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Relative Signs of 29Si-13C Couplings
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SYSNO ASEP 0309022 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Relative Signs of 29Si-13C Couplings Title Relativni znaménka 29Si-13C couplingu Author(s) Blechta, Vratislav (UCHP-M) RID, ORCID, SAI
Schraml, Jan (UCHP-M) RID, ORCID, SAISource Title Magnetic Resonance in Chemistry. - : Wiley - ISSN 0749-1581
Roč. 46, č. 8 (2008), s. 734-738Number of pages 5 s. Language eng - English Country GB - United Kingdom Keywords nmr ; nj(si,c) ; ghmqc-relay Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GA203/06/0738 GA ČR - Czech Science Foundation (CSF) IAA400720706 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40720504 - UCHP-M (2005-2011) UT WOS 000257727200006 DOI https://doi.org/10.1002/mrc.2241 Annotation Two pulse sequences applicable to the determination of relative signs of coupling constants, gHSQC RELAY(P) and gHSQC RELAY(D), were developed and tested. These sequences are suitable for determination of relative signs of long-range coupling constants between two heteronuclei of low abundance (such as 29Si and 13C) and are applicable even to cases in which one of the heteronuclei (29Si) does not exhibit coupling with some of the detected protons (1H). The two sequences differ in the manner in which they suppress undesirable homonuclear coherence transfers. Each of the sequences can be combined with an isotope filter for better suppression of the centerlines arising from more abundant, NMR-inactive isotopes. The sequences were tested on ethoxytrimethylsilane and (E)-(buta-1,3-dienyloxy)trimethylsilane, and we conclude that 2J(29Si O 13C) is positive while 3J(29Si O C 13C) is negative in both compounds. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2009
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