Video: Yuav ua li cas koj pom tus naj npawb ntawm cov peaks hauv H NMR?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
VIDEO
Ua raws li qhov no hauv kev xav, dab tsi yog qhov siab tshaj hauv NMR?
A ncov ntawm kev hloov tshuaj lom neeg ntawm, hais, 2.0 txhais tau tias qhov hydrogen atoms uas ua rau ntawd ncov xav tau ib qho chaw sib nqus ob lab tsawg dua li qhov xav tau los ntawm TMS los tsim resonance. A ncov ntawm kev hloov tshuaj lom neeg ntawm 2.0 tau hais tias yog downfield ntawm TMS. Ntxiv mus rau sab laug a ncov yog, qhov downfield ntau nws yog.
Tsis tas li ntawd, muaj pes tsawg NMR signals muaj? peb
Kuj nug, NMR ntsuas dab tsi?
Nuclear Sib Nqus 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.
Kev hloov tshuaj lom neeg hauv NMR yog dab tsi?
Los ntawm Wikipedia, dawb encyclopedia. Hauv nuclear magnetic resonance ( NMR ) spectroscopy, ua tshuaj hloov pauv yog lub resonant zaus ntawm ib tug nucleus txheeb ze rau tus qauv nyob rau hauv ib tug magnetic teb. Feem ntau txoj hauj lwm thiab tus naj npawb ntawm tshuaj hloov pauv yog kuaj ntawm cov qauv ntawm ib tug molecule.
Pom zoo:
Yuav ua li cas koj nrhiav tau tus naj npawb ntawm molecules nyob rau hauv ib tug tshuaj formula?
Multiply Moles los ntawm Avogadro Constant Muab cov naj npawb ntawm moles los ntawm Avogadro tas li, 6.022 x 10^23, los xam cov lej ntawm cov molecules hauv koj cov qauv
Yuav ua li cas koj nrhiav tau tus naj npawb ntawm electrons nyob rau hauv ib tug uncharged atom?
Tus naj npawb atomic sawv cev rau tus naj npawb ntawm protons hauv atom lub nucleus. Hauv ib qho atom uas tsis tau them nyiaj, tus naj npawb ntawm cov protons ib txwm sib npaug ntawm cov electrons. Piv txwv li, carbon atoms suav nrog rau protons thiab rau electrons, yog li cov pa roj carbon monoxide yog 6
Yuav ua li cas koj nrhiav tau tus naj npawb ntawm covalent bonds nyob rau hauv ib tug compound?
Tus naj npawb ntawm daim ntawv cog lus rau ib qho atom nruab nrab yog sib npaug rau cov xov tooj ntawm cov hluav taws xob hauv lub plhaub valence tag nrho (2 los yog 8 electrons) rho tawm cov valence electrons. Txoj kev no ua haujlwm vim tias txhua daim ntawv cog lus sib cog lus uas ib qho atom tsim ntxiv lwm lub tshuab hluav taws xob rau lub atoms valence plhaub yam tsis hloov nws cov nqi
Yuav ua li cas koj thiaj nrhiav tau tus naj npawb ntawm qhov tshwm sim hauv ib qho piv txwv?
Tom qab ntawd, muab cov naj npawb ntawm qhov tshwm sim los ntawm tus lej ntawm cov yob. Txij li thaum peb tsuas yog dov ib zaug xwb, ces tus naj npawb ntawm cov txiaj ntsig tau yog 6. Cov lus teb yog qhov chaw piv txwv yog 1, 2, 3, 4, 5, 6 thiab tus lej ntawm qhov tshwm sim tau yog 6
Yuav ua li cas koj pom tus naj npawb ntawm orbitals hauv N?
Txhawm rau xam tus nqi ntawm lub orbitals los ntawm tus thawj quantum tooj, siv n2. Muaj n2 orbitals rau txhua qib zog. Rau n = 1, muaj 12 lossis ib lub orbital. Rau n = 2, muaj 22 los yog plaub orbitals