Lub synthesis thiab luminous yam ntxwv ntawm dej-soluble cellulose ether / EU (III)

Synthetic dej -soluble cellulose ether / EU (III) nrog luminous kev ua tau zoo, namely, carboxymethyl cellulose (CMC) / EU (III), methyl cellulose (MC) / EU (III), thiab Hydroxyeyl cellulose (HEC) / EU (III) tham txog cov qauv ntawm cov complexs thiab tau lees paub los ntawm FTIR. Lub tso tawm spectrum ntawm cov khoom sib tw yog EU (III) ntawm 615nm. Kev hloov hluav taws xob hloov pauv (los ntawm 5D0→7 F2). Kev hloov ntawm CMC cuam tshuam rau fluorescent spectrum thiab lub zog ntawm CMC / EU (III). Cov ntsiab lus EU (III) kuj cuam tshuam rau lub zog fluorescent ntawm cov complex. Thaum EU (III) cov ntsiab lus yog 5% (qhov loj piv), lub zog fluorescent ntawm cov dej-soluble cellulose ether EU (III) qhov sib tw mus txog qhov siab tshaj plaws.

Ntsiab lus: dej-soluble cellulose ether; Eu (III); sib phim; ci ntsa iab

1.Taw qhia

Cellulose yog linear macrometer ntawm lubβ-D glucose unit txuas nrog (1,4) cawv. Vim tias nws cov khoom txuas ntxiv dua tshiab, biodegradable, biocompatibility, txoj kev tshawb fawb ntawm cellulose yog nce ntau saib. Cellulose kuj tseem siv los ua cov khoom siv kho qhov muag, hluav taws xob, sib nqus, thiab catalytic kev ua tau zoo raws li ntau pawg neeg ua haujlwm alkyr oxygen ligand. Y.OKAMOTO thiab cov neeg koom tes tau kawm txog kev npaj cov ntawv xeem thiab cov ntawv thov uas muaj cov hlau tsis tshua muaj hauv ntiaj teb ion polymers. Lawv pom tias CMC / TB matched compuer muaj lub zog puag ncig polarizing fluorescent. CMC, MC, thiab HEC, raws li qhov tseem ceeb tshaj plaws thiab dav siv cellulose dej -soluble cellulose, tau txais kev saib xyuas zoo vim lawv cov kev ua tau zoo solubility thiab nws kim heev daim ntawv thov nqi, tshwj xeeb tshaj yog cov fluorescent labeling technology Cov qauv ntawm cellulose nyob rau hauv cov aqueous tov yog heev. siv tau.

Kab lus no qhia txog cov dej-soluble cellulose ether, uas yog kev npaj, qauv thiab fluorescent zog tsim los ntawm matomoid tsim los ntawm CMC, MC thiab HEC thiab EU (III).

2. Kev sim

2.1 Cov ntaub ntawv sim

CMC (degree ntawm kev hloov pauv (DS) yog 0.67, 0.89, 1.2, 2.4) thiab HEC tau ua siab zoo los ntawm KIMA CHEMICAL CO., LTD.

MC (DP = 450, viscosity 350 ~ 550mpa·s) yog tsim los ntawm KIMA CHEMICAL CO., LTD. Eu2O3 (AR) yog tsim los ntawm Shanghai Yuelong Chemical Factory.

2.2 Kev npaj ntawm CMC (HEC, MC) /Eu(III) complexes

EuCl3·6H2O tov (xov A): yaj Eu2Os hauv 1: 1 (ntim piv) HCI thiab dilute mus rau 4. 94X 10-2 mol / L.

CMC/Eu(III) complex solid state system: Dissolve 0.0853g ntawm CMC nrog sib txawv DSs nyob rau hauv dej, ces ntxiv quantitative Eu(III) dropwise rau nws aqueous tov, kom lub loj piv ntawm CMC:Eu(III) yog 19: 1. Do, reflux rau 24 teev, teb evaporate rau dryness, nqus tsev vacuum, grind rau hmoov nrog agate mortar.

CMC (HEC, MC/Eu(III) aqueous tov system: Siv 0.0853 g ntawm CMC (los yog HEC los yog MC)) qauv thiab yaj nyob rau hauv H2O, ces ntxiv ntau npaum li cas ntawm cov tshuaj A (los npaj sib txawv Eu(III) Concentration complex. ), stirred, rhuab rau reflux, tsiv mus rau ib tug tej yam npaum li cas ntawm volumetric hwj, ntxiv distilled dej dilute mus rau lub cim.

2.3 Fluorescence spectra ntawm CMC (HEC, MC) /Eu (III) complexes

Tag nrho cov txheej txheem aqueous tau ntsuas nrog RF-540 fluorescence spectrophotometer (Shimadzu, Nyiv). Lub CMC/Eu(III) solid-state system tau ntsuas nrog Hitachi MPE-4 fluorescence spectrometer.

2.4 Fourier transform infrared spectroscopy ntawm CMC (HEC, MC) /Eu (III) complexes

Lub FTIR IR ntawm lub complex tau solidified nrog Aralect RFX-65AFTIR thiab nias rau hauv KBr ntsiav tshuaj.

3. Cov txiaj ntsig thiab kev sib tham

3.1 Tsim thiab qauv ntawm CMC (HEC, MC) /Eu(III) complexes

Vim muaj kev sib cuam tshuam ntawm electrostatic, CMC nyob rau hauv qhov sib npaug hauv cov tshuaj dilute aqueous, thiab qhov kev ncua deb ntawm CMC molecular chains nyob deb, thiab kev sib nrig sib zog tsis muaj zog. Thaum Eu(III) ntxiv dropwise rau hauv cov tshuaj, CMC molecular chains nyob rau hauv cov kev daws Cov conformational zog yog tag nrho cov hloov, lub electrostatic tshuav nyiaj li cas ntawm thawj cov tshuaj raug puas lawm, thiab CMC molecular saw nyhav curl. Thaum Eu(III) ua ke nrog pawg carboxyl hauv CMC, txoj haujlwm sib koom ua ke yog random (1:16), Yog li, hauv cov kua dej diluted, Eu(III) thiab CMC tau sib koom ua ke nrog pawg carboxyl hauv cov saw, thiab Qhov kev sib txuas tsis sib xws ntawm Eu (III) thiab CMC molecular chains tsis zoo rau cov fluorescence emissions, vim nws ua rau ib feem ntawm txoj hauj lwm chiral ploj. Thaum cov tshuaj yog rhuab, lub zog ntawm CMC molecular chains yog ceev, thiab qhov kev ncua deb ntawm CMC molecular chains yog luv. Lub sijhawm no, kev sib txuas ntawm Eu(III) thiab carboxyl pawg ntawm CMC molecular chains yog qhov yooj yim tshwm sim.

Qhov kev sib txuas no tau lees paub hauv CMC/Eu(III) FTIR spectrum. Muab piv cov nkhaus (e) thiab (f), 1631cm-1 ncov hauv nkhaus (f) tsis muaj zog hauv (e), thiab ob lub ncov tshiab 1409 thiab 1565cm-1 tshwm hauv nkhaus (e), uas yog COO – Base vs thiab vas, uas yog, CMC / Eu (III) yog cov ntsev ntsev, thiab CMC thiab Eu (III) feem ntau yog khi los ntawm ionic bonds. Hauv qhov nkhaus (f), 1112cm-1 ncov tsim los ntawm kev nqus ntawm aliphatic ether qauv thiab qhov dav nqus siab ncov ntawm 1056cm-1 tshwm sim los ntawm cov qauv acetal thiab hydroxyl yog nqaim vim qhov tsim ntawm complexes, thiab cov peaks zoo tshwm sim. . Ob leeg ib leeg electrons ntawm O atom hauv C3-O thiab ib leeg khub electrons ntawm O atom hauv ether tsis koom nrog kev sib koom tes.

Sib piv cov nkhaus (a) thiab (b), nws tuaj yeem pom tau tias cov hlua ntawm MC hauv MC / Eu (III), txawm tias nws yog cov pa oxygen hauv pawg methoxyl lossis cov pa oxygen hauv lub nplhaib anhydrous qabzib, kev hloov pauv, uas qhia tau hais tias. uas nyob rau hauv MC Txhua cov pa oxygen koom nrog kev koom tes nrog Eu(III).

3.2 Fluorescence spectra ntawm CMC (HEC, MC) /Eu (III) complexes thiab lawv influencing yam

3.2.1 Fluorescence spectra ntawm CMC (HEC, MC) /Eu (III) complexes

Txij li thaum cov dej molecules yog cov fluorescence quenchers, qhov emission siv ntawm hydrated lanthanide ions feem ntau tsis muaj zog. Thaum Eu(III) ions tau koom tes nrog cov dej-soluble cellulose ether, tshwj xeeb tshaj yog nrog polyelectrolyte CMC molecules, ib feem los yog tag nrho cov dej molecules sib koom tes yuav raug tshem tawm, thiab cov emission siv ntawm Eu(III) yuav tsum tau txhim kho raws li qhov tshwm sim. Cov emission spectra ntawm cov complexes tag nrho muaj 5D0→7F2 hluav taws xob dipole hloov pauv ntawm Eu (III) ion, uas ua rau lub ncov ntawm 618nm.

3.2.2 Yam cuam tshuam rau cov khoom fluorescence ntawm CMC (HEC, MC) /Eu(III) complexes

Cov khoom ntawm cellulose ethers cuam tshuam cov fluorescence siv, piv txwv li, cov complexes CMC/Eu(III) tsim los ntawm txawv DSs muaj cov fluorescence sib txawv. Thaum DS ntawm CMC tsis yog 0.89, fluorescence spectrum ntawm complex ntawm CMC / Eu (III) tsuas muaj lub ncov ntawm 618nm, tab sis thaum lub DS ntawm CMC yog 0.89, nyob rau hauv qhov ntau ntawm peb cov kev sim, khoom CMC / Eu ( III) III) Muaj ob qhov tsis muaj zog emission peaks nyob rau hauv emission spectrum, lawv yog cov sib nqus dipole hloov 5D0→7F1 (583nm) thiab hluav taws xob dipole hloov 5D0→7 F3 (652nm). Tsis tas li ntawd, cov fluorescence intensities ntawm cov complexes kuj txawv. Hauv daim ntawv no, emission siv ntawm Eu(III) ntawm 615nm tau npaj tawm tsam DS ntawm CMC. Thaum lub DS ntawm CMC = 0.89, lub teeb siv ntawm solid-state CMC / Eu (III) mus txog qhov siab tshaj plaws. Txawm li cas los xij, viscosity (DV) ntawm CMC tsis muaj kev cuam tshuam rau kev siv fluorescence ntawm cov complexes nyob rau hauv lub Scope ntawm txoj kev tshawb no.

4 Kev xaus

Cov txiaj ntsig saum toj no qhia meej meej tias cov complexes ntawm cov dej-soluble cellulose ether / Eu (III) muaj fluorescence emission zog. Lub emission spectra ntawm cov complexes muaj qhov hloov hluav taws xob dipole ntawm Eu (III), thiab lub ncov ntawm 615nm yog tshwm sim los ntawm Tsim los ntawm 5D0→Kev hloov pauv 7F2, qhov xwm txheej ntawm cellulose ether thiab cov ntsiab lus ntawm Eu(III) tuaj yeem cuam tshuam rau kev siv fluorescence.