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231223s2004 xx ||||| 00| ||eng c |
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|a pubmed24n0489.xml
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|a (DE-627)NLM146740580
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|a (NLM)14971015
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Gschwind, Ruth M
|e verfasserin
|4 aut
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|a Gs-HSQC-NOESY versus gs-NOESY-HSQC experiments
|b signal attenuation due to diffusion; application to symmetrical molecules
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|c 2004
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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| 500 |
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|a Date Completed 04.04.2005
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|a Date Revised 02.07.2004
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Copyright 2004 John Wiley & Sons, Ltd.
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|a Gradient-selected (gs) HSQC-NOESY type experiments are often applied in order to obtain NOE cross peaks in symmetrical molecules or in complex organic molecules, e.g. carbohydrates. Since the coherence-selecting gradients in these pulse sequences are separated by several delays, including the mixing time, the gs-HSQC-NOESY spectra exhibit severe signal attenuation due to diffusion effects. The respective NOE information unaffected by diffusion effects can be obtained by X-half-filtered gs-NOESY-HSQC spectra. In this paper, an X-half-filtered version of the gs-NOESY-HSQC experiment is presented and the NOE cross peak integrals of its spectra are compared with those of a standard gs-HSQC-NOESY experiment. With phenanthrene as an example of symmetrical molecules, it is shown that the relative signal attenuation of gs-HSQC-NOESY cross peaks versus gs-NOESY-HSQC cross peaks is caused by diffusion effects and follows the Stejskal-Tanner equation. In contrast, the X-half-filtered gs-NOESY-HSQC experiment provides NOE cross peaks with reasonable signal-to-noise ratios even for long-range interactions in the presence of quadrupolar relaxation. This is demonstrated by the spectra of lithium dimethylcuprate
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|a Journal Article
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1 |
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|a Xie, Xiulan
|e verfasserin
|4 aut
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|a Rajamohanan, Pattuparambil R
|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 42(2004), 3 vom: 27. März, Seite 308-12
|w (DE-627)NLM098179667
|x 1097-458X
|7 nnns
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| 773 |
1 |
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|g volume:42
|g year:2004
|g number:3
|g day:27
|g month:03
|g pages:308-12
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|a GBV_USEFLAG_A
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|a SYSFLAG_A
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|a GBV_NLM
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|a GBV_ILN_350
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|a AR
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|d 42
|j 2004
|e 3
|b 27
|c 03
|h 308-12
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