002/mrc.2505
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