Qhov sib txawv tseem ceeb ntawm auxochrome thiab chromophore yog auxochrome yog ib pawg ntawm cov atoms uas hloov cov qauv ntawm chromophore, whereas chromophore yog molecular moiety uas muab cov xim ntawm cov molecule.
Chromophores tuaj yeem tso tawm xim thaum nws raug pom lub teeb pom kev. Qhov no yog vim hais tias chromophores tuaj yeem nqus cov wavelengths los ntawm qhov pom wavelength ntau ntawm lub teeb. Ib qho auxochrome yog qhov hloov kho ntawm cov qauv chromophore.
Auxochrome yog dab tsi?
Ib auxochrome yog ib pawg ntawm cov atoms uas tuaj yeem txuas rau chromophore, yog li ua kom muaj xim zoo nkauj ntawm chromophore. Yog li ntawd, nws yog ib qho kev hloov kho ntawm chromophore. Ib qho auxochrome nws tus kheej tsis tuaj yeem ua rau kev loj hlob ntawm cov xim. Nws tuaj yeem ua kom muaj peev xwm ntawm chromophore kom nqus cov wavelengths los ntawm pom ntau yam ntawm lub teeb. Qee qhov piv txwv rau pawg auxochrome suav nrog cov hauv qab no:
- Hydroxyl pawg (-OH)
- Amine group (-NH2)
- Aldehyde pab pawg (-CHO)
- Methyl mercaptan pawg (SCH3)
Yog li ntawd, auxochrome tuaj yeem txhais tau tias yog pawg ua haujlwm hauv cov molecule. Cov pab pawg ua haujlwm no muaj ib lossis ntau dua ib leeg electron khub. Cov electrons ib leeg no ua rau kev hloov pauv ntawm wavelength thiab kev siv zog ntawm kev nqus thaum txuas nrog chromophore. Qhov no yog ua los ntawm resonance; ib leeg electron khub undergo delocalization nrog pi-electron system hauv chromophore.
Ib auxochrome tuaj yeem ua kom cov xim ntawm cov organic compound. E.g. benzene yog cov xim tsis muaj xim, tab sis nitrobenzene yog xim daj xim (nitrobenzene muaj ib pawg nitro txuas nrog benzene). Ntawm no, pawg nitro yog ib qho chromophore rau benzene molecule. Thaum ib pab pawg hydroxyl tau txuas mus rau para txoj hauj lwm ntawm nitrobenzene, nws tshwm hauv cov xim daj tsaus (qhov kev siv ntawm nitrobenzene nce vim yog pawg auxochrome).
Chromophore yog dab tsi?
A chromophore yog ib feem ntawm cov molecule uas yog lub luag haujlwm rau cov xim ntawm cov molecule. Cov cheeb tsam no ntawm cov molecules muaj lub zog sib txawv ntawm ob qho tib si molecular orbitals uas ntog nyob rau hauv lub wavelength ntau yam ntawm pom spectrum. Tom qab ntawd, thaum pom lub teeb hits cheeb tsam no, nws absorbs lub teeb. Qhov no ua rau excitations ntawm electrons los ntawm ib lub xeev hauv av mus rau lub xeev zoo siab. Yog li ntawd, cov xim uas peb pom yog xim uas tsis absorbed los ntawm chromophore.
Daim duab 1: Conjugated ob daim ntawv cog lus uas tsim cov chromophore ntawm β-carotene molecule (hauv liab)
Nyob rau hauv cov roj ntsha molecules, chromophore yog ib cheeb tsam uas ua rau muaj kev hloov pauv ntawm cov molecule thaum ntaus los ntawm lub teeb. Conjugated pi systems feem ntau ua haujlwm ua chromophores. Lub conjugated pi system muaj ib daim ntawv cog lus thiab ob daim ntawv cog lus nyob rau hauv ib qho kev sib hloov. Cov tshuab no feem ntau tshwm sim hauv cov tshuaj tsw qab.
Qhov txawv ntawm Auxochrome thiab Chromophore yog dab tsi?
Qhov sib txawv tseem ceeb ntawm auxochrome thiab chromophore yog auxochrome yog ib pawg ntawm cov atoms uas hloov cov qauv ntawm chromophore, whereas chromophore yog molecular moiety uas muab cov xim ntawm cov molecule. Auxochromes tuaj yeem txuas rau chromophores thiab ua kom cov xim zoo nkauj ntawm chromophore.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm auxochrome thiab chromophore.
Summary – Auxochrome vs Chromophore
Auxochromes tuaj yeem txuas rau chromophores thiab ua kom cov xim zoo nkauj ntawm chromophore. Qhov sib txawv tseem ceeb ntawm auxochrome thiab chromophore yog auxochrome yog ib pawg ntawm cov atoms uas hloov cov qauv ntawm chromophore, whereas chromophore yog molecular moiety uas muab cov xim ntawm cov molecule.
