Qhov sib txawv tseem ceeb ntawm fluxionality thiab tautomerism yog qhov fluxionality yog hais txog kev hloov pauv ntawm qee lossis tag nrho cov atoms hauv cov molecule whereas tautomerism hais txog kev sib hloov ntawm protons ntawm molecules.
Ob nqe lus fluxionality thiab tautomerism yog hais txog kev sib hloov ntawm atom ntawm ntau txoj haujlwm xws li axial thiab equatorial txoj haujlwm. Yog tias cov haujlwm sib txawv no nyob ntawm tib lub molecule, ces nws yog fluxionality. Tab sis yog tias lub atom uas hloov pauv yog hydrogen atom (ib proton) thiab ntawm txoj haujlwm nyob hauv ob lub molecules sib txawv, ces nws hu ua tautomerism.
Fluxionality yog dab tsi?
Fluxionality yog hais txog lub peev xwm ntawm lub molecule kom dhau mus rau qhov kev hloov pauv hauv ib txoj hauv kev uas qee qhov lossis tag nrho cov atoms hauv cov molecule tau hloov pauv ntawm symmetry-sib npaug txoj haujlwm. Yuav luag tag nrho cov molecules peb paub yog fluxional rau qee qhov. Ib qho piv txwv zoo yog cov nyiaj sib hloov uas tshwm sim hauv cov organic tebchaw.
Feem ntau, peb xav txog ib qho molecule yog fluxional yog tias nws cov spectroscopic kos npe nthuav tawm cov kab dav dav vim kev sib pauv tshuaj. Txawm li cas los xij, qee zaum peb tsis tuaj yeem ntes cov cuab yeej ntawm fluxionality ntawm spectroscopy vim qhov qeeb ntawm kev sib hloov. Hauv cov ntsiab lus zoo li no, peb tuaj yeem siv txoj kev ntawm isotopic labeling rau qhov kev kuaj pom no.
Daim duab 01: Cov qauv tshuaj ntawm Phosphorous Pentafluoride
Ib yam molecule uas muaj fluxionality yog phosphorous pentafluoride. Thaum xav txog nws cov fluoride-NMR spectrum, nws muaj 31P-coupled doublet. Qhov no qhia tau hais tias cov molecule muaj fluorine atoms nyob rau hauv equatorial thiab axial txoj hauj lwm thiab lawv interchange sai heev thaum lub sij hawm tus txheej txheem ntawm NMR spectroscopy.
Tautomerism yog dab tsi?
Tautomerism yog ib lub tswv yim hauv chemistry uas piav txog cov txiaj ntsig ntawm muaj ntau lub tebchaw uas muaj peev xwm ntawm kev hloov pauv ntawm kev hloov pauv ntawm cov proton. Cov nyhuv no feem ntau tshwm sim hauv cov organic tebchaw xws li amino acids thiab nucleic acids. Cov txheej txheem ntawm qhov kev hloov pauv no yog hu ua tautomerization, uas yog ib hom tshuaj tiv thaiv. Ntawm no, kev hloov chaw ntawm protons txhais tau hais tias kev sib pauv ntawm hydrogen atom ntawm ob hom atoms. Cov atom hydrogen tsim ib daim ntawv cog lus nrog cov atom tshiab uas tau txais cov hydrogen atom. Cov tautomers muaj nyob rau hauv equilibrium nrog ib leeg. Lawv ib txwm muaj nyob hauv kev sib xyaw ntawm ob hom kev sib xyaw txij li lawv sim npaj ib daim ntawv tautomeric cais.
Daim duab 02: Tautomerism hauv Phenol
Thaum tautomerization, cov pob txha pob txha ntawm cov molecule tsis hloov. Tsuas yog txoj hauj lwm ntawm protons thiab electrons hloov. Tautomerization yog cov txheej txheem tshuaj intramolecular ntawm kev hloov pauv ntawm ib daim ntawv ntawm tautomer rau hauv ib daim ntawv sib txawv. Ib qho piv txwv zoo yog keto-enol Tautomerism. Nws yog cov tshuaj tiv thaiv acid lossis base-catalyzed. Feem ntau, keto daim ntawv ntawm cov organic compound yog ruaj khov dua, tab sis hauv qee lub xeev, daim ntawv enol ruaj khov dua li daim ntawv keto.
Qhov txawv ntawm Fluxionality thiab Tautomerism yog dab tsi?
Ob lub ntsiab lus fluxionality thiab tautomerism yog hais txog kev hloov pauv ntawm atom ntawm ntau txoj haujlwm. Qhov sib txawv tseem ceeb ntawm fluxionality thiab tautomerism yog tias fluxionality yog hais txog kev hloov pauv ntawm qee qhov lossis tag nrho cov atoms hauv cov molecule, thaum lub sij hawm tautomerism yog hais txog kev sib hloov ntawm protons ntawm molecules. Ntxiv mus, fluxionality tshwm sim hauv tib lub molecule thaum tautomerism tshwm sim ntawm ob lub molecules.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm fluxionality thiab tautomerism.
Summary – Fluxionality vs Tautomerism
Ob qho tib si fluxionality thiab tautomerism hais txog kev sib hloov ntawm atom ntawm ntau txoj haujlwm. Qhov sib txawv tseem ceeb ntawm fluxionality thiab tautomerism yog tias fluxionality yog hais txog kev hloov pauv ntawm qee qhov lossis tag nrho cov atoms hauv cov molecule, thaum lub sij hawm tautomerism yog hais txog kev sib hloov ntawm protons ntawm molecules.
