Qhov sib txawv tseem ceeb ntawm cov nyhuv resonance thiab mesomeric effect yog qhov resonance yog los ntawm kev sib cuam tshuam ntawm ib leeg electron khub thiab daim ntawv cog lus electron khub whereas cov nyhuv mesomeric tshwm sim vim muaj cov pab pawg hloov pauv lossis pab pawg ua haujlwm.
Ob lub tswv yim tshuaj ntawm resonance thiab mesomeric effect txiav txim siab cov qauv tshuaj lom neeg ntawm cov organic molecule. Lub resonance tshwm sim nyob rau hauv molecules muaj ib leeg electron khub ntawm ib qho ntawm cov atoms nyob rau hauv lub molecule. Cov nyhuv mesomeric tshwm sim yog tias ib lub molecule muaj cov khoom siv los yog cov pab pawg ua haujlwm. Ob qho xwm txheej no muaj nyob hauv cov organic molecules.
Resonance yog dab tsi?
Resonance yog ib txoj kev xav hauv chemistry uas piav txog kev sib cuam tshuam ntawm ib leeg electron khub thiab daim ntawv cog lus electron khub ntawm ib lub molecule. Qhov no txiav txim qhov tseeb qauv ntawm cov molecule. Peb tuaj yeem soj ntsuam cov nyhuv no hauv cov molecules uas muaj ib leeg electron khub thiab ob daim ntawv cog lus; lub molecule yuav tsum muaj ob qho kev cai no thiaj li qhia tau hais tias resonance. Ntxiv mus, cov nyhuv no ua rau lub polarity ntawm ib molecule.
Yuav muaj kev cuam tshuam ntawm ib leeg electron khub thiab pi bonds (ob daim ntawv cog lus) nyob ib sab. Yog li, tus naj npawb ntawm cov qauv resonance uas ib lub molecule tuaj yeem muaj nyob ntawm tus lej ntawm ib leeg electron khub thiab pi bonds. Tom qab ntawd peb tuaj yeem txiav txim siab qhov tseeb qauv ntawm cov molecule los ntawm kev saib cov qauv resonance; nws yog ib tug hybrid qauv ntawm tag nrho cov resonance qauv. Cov qauv hybrid no muaj lub zog qis dua li tag nrho lwm cov qauv resonance. Yog li ntawd, nws yog cov qauv ruaj khov tshaj plaws.
Daim duab 01: Resonance Structures of Phenol
Muaj ob hom ntawm resonance raws li qhov zoo resonance nyhuv thiab tsis zoo resonance nyhuv. Lawv piav qhia txog delocalization ntawm electrons nyob rau hauv qhov zoo nqi molecules thiab nyob rau hauv tsis zoo nqi molecules feem. Raws li qhov tshwm sim, ob daim ntawv no txhim kho cov nqi hluav taws xob ntawm cov molecule.
Mesomeric Effect yog dab tsi?
Mesomeric effect yog ib txoj kev xav hauv chemistry uas piav qhia txog kev ruaj khov ntawm cov molecules uas muaj cov pab pawg sib txawv thiab pab pawg ua haujlwm. Qhov no tshwm sim feem ntau vim tias qee cov pab pawg hloov pauv ua tus neeg pub khoom siv hluav taws xob thaum qee tus ua raws li cov neeg rho tawm hluav taws xob. Qhov sib txawv ntawm cov txiaj ntsig electronegativity ntawm cov atoms hauv cov pab pawg hloov pauv ua rau nws yog tus neeg pub khoom siv hluav taws xob lossis tus rho tawm.
Qee yam piv txwv rau cov pab pawg no yog raws li hauv qab no;
- Electron pub hloov pauv; -O, -NH2, -F, -Br, etc.
- Electron thim rov qab; -NO2, -CN, -C=O, thiab lwm yam.
Daim duab 02: Cov nyhuv tsis zoo Mesomeric
Ntxiv mus, cov khoom siv hluav taws xob pub dawb ua rau cov txiaj ntsig tsis zoo mesomeric thaum cov khoom siv hluav taws xob tshem tawm ua rau muaj txiaj ntsig zoo mesomeric. Tsis tas li ntawd, nyob rau hauv conjugated systems, cov nyhuv mesomeric txav raws qhov system. Nws suav nrog delocalization ntawm pi bond electron khub. Li no, qhov no stabilizes lub molecule.
Qhov txawv ntawm Resonance thiab Mesomeric Effect yog dab tsi?
Resonance yog ib txoj kev xav hauv chemistry uas piav txog kev sib cuam tshuam ntawm ib leeg electron khub thiab daim ntawv cog lus electron khub ntawm ib lub molecule whereas Mesomeric effect yog ib txoj kev xav hauv chemistry uas piav qhia txog kev ruaj khov ntawm cov molecules uas muaj cov pab pawg sib txawv thiab pab pawg ua haujlwm. Qhov no yog qhov sib txawv ntawm qhov sib txawv ntawm resonance thiab mesomeric effect. Tsis tas li ntawd, txawm hais tias lub resonance muaj kev cuam tshuam ncaj qha rau lub polarity ntawm lub molecule, mesomeric effect tsis muaj txiaj ntsig zoo. Ntxiv mus, kuj tseem muaj qhov sib txawv ntawm resonance thiab mesomeric effect hauv lawv qhov ua rau tshwm sim. Resonance tshwm sim vim muaj ob daim ntawv cog lus nyob ib sab ntawm ib leeg electron khub thaum mesomeric nyhuv tshwm sim vim muaj cov hluav taws xob pub dawb lossis tshem tawm cov pab pawg hloov pauv.
Summary – Resonance vs Mesomeric Effect
Resonance thiab mesomeric nyhuv yog muaj nyob rau hauv complex organic molecules. Qhov sib txawv tseem ceeb ntawm resonance thiab mesomeric nyhuv yog tias resonance yog tshwm sim los ntawm kev sib cuam tshuam ntawm ib leeg electron khub thiab daim ntawv cog lus electron khub thaum mesomeric nyhuv tshwm sim vim muaj cov pab pawg lossis pawg ua haujlwm.
