Yes, qhov tsis zoo 1H NMR hloov pauv tau tshwm sim, piv txwv li sab hauv Nitrogen-bound Protons ntawm porphyrins feem ntau muaj cov tshuaj tsis zoo (xws li ntawm -1.5 - -4.5 ppm) vim kom muaj zog tiv thaiv cov nyhuv ntawm macrocyclic aromatic nplhaib tam sim no ntawm Protons hauv macrocycle (as opposed to Protons sab nraum macrocycle …
Koj puas tuaj yeem muaj PPM tsis zoo?
NMR yog raws li quantum physics thiab nws tsis tuaj yeem tau txais qhov tsis zoo ntawm qhov concentration.
Yuav ua li cas carbon yog downfield?
The 13C-NMR teeb liab rau carbonyl carbons feem ntau yog qhov chaw deb tshaj plaws (170-220 ppm), vim yog ob qho tib si sp 2 hybridization thiab rau ob daim ntawv cog lus rau oxygen.
PPM siab dua txhais li cas NMR?
Kab rov tav nplai yog qhia raws li (ppm). yog hu ua cov tshuaj hloov pauv thiab ntsuas hauv feem ntawm ib lab - ppmLub ncov ntawm kev hloov tshuaj lom neeg ntawm, hais tias, 2.0 txhais tau hais tias cov hydrogen atoms uas ua rau lub ncov xav tau magnetic teb ob labths. tsawg dua li qhov xav tau los ntawm TMS los tsim cov suab nrov.
Yog Deshielded upfield los yog downfield?
Nws yog qhov yooj yim los piav qhia txog cov haujlwm txheeb ze ntawm cov resonances hauv NMR spectrum. Piv txwv li, lub ncov ntawm kev hloov tshuaj lom neeg, δ, ntawm 10 ppm yog hais tias yog downfield lossis deshielded nrog kev hwm rau lub ncov ntawm 5 ppm, lossis yog tias koj xav tau, lub ncov ntawm 5 ppm yog upfield lossis shielded nrog kev hwm rau lub ncov ntawm 10 ppm.
