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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.2779
|2 doi
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|a pubmed24n0700.xml
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|b ger
|c DE-627
|e rakwb
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|a eng
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|a Kurfürst, Milan
|e verfasserin
|4 aut
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|a Geminal (2)J((29)Si-O-(29)Si) couplings in oligosiloxanes and their relation to direct (1)J((29) Si-(13)C) couplings
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 21.05.2015
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|a Date Revised 03.11.2014
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Copyright © 2011 John Wiley & Sons, Ltd.
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|a Absolute values of (79) geminal (2)J((29) Si-O-(29)Si) couplings were measured in an extensive series of (55) unstrained siloxanes dissolved in chloroform-d. Signs of (2)J((29)Si-O-(29)Si) in some (9) silicon hydrides were determined relative to (1)J((29)Si-(1)H) which are known to be negative. It is supposed that positive sign of the (2)J((29)Si-O-(29)Si) coupling found in all studied hydrides is common to all siloxanes. Theoretical calculations for simple model compounds failed to reproduce this sign and so their predictions of bond length and angle dependences cannot be taken as reliable. Useful empirical correlations were found between the (2)J((29)Si-O-(29)Si) couplings on one side and the total number m of oxygen atoms bonded to the silicon atoms, sum of (29)Si chemical shifts or product of (1)J((29)Si-(13)C) couplings on the other side. The significance of these correlations is briefly discussed
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|a Journal Article
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|a 13C NMR
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|a 1J(29Si-13C)
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|a 29Si NMR
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|a 29Si chemical shifts
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|a 29Si couplings
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|a 2J(29Si-O-29Si)
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|a INADEQUATE
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|a empirical correlations
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|a Blechta, Vratislav
|e verfasserin
|4 aut
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|a Schraml, Jan
|e verfasserin
|4 aut
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|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g 49(2011), 8 vom: 15. Aug., Seite 492-501
|w (DE-627)NLM098179667
|x 1097-458X
|7 nnns
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| 773 |
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|g volume:49
|g year:2011
|g number:8
|g day:15
|g month:08
|g pages:492-501
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|u http://dx.doi.org/10.1002/mrc.2779
|3 Volltext
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|d 49
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