Qhov sib txawv tseem ceeb ntawm cov yas ethers thiab cryptands yog cov yas ethers yog cov qauv kev sib tw uas muaj ether pawg. Tab sis, cryptands yog cov qauv cyclic lossis non-cyclic uas muaj ether pawg thiab nitrogen atoms.
Crown ethers thiab cryptands yog cov organic tebchaw. Cov no yog cov qauv nyuaj thiab feem ntau yog cyclic compounds. Lawv muaj cov qauv zoo sib xws, tab sis cryptands yog cov xaiv ntau dua thiab muaj zog ntau dua thaum xav txog lawv lub peev xwm los tsim cov complexes nrog hlau ions.
Yuav ua li cas yog Crown Ethers?
YCrown ethers yog cyclic organic compounds uas muaj ether pawg. Lawv yog cov qauv nplhaib uas muaj ntau pawg ether. Cov no yog lub npe hu ua crown ethers vim hais tias thaum cov khoom sib txuas ua ke rau cov hlau ion, lawv zoo li lub kaus mom ntawm tib neeg lub taub hau. Cov tswv cuab feem ntau ntawm pawg ethers no yog oligomers ntawm ethylene oxide. Muaj tetramers, pentamers, hexamers, thiab lwm yam nyob ntawm seb muaj pes tsawg tus ether pawg nyob hauv lub nplhaib. Thaum naming lub crown ether, thawj tus naj npawb ntawm lub npe yog hais txog tus naj npawb ntawm atoms tam sim no nyob rau hauv lub compound, thaum lub thib ob tooj yog hais txog cov pa oxygen atoms nyob rau hauv lub compound.
Daim duab 01: Ib Series ntawm Crown Ether Molecules
Y Crown ethers tuaj yeem ua raws li ligands thiab me ntsis khi nrog cations, tsim complexes. Cov ib leeg electron khub ntawm oxygen atoms yog siv los ua cov kev sib koom tes sib koom ua ke. Sab nrauv ntawm lub nplhaib yog hydrophobic. Crown ethers muaj txiaj ntsig hauv theem hloov pauv catalysis vim tias lawv yog cov soluble hauv cov kuab tshuaj tsis muaj polar. Ntxiv mus, cov tebchaw no zoo li koom tes nrog Lewis acids ntawm kev sib cuam tshuam electrostatic.
Cryptands yog dab tsi?
Cryptands yog ib pawg ntawm cov organic tebchaw uas muaj ether pawg thiab nitrogen atoms. Cov no yog cov qauv cyclic lossis non-cyclic qauv. Peb tuaj yeem txhais lawv li bicyclic lossis polycyclic hluavtaws molecules. Lub npe ntawm cov tebchaw no, cryptands, yog muab vim lawv lub peev xwm los khi nrog cov substrates uas zoo li lawv nyob hauv crypt. Cov qauv ntawm cryptands zoo ib yam li cov qauv ntawm cov yas ethers, tab sis cov no yog ntau xaiv thiab muaj zog thaum nws los txog rau txoj kev tsim nrog cations.
Daim duab 02: Cov Qauv Tshuaj ntawm Cryptands
Qhov feem ntau cryptand yog [2.2.2]cryptand, uas muaj ob lub pa oxygen atoms ib qho ntawm peb txuas ntawm ob lub nitrogen atoms hauv cov molecule (saib duab saum toj no). Ntxiv mus, cryptands muaj kev sib raug zoo rau cov hlau cations xws li potassium ion. Sab hauv kab noj hniav ntawm peb-dimensional molecule yog qhov chaw khi rau cations. Thaum lub complex yog tsim, peb hu nws ib tug cryptate. Qhov tseem ceeb tshaj, cryptands tuaj yeem khi nrog cations los ntawm ob qho tib si nitrogen thiab oxygen atoms. Txawm li cas los xij, cov qauv ntawm cov tebchaw no ua rau lawv pom kev xaiv ntau dua rau alkali hlau cations.
Qhov txawv ntawm Crown Ethers thiab Cryptands yog dab tsi?
Crown ethers thiab cryptands yog cov organic tebchaw. Lawv muaj ze li cov qauv zoo sib xws nrog qhov sib txawv me ntsis. Qhov sib txawv tseem ceeb ntawm cov yas ethers thiab cryptands yog cov yas ethers yog cov qauv uas muaj ether pawg, thaum cryptands yog cov qauv cyclic lossis tsis-cyclic uas muaj ether pawg thiab nitrogen atoms.
Ntxiv mus, piv rau cov yas ethers, cryptands muaj kev xaiv ntau dua thiab muaj zog hauv kev tsim cov complexes nrog cations. Nws yog vim hais tias cov cryptands muaj ob qho tib si nitrogen thiab oxygen electron pub rau kev khi ntawm cations (crown ethers tsuas muaj oxygen atoms rau kev khi). Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm cov yas ethers thiab cryptands.
Summary – Crown Ethers vs Cryptands
Crown ethers thiab cryptands yog cov organic tebchaw. Lawv muaj ze li cov qauv zoo sib xws nrog qhov sib txawv me ntsis. Qhov sib txawv tseem ceeb ntawm cov yas ethers thiab cryptands yog cov yas ethers yog cov qauv cyclic uas muaj ether pawg thaum cryptands yog cov qauv cyclic lossis tsis-cyclic uas muaj ether pawg thiab nitrogen atoms.
