Qhov sib txawv tseem ceeb ntawm sab hauv thiab sab nraud txheej txheem yog lub puab kheej kheej mechanism tshwm sim ntawm cov complexes ntawm ib tug khi ligand whereas txheej sphere mechanism tshwm sim ntawm complexes uas tsis hloov pauv.
Sab hauv sphere mechanism thiab sphere txheej txheem yog ob hom kev hloov hluav taws xob sib txawv hauv kev sib koom ua ke. Lub puab kheej kheej mechanism tshwm sim los ntawm kev sib cog lus los yog kev sib txuas thaum lub sphere txheej txheem tshwm sim ntawm ob hom sib cais.
Dab tsi yog Inner Sphere Mechanism?
Sab hauv sphere mechanism yog hom kev hloov hluav taws xob ntau tshaj plaws hauv kev sib koom ua ke. Nws yog ib hom tshuaj tiv thaiv redox. Qhov no electron hloov mus los ntawm covalent daim ntawv cog lus uas muaj nyob nruab nrab ntawm cov oxidant thiab cov reductant ntawm cov tshuaj tiv thaiv redox.
Nyob rau hauv no sphere mechanism, ib tug ligand ua tus choj ntawm cov hlau ions ntawm oxidant thiab cov reductant. Txawm li cas los xij, lub xub ntiag ntawm ligands loj inhibits lub puab-sphere mechanism. Nws yog vim hais tias lawv tiv thaiv kev tsim ntawm tus choj intermediates. Yog li ntawd, cov txheej txheem no tuaj yeem pom tsis tshua muaj nyob hauv cov kab ke lom neeg, vim tias muaj ntau pawg ntawm cov proteins tam sim no qhov twg cov tshuaj tiv thaiv redox tshwm sim.
Daim duab 01: Sab hauv Sphere Transfer Mechanism
Ntxiv mus, cov ligand uas koom nrog kev tsim ib tus choj hu ua bridging ligand. Nws yuav tsum yog hom tshuaj lom neeg uas tuaj yeem xa cov electrons. Feem ntau, cov ligands muaj ntau tshaj ib leeg electron khub. Yog li ntawd, nws tuaj yeem ua tus neeg pub khoom siv hluav taws xob.i.e. halides, hydroxide, thiocyanate yog ib co bridging ligands. Tsis tas li ntawd, kev tsim cov kev sib txuas ntawm kev sib txuas yog ib txoj kev thim rov qab. Lwm txoj hauv kev rau sab hauv-sphere mechanism yog qhov hloov pauv hluav taws xob sab nraud uas tshwm sim los ntawm cov tshuaj tsis sib txuas.
Outer Sphere Mechanism yog dab tsi?
Sab nraud sphere mechanism yog ib hom kev hloov hluav taws xob uas tshwm sim ntawm cov tshuaj sib cais. Ntawm no, ob hom tshuaj koom nrog hauv kev hloov hluav taws xob muaj nyob sib cais thiab tsis zoo ua ntej, thaum thiab tom qab cov txheej txheem hloov hluav taws xob. Txij li thaum ob hom sib cais, cov electrons raug yuam kom txav mus los ntawm qhov chaw ntawm ib hom mus rau lwm qhov.
Daim duab 02: Iron-Sulfur Proteins
Muaj ob qho piv txwv uas cov txheej txheem sab nraud tshwm sim:
- Kev sib pauv tus kheej: kev hloov pauv hluav taws xob tshwm sim ntawm ob hom tshuaj zoo tib yam uas muaj lub xeev oxidation sib txawv. Piv txwv li: degenerate cov tshuaj tiv thaiv ntawm tetrahedral ions ntawm permanganate thiab manganate.
- Iron-sulfur proteins: cov txheej txheem yooj yim rau kev ua haujlwm ntawm cov hlau-sulfur proteins. Kev hloov hluav taws xob tshwm sim sai hauv cov qauv no vim tias qhov sib txawv me me ntawm lawv.
Dab tsi yog qhov txawv ntawm Sab Hauv Sab Nraud thiab Sab Nraud Sab Nraud Mechanism?
Sab hauv thiab sab nraud cov txheej txheem yog ob hom kev hloov hluav taws xob sib txawv. Qhov sib txawv tseem ceeb ntawm sab hauv thiab sab nraud txheej txheem yog lub puab kheej kheej mechanism tshwm sim ntawm complexes los ntawm ib tug khi ligand, whereas sab-sphere mechanism tshwm sim ntawm complexes uas tsis hloov pauv. Qhov ntawd txhais tau tias; Cov txheej txheem txheej txheej txheej tshwm sim ntawm cov tshuaj lom neeg uas sib cais thiab tsis zoo ua ntej, thaum thiab tom qab hloov hluav taws xob. Yog li ntawd, bridging ligands tsis koom nrog cov txheej txheem sab nraud, hloov pauv, lawv hloov hluav taws xob los ntawm kev yuam cov electrons txav mus los ntawm qhov chaw. Tsis tas li ntawd, cov txheej txheem sab nraud yog ib txoj hauv kev rau lub puab-sphere mechanism.
Nyob hauv qab no yog ib sab ntawm kev sib piv ntawm qhov sib txawv ntawm sab hauv thiab sab nraud sphere mechanism.
Summary – Inner Sphere vs Outer Sphere Mechanism
Sab hauv thiab sab nraud cov txheej txheem yog ob hom kev hloov hluav taws xob sib txawv. Qhov sib txawv tseem ceeb ntawm sab hauv thiab sab nrauv kheej kheej mechanism yog tias puab kheej kheej mechanism tshwm sim ntawm complexes ntawm ib tug khi ligand whereas txheej sphere mechanism tshwm sim ntawm complexes uas tsis hloov pauv.
