29Si-13C Spin-Spin Couplings over Si-O-Carom Link
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F06%3A00054948" target="_blank" >RIV/67985858:_____/06:00054948 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
29Si-13C Spin-Spin Couplings over Si-O-Carom Link
Original language description
29Si-13C couplings were measured in para substituted silylated phenols, X-C6H4-O-SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). The SiR1R2R3 silyl groups included trimethylsilyl (Si(CH3)3, TMS), tert-butyldimethylsilyl (Si(CH3)2C(CH3)3, TBDMS), dimethylsilyl (SiH(CH3)2, DMS), and tert-butyldiphenylsilyl (Si(C6H5)2C(CH3)3, TBDPS). Previously developed (Si,C,Si)gHMQC methods and narrow 29Si lines allowed determination of coupling constants over up to five bonds. The measurable couplings depend on the nature of the substituents on the silicon. The two- and three-bond couplings are not affected by ring substitution in the para position. These properties render the 29Si-13C couplings suitable for line assignment in the spectra of silylated polyphenols. The calculations show that the 2-bond and 3-bond couplings, which are of a similar magnitude, are of opposite sign. The four- and five-bond couplings are affected by the substituent X in a not trivial manner.
Czech name
29Si-13C Spin-spinové interakce přes Si-O-carom spojení
Czech description
29Si-13C interakce byly změřeny v para substituovaných silylovaných fenolech, X-C6H4-O-SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). Jako SiR1R2R3 silyl byly použity trimethylsilyl (Si(CH3)3, TMS), tert-butyldimethylsilyl (Si(CH3)2C(CH3)3, TBDMS), dimethylsilyl (SiH(CH3)2, DMS) a tert-butyldiphenylsilyl (Si(C6H5)2C(CH3)3, TBDPS). Hodnoty interakcí závisí na substituentech na křemíku. Interakce přes dvě a tři vazby nazávisí na substituentech benzenového jádra. Interakce přes 4 a více vazeb jsou ovlivněnysubstituentem.
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2006
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Magnetic Resonance in Chemistry
ISSN
0749-1581
e-ISSN
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Volume of the periodical
44
Issue of the periodical within the volume
7
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
669-674
UT code for WoS article
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EID of the result in the Scopus database
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