Video: Vim li cas CDCl3 yog siv los ua cov kuab tshuaj rau sau cov NMR spectrum ntawm ib qho kev sib txuas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Nws tuaj yeem yooj yim sib cais los ntawm compound tom qab dissolving tias raws li nws yog volatile nyob rau hauv qhov yog li yuav tau yooj yim evaporated. Vim muaj cov tsis-hydrogen atom nws tsis cuam tshuam rau kev txiav txim ntawm NMR spectrum . Raws li nws yog deuterated cov kuab tshuaj yog li nws lub ncov tuaj yeem txheeb xyuas tau yooj yim hauv NMR nrog rau qhov ntsuas TMS.
Ua raws li qhov no, vim li cas CDCl3 siv los ua cov kuab tshuaj hauv NMR?
CDCl3 yog ib yam kuab tshuaj 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.
Tsis tas li ntawd, vim li cas CDCl3 tshwm sim ua triplet? Nws los los ntawm kev sib cais los ntawm deuterium. Cov mis rau kev sib cais yog 2nI + 1, qhov twg n yog tus naj npawb ntawm nuclei, thiab kuv yog hom spin. Cov CDCl3 signal yog 1:1:1 triplet vim J coupling rau deuteron uas yog spin I = 1 nucleus muaj peb theem zog.
Hais txog qhov no, dab tsi hnyav siv hauv NMR?
Kom tsis txhob spectra dominated los ntawm cov kuab tshuaj teeb liab, feem ntau 1H NMR spectra raug kaw rau hauv cov kuab tshuaj deuterated. Txawm li cas los xij, kev deuteration tsis yog "100%", yog li cov cim qhia rau cov proton residual raug pom. Hauv chloroform Cov kuab tshuaj (CDCl3), qhov no sib raug rau CHCl3 , yog li lub teeb liab singlet pom ntawm 7.26 ppm.
Vim li cas CCl4 tsis siv hauv NMR?
Cov pa roj carbon tetrachloride ( CCl4 ) yog ib qho hnyav hnyav vim nws muaj tsis muaj protons, thiab ua ntej muaj tsis muaj 1 H NMR nqus. Txawm li cas los xij, ntau cov organic tebchaw yog tsis yog yaj los ntawm carbon tetrachloride. Cov kuab tshuaj no yog dav heev siv rau NMR spectra tias nws yog ib tsab xov xwm pheej yig ntawm kev lag luam.
Pom zoo:
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