Qhov sib txawv tseem ceeb ntawm proton NMR ntawm methyl benzoate thiab phenylacetic acid yog tias proton NMR ntawm methyl benzoate tsis pom qhov ncov tom qab 8.05 ppm whereas phenylacetic acid qhia lub ncov ntawm 11.0 ppm.
Lub sij hawm NMR sawv rau Nuclear Magnetic Resonance. Kev tsom xam proton NMR yog qhov sib nqus sib nqus ntawm cov hluav taws xob nuclear uas txheeb xyuas cov protons hauv cov molecule. Cov qauv tshuaj ntawm methyl benzoate thiab phenylacetic acid yog ze li ntawm; Yog li, lawv cov duab proton NMR kuj qhia zoo sib xws. Yog li ntawd, nws yog ib qho tseem ceeb kom nkag siab qhov sib txawv ntawm ob daim duab NMR no.
Proton NMR ntawm Methyl Benzoate yog dab tsi?
Cov proton NMR ntawm methyl benzoate muaj nws qhov siab tshaj plaws ntawm 3.0 ppm txog 8.05 ppm. Methyl benzoate yog ib qho tshuaj tsw qab ester. Nws muaj cov pab pawg carbonyl txuas nrog -O-CH3 pawg thiab lub nplhaib benzene (phenyl pawg).
Thaum pom cov proton NMR ntawm methyl benzoate, peb tuaj yeem pom tias muaj qhov siab tshaj ntawm 3.89 ppm, 7.56 ppm, 7.66 ppm, thiab 8.05 ppm. Cov NMR peaks no sawv cev rau cov protons hauv qab no hauv methyl benzoate molecule.
- Peak ntawm 3.89 sawv cev rau peb lub hydrogen atoms (protons) txuas rau methyl pawg ntawm -O-CH3 pawg. Qhov no yog tib lub ncov vim tias peb lub protons yog tshuaj sib npaug. Txawm li cas los xij, qhov siab ntawm lub ncov yog qhov loj, qhia peb lub ncov.
- Peak ntawm 7.56 ppm sawv cev rau cov protons ntawm txoj haujlwm meta ntawm lub nplhaib benzene. Cov protons no kuj yog tshuaj sib npaug.
- Peak ntawm 7.66 ppm stands rau para positioned proton nyob rau hauv lub nplhaib benzene. Qhov no yog lub ncov tsis tshua muaj zog vim nws qhia tau hais tias ib qho proton.
- Peaks ntawm 8.05 ppm sawv rau ob lub protons ntawm ortho txoj hauj lwm ntawm benzene nplhaib. Ob lub proton no kuj yog tshuaj sib npaug.
Proton NMR ntawm Phenylacetic Acid yog dab tsi?
Proton NMR ntawm phenylacetic acid muaj nws qhov siab tshaj plaws ntawm 3.0 ppm txog 11.0 ppm. Phenylacetic acid yog ib qho carboxylic acid compound uas muaj lub nplhaib benzene (phenyl pawg) txuas rau pawg carboxylic ntawm -CH2- pawg.
Thaum cov proton NMR rau qhov sib xyaw no tau txais, peb tuaj yeem pom qhov siab ntawm 3.70 ppm, 7.26 ppm, 7.33 ppm, 7.23 ppm, thiab ntawm 11.0 ppm. Cov NMR peaks no sawv cev rau cov protons hauv qab no hauv phenylacetic acid molecule.
- Peak ntawm 3.70 sawv cev rau ob lub protons hauv pawg -CH2- uas txuas cov carbonyl carbon rau pawg phenyl. Qhov siab kawg no yog qhov loj vim tias nws sawv cev rau ob qhov sib npaug ntawm cov protons hauv ib qho NMR teeb liab.
- Peaks ntawm 7.23 ppm sawv rau ob lub protons ntawm ortho txoj hauj lwm ntawm lub nplhaib benzene.
- Peak ntawm 7.26 ppm sawv rau para positioned proton hauv pawg phenyl.
- Peaks ntawm 7.33 ppm sawv rau cov protons hauv txoj haujlwm meta ntawm lub nplhaib benzene.
- Lub ncov me me ntawm 11.0ppm yog qhov tshwj xeeb vim nws sawv cev rau hydrogen atom (proton) ntawm -OH pawg ntawm pawg carboxylic acid.
Qhov txawv ntawm Proton NMR ntawm Methyl Benzoate thiab Phenylacetic Acid yog dab tsi?
Lub sij hawm NMR sawv rau Nuclear Magnetic Resonance. Ib tug proton NMR tsom xam cov protons hauv ib lub molecule. Qhov sib txawv tseem ceeb ntawm proton NMR ntawm methyl benzoate thiab phenylacetic acid yog tias cov proton NMR ntawm methyl benzoate tsis pom qhov ncov tom qab 8.05 ppm whereas phenylacetic acid qhia qhov ncov ntawm 11.0 ppm.
Hauv qab infographic tabulates qhov sib txawv ntawm proton NMR ntawm methyl benzoate thiab phenylacetic acid.
Summary – Proton NMR ntawm Methyl Benzoate vs Phenylacetic Acid
Lub sij hawm NMR sawv rau Nuclear Magnetic Resonance. Ib tug proton NMR tsom xam cov protons hauv ib lub molecule. Qhov sib txawv tseem ceeb ntawm proton NMR ntawm methyl benzoate thiab phenylacetic acid yog tias cov proton NMR ntawm methyl benzoate tsis pom qhov ncov tom qab 8.05 ppm whereas phenylacetic acid qhia qhov ncov ntawm 11.0 ppm.
