Qhov sib txawv tseem ceeb ntawm dπ-dπ daim ntawv cog lus thiab delta daim ntawv cog lus yog dπ-dπ daim ntawv cog lus nruab nrab ntawm d atomic orbital thiab ib qho khoob d atomic orbital whereas delta daim ntawv cog lus ntawm plaub lobes ntawm ib qho kev koom tes atomic orbital thiab plaub lobes ntawm lwm qhov cuam tshuam atomic orbital.
Ob leeg dπ-dπ daim ntawv cog lus thiab daim ntawv cog lus delta ntawm kev sib tshooj ntawm atomic orbitals. Qhov sib tshooj ntawm orbitals nyob rau hauv dπ-dπ daim ntawv cog lus tsim ib qho kev sib koom tes thaum lub sib tshooj hauv delta daim ntawv cog lus tsim ua ib daim ntawv cog lus tshuaj.
Dπ-dπ Bond yog dab tsi?
A dπ-dπ daim ntawv cog lus yog ib hom kev sib cog lus tshuaj lom neeg uas cov hlau khi nrog cov ligand los ntawm kev sib tshooj ntawm lawv cov d orbitals. Nyob rau hauv lwm yam lus, hom ntawm covalent tshuaj bonds daim ntawv no thaum lub puv d orbital ntawm kev hloov pauv hlau pub ib co ntawm nws cov electrons rau lub khoob d orbitals ntawm ib tug ligand los tsim kev sib koom tes tshuaj bonds. Yog li ntawd, cov tshuaj sib xyaw ua ke no yog hu ua kev sib koom ua ke.
Daim duab 01: Kev Koom Tes Covalent Compound
Tsis zoo li delta daim ntawv cog lus, uas zoo ib yam li cov qauv ntawm dπ-dπ daim ntawv cog lus, dπ-dπ daim ntawv cog lus tshwm sim ntawm qhov puv d orbital thiab ib qho khoob d orbital. Tsis tas li ntawd, ib daim ntawv cog lus delta tuaj yeem tshwm sim ntawm ob lub atoms uas muaj kev cuam tshuam atomic orbitals thaum lub dπ-dπ daim ntawv cog lus tshwm sim ntawm kev hloov hlau uas tau ua tiav d electron configuration thiab ib ligand muaj khoob orbitals hauv d electron plhaub.
Delta Bond yog dab tsi?
Delta daim ntawv cog lus yog ib hom tshuaj tiv thaiv uas plaub lub lobes ntawm ib qho kev cuam tshuam atomic orbital zoo li sib tshooj nrog plaub lub lobes ntawm lwm qhov cuam tshuam atomic orbital los tsim daim ntawv cog lus no. Hom orbital sib tshooj no ua rau kev tsim cov molecular orbital (kev sib txuas) uas muaj ob lub dav hlau nodal uas muaj cov axis internuclear, thiab uas mus los ntawm ob lub atoms. Tsab ntawv Greek rau delta kos npe "" yog siv rau lub cim ntawm daim ntawv cog lus delta.
Daim duab 02: Tsim ib daim ntawv cog lus ntawm Delta Chemical Bond
Feem ntau, lub orbital symmetry ntawm delta daim ntawv cog lus zoo ib yam li hom d atomic orbital li niaj zaus thaum xav txog cov nyiaj axis. Peb tuaj yeem soj ntsuam hom tshuaj sib txuas hauv cov atoms uas muaj d atomic orbitals uas muaj lub zog qis los koom nrog covalent tshuaj sib txuas. Piv txwv li, kev hloov cov hlau uas muaj nyob rau hauv cov tshuaj organometallic qhia delta bonding; chemical compounds ntawm qee cov hlau xws li rhenium, molybdenum, thiab chromium muaj plaub daim ntawv cog lus. Ib daim ntawv cog lus plaub plaub muaj ib daim ntawv cog lus sigma, ob daim ntawv cog lus pi, thiab daim ntawv cog lus delta.
Thaum xav txog qhov sib npaug ntawm qhov sib npaug ntawm daim ntawv cog lus delta, peb tuaj yeem pom tias qhov sib txawv ntawm qhov sib txawv ntawm pi antibonding orbital. Ib lub pi antibonding orbital muaj ib lub dav hlau nodal uas muaj cov axis internuclear thiab lwm lub dav hlau nodal uas yog perpendicular rau lub axis ntawm atoms.
Tus kws tshawb fawb Robert Mulliken tau qhia txog cov cim delta hauv xyoo 1931. Nws tau txheeb xyuas qhov kev sib cog lus no ua ntej siv cov tshuaj sib xyaw potassium octachlorodirhenate (III).
Qhov txawv ntawm dπ-dπ Bond thiab Delta Bond yog dab tsi?
dπ-dπ daim ntawv cog lus thiab daim ntawv cog lus delta yog ob hom kev cog lus tshuaj lom neeg. Qhov sib txawv tseem ceeb ntawm dπ-dπ daim ntawv cog lus thiab delta daim ntawv cog lus yog dπ-dπ daim ntawv cog lus ntawm ib qho d atomic orbital thiab ib qho khoob d atomic orbital whereas delta daim ntawv cog lus ntawm plaub lobes ntawm ib qho kev koom tes atomic orbital thiab plaub lobes ntawm lwm qhov kev koom tes atomic orbital..
Ua ntej infographic qhia txog qhov sib txawv ntawm dπ-dπ daim ntawv cog lus thiab daim ntawv cog lus delta hauv daim ntawv teev npe.
Summary – dπ-dπ Bond vs Delta Bond
dπ-dπ daim ntawv cog lus thiab daim ntawv cog lus delta yog ob hom kev cog lus tshuaj lom neeg. Qhov sib txawv tseem ceeb ntawm dπ-dπ daim ntawv cog lus thiab delta daim ntawv cog lus yog dπ-dπ daim ntawv cog lus ntawm ib qho d atomic orbital thiab ib qho khoob d atomic orbital whereas delta daim ntawv cog lus ntawm plaub lobes ntawm ib qho kev koom tes atomic orbital thiab plaub lobes ntawm lwm qhov kev koom tes atomic orbital..
Image Courtesy:
1. "CoA6Cl3" - Smokefoot assumed - Tsis muaj lub tshuab nyeem tau muab. Tus kheej ua haujlwm xav tias (raws li kev thov kev cai lij choj). (Public Domain) via Commons Wikimedia
2. "Delta-bond-formation-2D" Los ntawm Ben Mills - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia
