Qhov sib txawv tseem ceeb ntawm scalar thiab dipolar coupling yog tias scalar coupling yog ywj siab ntawm molecular orientation, whereas dipolar coupling yog nyob ntawm kev taw qhia ntawm dipole-dipole vector.
Scalar coupling, J coupling, thiab dipolar coupling muaj feem xyuam rau ib leeg hauv kev sib cais tab sis txawv ntawm ib leeg raws li molecular orientation thiab scale ntawm qhov tseem ceeb. Scalar coupling tuaj yeem piav qhia tias yog ib feem ntawm isotropic ntawm kev sib txuas uas tsis muaj kev ywj pheej ntawm molecular orientation. Dipolar coupling tuaj yeem piav qhia raws li hom kev sib txuas uas nyob ntawm qhov kev taw qhia ntawm dipole-dipole vector.
Scalar Coupling yog dab tsi?
Scalar coupling yog ib feem ntawm isotropic coupling uas yog ywj siab ntawm molecular orientation. Nws tseem hu ua J coupling thiab tshwm sim ntawm nuclei uas txuas los ntawm cov tshuaj sib txuas. Hom kev sib txuas no tuaj yeem ua rau kev sib cais ntawm cov kab spectral rau ob qho tib si sib txuas los ntawm tus nqi J lossis qhov sib txuas tas li.
Daim duab 01: Ib NMR Scalar Coupling Ntoo
Nyob rau hauv kev sib piv rau dipole kev sib cuam tshuam, cov scalar coupling yog kho los ntawm cov ntawv cog lus. Dipole kev sib cuam tshuam / coupling yog kho los ntawm qhov chaw. Feem ntau, J coupling yog kev sib cuam tshuam tsis muaj zog piv rau Zeeman kev sib cuam tshuam. Feem ntau, peb tuaj yeem siv hom kev sib txuas no hauv ob qho tib si sib txuas nrog cov tshuaj hloov pauv rau kev txiav tawm ntawm kev sib txuas ntawm kev sib txuas hauv cov khoom me me thiab cov protein. Tsis tas li ntawd, J coupling qhov tseem ceeb feem ntau yog los ntawm 0.1 Hz hauv cov organic tebchaw mus rau 1 kHz ntau hauv kev hloov pauv hlau. Yog li, qhov ntsuas ntawm scalar coupling yog nyob rau kaum ntawm Hertz (Hz). Ntxiv mus, lub scalar coupling tuaj yeem txo qhov loj thaum muaj ntau daim ntawv cog lus nyob nruab nrab ntawm cov nuclei txuas. Tsis tas li ntawd, scalar couplings yog homonuclear lossis heteronuclear.
Dipolar Coupling yog dab tsi?
Dipolar coupling tuaj yeem piav qhia raws li hom kev sib txuas uas nyob ntawm kev taw qhia ntawm dipole-dipole vector. Hom kev sib txuas no ua rau muaj kev sib cais ntawm cov kab hauv NMR spectrum nyob rau hauv ib qho zoo sib xws rau scalar couplings.
Daim duab 2: Simulation ntawm Dipolar Coupling Powder Pattern nyob rau hauv Heteronuclear Ob Txoj Kev Spin
Txawm li cas los xij, tsis zoo li scalar coupling, lub dipolar coupling yog kho los ntawm qhov chaw vim hais tias cov scalar coupling yog kho los ntawm cov ntawv cog lus. Ntxiv mus, qhov tseem ceeb ntawm dipolar couplings feem ntau nyob rau hauv thaj tsam ntawm kiloHertz.
Dab tsi yog qhov zoo sib xws ntawm Scalar thiab Dipolar Coupling?
- Scalar thiab dipolar coupling mechanisms muab qhov sib cais zoo sib xws.
- Ob qho txiaj ntsig yog ntsuas hauv Hertz.
Qhov txawv ntawm Scalar thiab Dipolar Coupling yog dab tsi?
Qhov sib txawv tseem ceeb ntawm scalar thiab dipolar coupling yog tias scalar coupling yog ywj siab ntawm molecular orientation, whereas dipolar coupling yog nyob ntawm kev taw qhia ntawm dipole-dipole vector. Scalar coupling qhov tseem ceeb feem ntau yog los ntawm 0.1 Hz nyob rau hauv cov organic tebchaw mus rau 1 kHz ntau yam nyob rau hauv kev hloov cov hlau complexes, thaum lub sij hawm qhov tseem ceeb ntawm dipolar couplings feem ntau nyob rau hauv ntau ntawm kiloHertz.
Cov hauv qab no qhia txog qhov sib txawv ntawm scalar thiab dipolar coupling hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Scalar vs Dipolar Coupling
Scalar coupling, J coupling, thiab dipolar coupling muaj feem xyuam rau ib leeg hauv kev sib cais tab sis txawv ntawm ib leeg raws li molecular orientation thiab scale ntawm qhov tseem ceeb. Qhov sib txawv tseem ceeb ntawm scalar thiab dipolar coupling yog scalar coupling yog ywj siab ntawm molecular orientation, whereas dipolar coupling yog nyob ntawm kev taw qhia ntawm dipole-dipole vector.
