Naslov
Isotopni efekti dugoga dosega na kemijske pomake H-1 NMR u nekim derivatima benzena
(Isotope Effects on Chemical Shifts in Benzene Derivatives)

Autori
Novak, Predrag ; Vikić-Topić, Dražen ; Meić, Zlatko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
XV. Hrvatski skup kemičara i kemijskih inženjera / Gojo, M ; Trajkov, N ; Smolec, S. - Zagreb : X-press, 1997, 138-138

Skup
XV. Hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Opatija, Hrvatska, 24.03.1997. - 26.03.1997

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Sažetak
Isotope effects on NMR parameters: chemical shifts, coupling constants and relaxation times, give valuable information on molecular structure and dynamics in solution. Long range effects, i.e. those transmitted over more than three bonds from the site of the isotopic substitution, reflect averall molecular geometry and can be used in conformational studies. Deuterium-induced isotope effects in H-1 NMR spectra have rarely been observed owing to a narrow H-1 chemical shift range. We have, therefore, prepared a series of deuteriated benzene derivatives of the Ph-Z-Ph type, where Ph refers to the phenyl, while Z is the bridging group, and recorded and analysed their H-1 NMR spectra with 300 and 360 MHz NMR spectrometers. The sign, magnitude and slight nonadditivity of isotope effects on H-1 chemical shifts depend on the site of the isotopic substitution, steric and lone-pair interactions, conformation and distribution of rotamer populations.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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