Dab tsi yog txhais los ntawm steric factor?
Dab tsi yog txhais los ntawm steric factor?

Video: Dab tsi yog txhais los ntawm steric factor?

Video: Dab tsi yog txhais los ntawm steric factor?
Video: Qhia txhais 50 zaj npau suav tias yog dab tsi part 3 15 Sep 2019 2024, Kaum ib hlis
Anonim

Kuj hu ua qhov tshwm sim yam , cov steric yam yog txhais raws li qhov piv ntawm qhov kev sim tus nqi ntawm tus nqi tas li thiab qhov kwv yees los ntawm kev sib tsoo txoj kev xav. Nws kuj tuaj yeem ua tau txhais raws li qhov piv ntawm cov pre-exponential factor thiab kev sib tsoo ntau zaus, thiab nws feem ntau tsawg dua kev sib sau.

Hauv qhov no, dab tsi yog qhov tseem ceeb ntawm cov organic chemistry?

Illustrated Glossary ntawm Organic Chemistry - Steric nyhuv. Steric cov nyhuv: Txhua yam cuam tshuam rau lub molecule, ib qho tshuaj tiv thaiv, thiab lwm yam vim qhov loj ntawm atoms lossis pawg. Nov yog ib qho piv txwv ntawm a tsis muaj zog cuam tshuam los ntawm tsis muaj zog hindrance: cov tertiary carbon yog ntau hindered tshaj cov thawj carbon.

Tom qab ntawd, lo lus nug yog, dab tsi yog qhov kev xav tau steric? A steric xav tau Nws yog lub zog uas nws yuav siv los kov yeej electrostatic repulsions los ntawm nqa atoms thiab molecules los ze zog ua ke. Ib qho kev faib ua feem ntawm lub zog kinetic los ntawm kev sib tsoo yog xav tau, yog li ua kom qeeb ntawm qhov tseeb ntawm cov tshuaj tiv thaiv (tshaj lub peev xwm lub zog thaiv).

Ua kom pom qhov no, txhais tau li cas los ntawm cov nyhuv steric?

Cov teebmeem steric yog cov teebmeem pom nyob rau hauv molecules uas los ntawm qhov tseeb hais tias atoms nyob qhov chaw. Thaum cov atoms muab tso ze rau ib leeg, qhov no raug nqi zog. Cov electrons nyob ze ntawm lub atoms xav nyob deb ntawm ib leeg. Qhov no tuaj yeem hloov txoj kev molecules xav hnov mob. Ib qho piv txwv ntawm cov teebmeem steric yog steric hindrance.

Dab tsi yog orientation factor?

Kev piav qhia: Orientation yam yog tus lej uas nyob nruab nrab ntawm 0 thiab 1. Nws sawv cev rau feem ntawm kev sib tsoo nrog ib qho kev taw qhia uas tso cai rau cov tshuaj tiv thaiv tshwm sim.

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