Qhov sib txawv tseem ceeb ntawm carbonyl thiab nitrosyl complexes yog carbonyl complexes muaj -CO ligands, whereas nitrosyl complexes muaj -NO ligands.
Kev sib koom ua ke yog inorganic complexes uas muaj lub hauv paus atom los yog ib qho ion (feem ntau yog cov hlau ion) thiab ib puag ncig cov molecules hu ua ligands uas yog khi rau hauv nruab nrab atom lossis ion. Lub hauv paus atom lossis ion feem ntau hu ua lub chaw sib koom tes.
Dab tsi yog Carbonyl Complexes?
Carbonyl complexes yog kev sib koom ua ke uas muaj cov hlau nruab nrab thiab carbonyl ligands. Cov carbonyl ligands uas peb tuaj yeem pom hauv cov complexes yog -CO ligands. Peb tuaj yeem nquag siv carbonyl ligands ua cov khoom pib rau lwm cov kev sib koom ua ke ib yam nkaus vim tias -CO ligands tsis muaj nqi, thiab CO yog cov khoom siv roj. Qhov no ua rau nws yooj yim los ua ib qho ligand hloov tau yooj yim los ntawm purging CO tawm ntawm cov tshuaj tiv thaiv hlab ntsha.
Thaum xav txog kev khi ntawm -CO ligands rau lub chaw hlau, peb tuaj yeem pom tias nws feem ntau tshwm sim los ntawm kev sib koom ua ke ntawm ib leeg electron khub ntawm CO molecule thiab lub chaw hlau. Ntawm no, CO ligand ua raws li lub davhlau ya nyob twg ligand vim nws tsuas muaj ib daim ntawv cog lus ntawm ib sab. Kev sib txuas ntawm CO ligand tshwm sim los ntawm Carbon atom ntawm CO molecule. Ntxiv mus, kev sib koom ntawm ib leeg electron khub tuaj yeem tshwm sim ntawm ib, ob, lossis peb lub chaw hlau. Ntawm no, cov chaw hlau no yuav tsum muaj kev sib txuas nrog cov hlau-hlau bonds. Thaum ntau tshaj ib lub chaw hlau koom nrog hauv kev tsim cov carbonyl complexes, -CO ligand ua raws li kev sib txuas ntawm ligand. Tsis tas li ntawd, yog tias ob lub hlau uas nyob hauv cov hlau-hlau daim ntawv cog lus sib txawv ntawm ib leeg, qhov ntawd txhais tau hais tias ib qho hlau tuaj yeem nyiam cov CO ligand ntau dua li lwm cov hlau raws li electronegativity. Hauv qhov xwm txheej no, CO ligand ua ib qho kev sib txuas ib nrab.
Tsis tas li ntawd, -CO ligand hauv carbonyl complexes yuav tshwm sim hauv pi-electron pub hom thiab. Ntawm no, cov pi electrons ntawm CO molecule tau koom nrog hauv electron pub dawb rau cov hlau orbitals. Tab sis cov complexes siv tau cov electrons hauv conjugation nrog cov electron khub ntawm carbon atoms ntawm CO ligand. Qhov no yog vim hais tias ib leeg electron khub ntawm carbon atom muaj lub zog siab piv rau pi electrons.
Piv txwv ntawm Carbonyl Complexes
Qee yam piv txwv rau carbonyl complexes yog:
- [Co(CO)63+
- [Fe(CO)62+
- [Rh(CO)63+
- [Mn(CO)6+
- [V(CO)6–
Nitrosyl Complexes yog dab tsi?
Nitrosyl complexes yog kev sib koom ua ke ntawm lub chaw hlau thiab nitric oxide ligands. Cov tshuaj formula ntawm no ligand yog -NO, uas yog khi rau ib tug hloov pauv hlau chaw. Feem ntau, cov ligand no tshwm sim raws li nitrosyl cation: TSIS +. Cov cation no yog isoelectronic nrog CO ligand. Yog li ntawd, kev sib txuas ntawm cov hlau thiab NO thiab cov nyiaj ntawm cov hlau thiab CO ligand muaj cov khoom zoo ib yam.
Tsis muaj ligand ua raws li ob lub tshuab hluav taws xob pub dawb uas nws koom nrog ib leeg electron khub nrog lub chaw hlau. Tsis tas li ntawd, nws tuaj yeem txais cov khoom siv hluav taws xob los ntawm cov hlau los ntawm cov txheej txheem rov qab sib txuas. Txawm li cas los xij, nyob rau hauv cov ntsiab lus ntawm kev suav electron, ob txoj kab tsis muaj ligands yog tshuaj sib npaug rau peb kab CO ligands.
Daim duab 01: Kab thiab Bent Nitrosyl Ligands
Ntxiv mus, tuaj yeem muaj cov kab lossis khoov nitrosyl ligands. Linear NO ligand muaj peb covalent bonds ntawm N thiab O atoms, thaum khoov NO ligand muaj ob covalent bonds ntawm N thiab O atoms. Feem ntau, TSIS MUAJ ligand tsim ib qho kev sib cog lus ntawm kev hloov pauv hlau thiab lub ligand, thaum khoov NO ligands tshwm sim thaum cov txheej txheem rov qab sib txuas tsis tseem ceeb.
Qhov txawv ntawm Carbonyl thiab Nitrosyl Complexes yog dab tsi?
Carbonyl complex thiab nitrosyl complex yog ob hom kev sib koom ua ke uas muaj qhov hloov pauv hlau thiab ligands nyob ib puag ncig lub chaw hlau. Qhov sib txawv tseem ceeb ntawm carbonyl thiab nitrosyl complexes yog carbonyl complexes muaj -CO ligands, whereas nitrosyl complexes muaj -NO ligands.
Cov duab hauv qab no qhia qhov sib txawv ntawm carbonyl thiab nitrosyl complexes hauv daim ntawv.
Summary – Carbonyl vs Nitrosyl Complexes
Carbonyl complexes yog kev sib koom ua ke uas muaj cov hlau nruab nrab thiab carbonyl ligands. Nitrosyl complexes yog cov sib koom ua ke uas muaj cov hlau nruab nrab thiab nitric oxide ligands. Yog li ntawd, qhov sib txawv tseem ceeb ntawm carbonyl thiab nitrosyl complexes yog carbonyl complexes muaj -CO ligands, whereas nitrosyl complexes muaj -NO ligands.
