Video: Vim li cas xov tooj cua zaus siv hauv NMR?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Zoo li txhua spectroscopies, NMR siv ib feem ntawm electromagnetic hluav taws xob ( xov tooj cua zaus ) los txhawb kev hloov pauv ntawm cov qib nuclear zog (Resonance). Feem ntau cov kws tshuaj siv NMR rau cov qauv kev txiav txim siab ntawm me me molecules.
Ua kom pom qhov no, NMR siv dab tsi?
Hauv NMR kev sim, photons nrog zaus hauv xov tooj cua zaus (RF) ntau yam yog siv . Hauv NMR spectroscopy, f nyob ntawm 60 thiab 800 MHz rau hydrogen nuclei. Hauv kev kho mob MRI, f feem ntau yog nruab nrab ntawm 15 thiab 80 MHz rau hydrogen imaging.
Tsis tas li ntawd, vim li cas CDCl3 siv hauv NMR? CDCl3 yog ib qho hnyav hnyav siv rau NMR tsom xam. Nws yog siv vim hais tias feem ntau cov tebchaw yuav yaj nyob rau hauv nws, nws yog volatile thiab yog li yooj yim mus tshem tawm, thiab nws yog non-reactive thiab yuav tsis pauv nws deuterium nrog protons nyob rau hauv lub molecule tau kawm.
Ib sab saum toj no, lub hom phiaj ntawm NMR yog dab tsi?
Nuclear Magnetic Resonance ( NMR ) spectroscopy yog cov txheej txheem analytical chemistry siv hauv kev tswj kom zoo thiab reserach rau kev txiav txim siab cov ntsiab lus thiab purity ntawm tus qauv nrog rau nws cov qauv molecular. Piv txwv li, NMR tuaj yeem txheeb xyuas cov khoom sib xyaw uas muaj cov khoom sib xyaw ua ke.
Hom nuclei twg uas qhia cov khoom sib nqus rau lub hom phiaj ntawm NMR spectroscopy?
Tag nrho nuclei nrog tus lej khib ntawm protons (1H, 2H, 14N, 19F, 31P) lub nuclei nrog tus lej khib ntawm neutrons (piv txwv li. 13C) ua yeeb yam tus magnetic zog xav tau rau NMR . Qhov yooj yim kev npaj ntawm ib NMR spectrometer yog tso tawm hauv qab no. Ib qho qauv (hauv ib lub khob me me) muab tso rau nruab nrab ntawm tus ncej ntawm lub zog Sib nqus.
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