2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Nyiaj deuterated cov kuab tshuaj tau ib txwm siv rau NMR spectroscopy nyob rau hauv kev txiav txim txhawm rau txhawm rau txhawm rau thiab shimming, ntxiv rau txhawm rau txhawm rau cov teeb meem loj hnyav uas yuav txwv tsis pub tshwm sim hauv proton NMR spectrum. Kev nce qib hauv kev ntsuas NMR tam sim no ua rau niaj hnub siv cov kuab tshuaj deuterated tsis tsim nyog.
Vim li cas thiaj xav tau cov kuab tshuaj deuterated hauv NMR?
Nyob rau hauv proton NMR spectroscopy, deuterated hnyav (enriched rau >99% deuterium) yuav tsum yog siv kom tsis txhob kaw lub teeb liab cuam tshuam loj lossis teeb liab los ntawm cov proton (piv txwv li, hydrogen-1)tam sim no hauv cov kuab tshuaj nws tus kheej.
Vim li cas cov kuab tshuaj deuterated siv hauv 1H NMR?
Kev piav qhia: Vim li cas 1: Kom tsis txhob swamping los ntawm cov teeb liab hnyav. … Ib qho yooj yim uas muaj cov kuab tshuaj proton yuav muab cov kuab tshuaj nqus tau loj heev uas yuav ua rau 1H -NMR spectrum. Feem ntau 1H - NMR spectra yog li ntawd sau tseg rau hauv cov kuab tshuaj deuterated, vim deuterium atoms nqus ntawm qhov sib txawv kiag li.
Vim li cas deuterium thiaj siv tsis tau hydrogen?
Lub deuterium nucleus yog ob zaug hnyav li hydrogen nucleus vim nws muaj cov neutron thiab proton. Yog li lub molecule uas muaj qee qhov deuterium yuav hnyav dua ib qho uas muaj tag nrho cov hydrogen. Raws li ib tug protein ntau deuterated, lub molecular mass nce correspondingly.
Vim li cas CDCl3 siv hauv NMR hloovCHCl3?
Vim CDCl3 muaj 1 deuterium (n=1), thiab hom spin yog 1 (I=1), koj tau 2(1)(1) + 1=3, yog li 3 peaks. Ordinary hydrogen muaj spin hom 1/2, uas yog vim li cas thiaj li muaj txoj cai sib txawv rau qhov ntawd (n + 1 txoj cai). Lub teeb liab CHCl3 yog ib lub singlet vim hais tias proton decoupling tau siv los sau cov ntaub ntawv.
Pom zoo:
Cov khoom xyaw twg hauv qab no ua cov tshuaj tsw qab hauv cov tshuaj txhuam hniav?
Sodium lauryl sulfate (SLS) yog surfactant feem ntau siv. YPuas yog tshuaj txhuam hniav puas yog surfactant? Surfactants. Ntau, txawm tias tsis yog tag nrho, tshuaj txhuam hniav muaj sodium lauryl sulfate (SLS) lossis lwm yam surfactants (detergents).
Cov piv txwv ntawm cov kuab tshuaj thiab cov kuab tshuaj yog dab tsi?
Solutes yog cov khoom uas yaj rau hauv cov kuab tshuaj thiab peb xaus nrog kev daws. Qee qhov piv txwv ntawm cov kuab tshuaj yog dej, ethanol, toluene, chloroform, acetone, mis nyuj, thiab lwm yam. Piv txwv ntawm cov kuab tshuaj muaj xws li, qab zib, ntsev, oxygen, thiab lwm yam … Cov dej dej muaj dej (kua kua) thiab yaj oxygen (solute).
Vim li cas cov alloys siv hauv cov khoom siv hluav taws xob cua sov?
Raws li peb paub alloys muaj siab resistivity thiab siab melting point piv rau cov hlau ntshiab. Yog li cov hlau tsis tuaj yeem yooj yim hlawv lossis oxidize ntawm qhov kub siab dua. Tam sim no raws li peb xav kom kub siab dua hauv cov khoom siv cua sov yog li peb siv cov alloys hauv cov khoom siv cua sov.
Puas muaj cov kuab tshuaj ntau dua li cov kuab tshuaj?
Ib tshuaj yog ib homogeneous sib tov ntawm ob los yog ntau tshaj tshuaj. Cov khoom uas muaj nyob rau hauv qhov loj tshaj plaws yog hu ua cov kuab tshuaj thiab ib qho tam sim no nyob rau hauv lub me me yog hu ua ib tug solute. Tsuas muaj ib qho kuab tshuaj xwb, tab sis muaj peev xwm ua tau ntau yam.
Vim li cas dej yog cov kuab tshuaj zoo rau recrystallization ntawm acetanilide?
Vim li cas dej yog cov kuab tshuaj zoo rau recrystallization ntawm acetanilide? Acetanilide nkag tau yooj yim yaj hauv dej kub, tab sis yog insoluble ntawm qis temps. Yog li, nws dissolves hauv dej kub tab sis crystalizes yooj yim thaum txias.
