Qhov sib txawv tseem ceeb ntawm chelate thiab macrocyclic ligands yog tias chelate yog cov khoom sib xyaw uas muaj cov hlau nruab nrab ntawm cov atom sib txuas rau ligand muaj tsawg kawg yog ob lossis ntau qhov chaw pub dawb whereas macrocyclic ligand yog cov qauv loj cyclic muaj peb lossis ntau dua. cov chaw pub dawb.
Ib ligand yog ib qho molecule lossis ib qho ion uas tuaj yeem khi rau cov hlau atom lossis ion los ntawm kev pub nws cov khoom siv hluav taws xob ib leeg los tsim cov ntawv cog lus covalent. Cov chaw pub dawb yog cov chaw uas cov ligands pub ib leeg electron khub rau cov hlau atom lossis ion.
Chelates yog dab tsi?
Ib chelate yog ib qho chaw uas muaj lub hauv paus hlau atom txuas rau lub ligand muaj tsawg kawg yog ob lossis ntau qhov chaw pub dawb. Yog li ntawd, chelate yog tag nrho cov complex uas muaj lub hauv paus hlau atom thiab cov ligand. Lub complex no tseem hu ua coordination complex lossis coordination compound. Qee qhov kev sib koom ua ke muaj ob lossis ntau dua ligands sib txuas rau hauv nruab nrab hlau atom, tab sis ib qho chelate tsuas muaj ib lub ligand.
Daim duab 01: EDDS hlau complex
Muaj ntau pawg ntawm ligands. Lawv lub npe qhia tias muaj pes tsawg tus koom tes covalent bonds lawv tuaj yeem tsim tau. Piv txwv li, yog tias ib lub ligand tuaj yeem tsim tsuas yog ib qho kev sib koom tes covalent daim ntawv cog lus rau ib lub molecule, nws yog hu ua monodentate ligand. Ib yam li ntawd, yog tias muaj ob qhov chaw pub dawb, ces nws yog bidentate ligand. Lub denticity ntawm ligands piav txog qhov categorization no. Txij li thaum lub ligand txuas nrog lub hauv paus hlau atom ntawm ob lossis ntau qhov chaw pub dawb hauv chelate, lub ligand yog ib qho bidentate lossis polydentate ligand. Feem ntau, lub ligand ntawm ib tug chelate yog ib tug cyclic los yog ib lub nplhaib qauv. Cov ligands no tseem hu ua chelate agents.
Macrocyclic Ligands yog dab tsi?
A macrocyclic ligand yog ib lub voj voog loj loj uas muaj peb lossis ntau qhov chaw pub dawb. Ib qho macrocyclic ligand yog qhov tseem ceeb ntawm cov qauv cyclic loj. Muaj tsawg kawg yog peb lossis ntau qhov chaw pub dawb hauv macrocyclic ligand. Cov ligands no qhia txog kev sib raug zoo rau cov hlau ions.
Daim duab 1: Phthalocyanine yog ib qho piv txwv tseem ceeb rau macrocyclic ligands.
Macrocyclic ligands yog qhov tseem ceeb polydentate. Yog li ntawd, cov ligands muab kev ywj pheej tsawg dua rau cov hlau ion. Ntawd yog, cov ligands yog "pre-organized" rau kev khi. Thaum lub macrocyclic ligand bonds rau ib tug hlau ion, tag nrho cov qauv yog hu ua ib tug macrocyclic complex. Ib qho ntawm feem ntau macrocyclic ligands yog phthalocyanine. Kev siv cov ligands yog dyes thiab pigments.
Qhov txawv ntawm Chelate thiab Macrocyclic Ligands yog dab tsi?
Chelate vs Macrocyclic Ligands |
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| Ib lub chelate yog cov khoom sib xyaw uas muaj lub hauv paus hlau atom txuas rau lub ligand muaj tsawg kawg yog ob lossis ntau qhov chaw pub dawb. | A macrocyclic ligand yog ib lub voj voog loj loj uas muaj peb lossis ntau qhov chaw pub dawb. |
| Nature | |
| Kev sib koom ua ke | A pub molecule |
| Nyob qhov chaw | |
| Lub ligand muaj tsawg kawg yog ob lossis ntau qhov chaw pub dawb. | Lub ligand muaj tsawg kawg yog peb lossis ntau qhov chaw pub dawb. |
| Lub ligand yog bidentate lossis polydentate. | Qhov tseem ceeb yog polydentate ligand. |
Summary – Chelate vs Macrocyclic Ligands
Chelates yog kev sib koom ua ke. Macrocyclic ligands yog pub dawb molecules uas tuaj yeem pub dawb ib leeg electron khub los tsim kev sib koom tes covalent bonds nrog lub hauv paus hlau atom lossis ion. Qhov sib txawv tseem ceeb ntawm chelate thiab macrocyclic ligands yog tias chelate yog ib qho chaw uas muaj lub hauv paus hlau atom sib txuas nrog lub ligand muaj tsawg kawg yog ob lossis ntau qhov chaw pub dawb whereas macrocyclic ligand yog cov qauv loj loj uas muaj peb lossis ntau qhov chaw pub dawb.
Image Courtesy:
1. "EDDS hlau complex" Los ntawm Yidele (hais lus) - Tus kheej ua haujlwm - siv ChemDraw Ultra 11.0 (Public Domain) ntawm Commons Wikimedia
2. "Phthalocyanine" Los ntawm Choij - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia
