Qhov sib txawv tseem ceeb ntawm lub davhlau ya nyob twg thiab kev sib txuas carbonyls yog tias lub davhlau ya nyob twg carbonyl pawg muaj nws cov pa roj carbon atom sib txuas rau ib lub atom hlau, hos ib pab pawg bridging carbonyl muaj ob lub hlau atom txuas rau carbon atom.
Ib pawg carbonyl yog ib pab pawg ua haujlwm ua los ntawm cov pa roj carbon atom thiab oxygen atom; cov pa roj carbon atom muaj ib leeg electron khub. Ib pawg carbonyl davhlau ya nyob twg yog cov qauv yooj yim uas siv nws ib leeg electron khub ntawm cov pa roj carbon atom los khi nrog ib qho hlau atom. Ib qho kev sib txuas ntawm carbonyl pawg, ntawm qhov tod tes, yog ib qho kev sib txuas uas txuas ib khub hlau.
Terminal Carbonyls yog dab tsi?
Cov pab pawg davhlau ya nyob twg carbonyl yog cov qauv yooj yim thiab siv nws ib leeg electron khub ntawm cov pa roj carbon atom los khi nrog ib qho hlau atom. Txij li thaum nws tshwm sim ntawm lub davhlau ya nyob twg ntawm cov saw hlau, peb hu nws lub davhlau ya nyob twg carbonyl pawg. Cov pab pawg no tseem hu ua terminal ligand. Yog li ntawd, peb tuaj yeem piav qhia tias nws yog ib qho tsis yog hlau atom lossis pawg ua haujlwm uas yog sib koom ua ke los ntawm kev sib txuas ntawm cov tshuaj lom neeg rau ib qho ntawm cov atoms hauv cov tub ntxhais hlau ntawm pawg.
Daim duab 01: Terminal thiab Bridging Carbonyls
Peb tuaj yeem siv infrared spectroscopy los txheeb xyuas lub davhlau ya nyob twg thiab txuas cov carbonyl compounds. Lub davhlau ya nyob twg carbonyl pawg-muaj cov tebchaw qhia txog kev ncab ntawm 2000 - 2100 cm -1Qee cov piv txwv ntawm cov ntsiab lus dav hlau carbonyl muaj xws li carbamates, derivatives ntawm phosgene, lactams, thiab lwm yam.
Dab tsi yog Bridging Carbonyls?
Cov pab pawg sib txuas carbonyl yog cov qauv tsim thiab txuas ib khub hlau. Hauv lwm lo lus, nws ua tus choj txuas ob lub chaw hlau. Peb tuaj yeem siv infrared spectroscopy los txheeb xyuas lub davhlau ya nyob twg thiab txuas cov carbonyl compounds. Cov kev sib txuas ntawm cov pa roj carbonyl pawg uas muaj cov sib txuas qhia tau hais tias muaj qhov ncab ntawm 1720 - 1850 cm-1 Ib qho piv txwv ntawm kev sib txuas ntawm carbonyl yog Fe2(CO)
Qhov txawv ntawm Terminal thiab Bridging Carbonyls yog dab tsi?
Ib pawg carbonyl yog ib pawg ua haujlwm ua los ntawm carbon atom thiab oxygen atom, thiab carbon atom muaj ib leeg electron khub. Peb tuaj yeem faib pawg carbonyl ua ob; lub davhlau ya nyob twg thiab bridging carbonyls. Qhov sib txawv tseem ceeb ntawm lub davhlau ya nyob twg thiab bridging carbonyls yog tias lub davhlau ya nyob twg carbonyl pawg muaj nws cov pa roj carbon atom sib txuas rau ib lub atom hlau, hos ib pab pawg bridging carbonyl muaj ob lub hlau atoms sib txuas rau cov pa roj carbon atom.
Qee cov piv txwv ntawm cov ntsiab lus carbonyl muaj xws li carbamates, derivatives ntawm phosgene, lactams, thiab lwm yam, thaum Fe2(CO) 9yog ib qho piv txwv ntawm kev txuas carbonyl. Ntxiv mus, thaum siv infrared spectroscopy, terminal carbonyl pawg muaj ib tug stretching band ntawm 2000 - 2100 cm-1, thiab bridging carbonyl pawg muaj ib tug stretching band. ntawm 1720 – 1850 cm-1
Cov hauv qab no qhia txog qhov sib txawv ntawm lub davhlau ya nyob twg thiab txuas cov carbonyls hauv daim ntawv qhia rau kev sib piv ntawm ib sab.
Summary – Terminal vs Bridging Carbonyls
Ib pawg dav hlau carbonyl yog cov qauv yooj yim uas siv nws ib leeg electron khub ntawm carbon atom los khi nrog ib qho hlau atom. Ib qho kev sib txuas ntawm carbonyl pawg, ntawm qhov tod tes, yog ib qho kev sib txuas uas txuas ib khub hlau. Qhov sib txawv tseem ceeb ntawm lub davhlau ya nyob twg thiab bridging carbonyls yog tias lub davhlau ya nyob twg carbonyl pawg muaj nws cov pa roj carbon atom sib txuas rau ib lub atom hlau, hos ib pab pawg bridging carbonyl muaj ob lub hlau atoms sib txuas rau cov pa roj carbon atom. Qee qhov piv txwv ntawm cov ntsiab lus dav hlau carbonyl muaj xws li carbamates, derivatives ntawm phosgene, lactams, thiab lwm yam, thaum Fe2(CO) 9 yog ib qho piv txwv ntawm ib tug choj carbonyl.
