Qhov sib txawv tseem ceeb ntawm hapticity thiab denticity yog tias hapticity yog hais txog kev sib koom tes ntawm ligand mus rau lub chaw hlau los ntawm kev sib txuas ntawm cov atoms whereas denticity yog hais txog kev khi ntawm ib lub ligand rau lub chaw hlau los ntawm covalent chemical bond tsim..
Cov ntsiab lus hapticity thiab denticity tuaj nyob rau hauv lub ntsiab lus ntawm kev sib koom tes chemistry qhov twg peb tham txog kev tsim cov kev sib koom ua ke los ntawm kev koom tes ntawm lub chaw hlau thiab ligands. Cov ligands no tuaj yeem khi nrog cov hlau sib txawv. Yog hais tias nws yog los ntawm ib tug series ntawm contiguous atoms, ces nws yog hais txog hapticity, tab sis yog hais tias cov ligands tsim covalent bonds nrog cov hlau, ces nws yog hais txog denticity.
Happicity yog dab tsi?
Hapticity yog kev sib koom tes ntawm lub ligand rau lub chaw hlau ntawm qhov tsis muaj kev cuam tshuam thiab sib txuas ntawm cov atoms. Peb tuaj yeem pom nws los ntawm η. Piv txwv li, yog tias ib lub ligand ua haujlwm los ntawm ob lub atom sib txuas, ces peb hais tias lub siab ntawm ligand yog η2. Feem ntau, peb siv cov ntawv no tsuas yog tias muaj ntau lub atoms koom nrog hauv kev sib koom tes. Cia peb xav txog ferrocene ua piv txwv;
Daim duab 01: Cov qauv ntawm Ferrocene
Lub chaw hlau ntawm ferrocene yog hlau (Fe), thiab muaj ob lub ligands ntawm cyclopentadienyl. Lub hapticity ntawm txhua ligand yog tsib vim hais tias lub electron huab ua haujlwm nrog lub chaw hlau thiab cov huab cua electron no los ntawm kev koom tes ntawm tag nrho tsib carbon atoms ntawm ligand. Lub cim yog ces η5 cyclopentadienyl.
Txawm li cas los xij, thaum muaj kev tshwm sim, kev zoo siab ntawm kev sib koom tes tuaj yeem hloov pauv. Cia peb xav txog qhov piv txwv hauv qab no. Thaum cov tshuaj tiv thaiv no, η6-benzene rings hloov mus rau η4-benzene.
Daim duab 02: Redox cov tshuaj tiv thaiv ntawm Ru(bz)2
Denticity yog dab tsi?
Denticity yog tus naj npawb ntawm pab pawg neeg ntawm tib lub ligand uas khi nrog lub chaw hlau. Feem ntau, tsuas yog ib qho atom ntawm ligand khi nrog cov hlau. Hauv qhov no, peb lub npe ligand ua monodentate ligand. Yog tias muaj ntau tshaj ib pawg neeg pub dawb uas khi nrog cov hlau nkag, ces peb muab lub npe ligand ua polydentate ligand. Lub denotation ntawm cov ligands yog los ntawm k-notation method. piv txwv li yog tias peb hais ib lub ligand txuas rau ib lub hlau los ntawm rau pab pawg neeg pub dawb, ces qhov cim yog k6.
Daim duab 03: Ob tug Bidentate Ligands txuas rau Pt Center
Feem ntau, polydentate ligands yog cov tshuaj chelates. Yog li ntawd peb faib lawv raws li lub denticity. Cov npe ntawm cov ligands yog los ntawm tus naj npawb ntawm pab pawg neeg pub dawb, piv txwv li yog tias muaj ob pawg neeg pub dawb, ces lub ligand yog bidentate. Qee lub sij hawm, cov ligand muaj ntau pab pawg neeg pub dawb, tab sis qee qhov ntawm lawv tau siv hauv kev sib koom tes, thiab lwm tus tsis siv. Thiab, cov pab pawg pub dawb no muaj los ua rau lwm hom tshuaj.
Qhov txawv ntawm Hapticity thiab Denticity yog dab tsi?
Peb yuav tsum nkag siab qhov sib txawv ntawm hapticity thiab denticity kom meej vim peb feem ntau siv cov ntsiab lus tsis raug, xav tias lawv zoo sib xws. Qhov sib txawv tseem ceeb ntawm hapticity thiab denticity yog tias hapticity yog hais txog kev sib koom tes ntawm ligand mus rau ib qho chaw hlau los ntawm kev sib txuas ntawm atoms, whereas denticity yog hais txog kev khi ntawm lub ligand rau lub chaw hlau los ntawm covalent chemical bond tsim. Yog li ntawd, nyob rau hauv txoj kev xav, hapticity muab cov naj npawb ntawm cov atoms sib txuas nrog cov txheej txheem kev sib koom tes thaum lub denticity muab cov naj npawb ntawm cov pab pawg ntawm ligand uas txuas nrog lub chaw hlau. Ntxiv mus, peb siv η-notation rau hapticity thiab k-notation rau denticity.
Hauv qab infographic qhia txog qhov sib txawv ntawm hapticity thiab denticity.
Summary – Hapticity vs Denticity
Nyob rau hauv cov ntsiab lus, hapticity thiab denticity yog ob lub ntsiab lus sib txawv hauv kev sib koom tes chemistry. Qhov sib txawv tseem ceeb ntawm hapticity thiab denticity yog tias hapticity yog hais txog kev sib koom tes ntawm ligand mus rau ib qho chaw hlau los ntawm kev sib txuas ntawm atoms, whereas denticity yog hais txog kev khi ntawm lub ligand rau lub chaw hlau los ntawm covalent chemical bond tsim.
