Sebopeho le litšobotsi tse khanyang tsa metsi -soluble cellulose ether/EU (III)

Synthetic water -soluble cellulose ether/EU (III) e nang le tšebetso e khanyang, e leng, carboxymethyl cellulose (CMC)/EU (III), methyl cellulose (MC)/EU (III), le Hydroxyeyl cellulose (HEC)/EU (III) e bua ka sebopeho sa li-complex tsena mme e netefatsoa ke FTIR. Sekhahla sa ho qala ha lintho tsena tse tsamaellanang ke EU (III) ho 615nm. Phetoho ea lipopi tsa motlakase (ka 5D0→7F2). Ho nkeloa sebaka ha CMC ho ama mabone a fluorescent le matla a CMC/EU (III). Litaba tsa EU (III) li boetse li ama matla a fluorescent a rarahaneng. Ha EU (III) dikahare ke 5%(boima karo-karolelano), matla fluorescent tsena metsi -soluble selulose ether EU (III) dipapadi fihla ho palo e kahodimodimo.

Mantsoe a sehlooho: metsi a qhibilihang ka har'a cellulose ether; Eu (III); nyalana; benyang

1.Selelekela

Cellulose ke macrometer ea mola oaβ-D glucose unit e hokahantsoeng ke joala (1,4). Ka lebaka la ts'ebeliso ea eona e nchafalitsoeng, e ka senyehang, ea ho sebelisana le biocompatibility, thuto ea cellulose e ntse e eketseha Ho shebiloe haholoanyane. Cellulose e boetse e sebelisoa e le motsoako oa ts'ebetso ea optical, motlakase, makenete, le catalytic e le alkyr oxygen ligand ea sehlopha sa liofisiri tse ngata. Y.OKAMOTO le basebetsi-'moho ba ithutile liteko tsa ho itokisa le lisebelisoa tse nang le li-polymer tsa ion tsa tšepe tsa lefatše tse sa tloaelehang. Ba hlokometse hore komporo e tsamaellanang le CMC/TB e na le fluorescent e matla e pota-potileng. CMC, MC, le HEC, e le cellulose ea bohlokoa ka ho fetisisa le e sebelisoang ka ho pharaletseng ea selulose e qhibilihang ka metsing, e fumane tlhokomelo e kholo ka lebaka la ts'ebetso ea bona e ntle ea ho qhibiliha le boleng bo pharaletseng ba kopo, haholo-holo theknoloji ea ho ngola fluorescent Sebopeho sa selulose ka tharollo ea metsi e matla haholo. e sebetsang hantle.

Sehlooho sena se tlaleha letoto la metsi -soluble cellulose ether, e leng ho lokisetsa, sebopeho le thepa ea fluorescent e entsoeng ke matomoid e entsoeng ke CMC, MC le HEC le EU (III).

2. Teko

2.1 Lisebelisoa tsa liteko

CMC (degree of substitution (DS) ke 0.67, 0.89, 1.2, 2.4) mme HEC li fanoe ka mosa ke KIMA CHEMICAL CO.,LTD.

MC (DP=450, viscosity 350 ~ 550mpa·s) e hlahisoa ke KIMA CHEMICAL CO.,LTD. Eu2O3 (AR) e hlahisoa ke Shanghai Yuelong Chemical Factory.

2.2 Tokisetso ea mathata a CMC (HEC, MC) /Eu(III)

EuCl3·Tharollo ea 6H2O (tharollo A): qhala Eu2Os ka 1: 1 (karolelano ea molumo) HCI le ho hlapolla ho 4. 94X 10-2 mol / L.

Sistimi e thata ea boemo bo tiileng ba CMC/Eu(III): Hlakola 0.0853g ea CMC ka li-DS tse fapaneng metsing, ebe u eketsa palo ea Eu(III) e theohang ho tharollo ea eona e nang le metsi, e le hore karolelano ea boima ba CMC:Eu(III) e be 19: 1. Hlohlelletsa, reflux bakeng sa lihora tse 24, rotary e fetoha mouoane ho omella, vacuum e omeletseng, sila ho fihlela phofo ka seretse sa agate.

CMC (HEC, MC/Eu(III) sisteme ea tharollo ea metsi: Nka 0.0853 g ea CMC (kapa HEC kapa MC)) ebe u e qhaqha ka H2O, ebe u eketsa mefuta e fapaneng ea tharollo A (ho lokisa Eu(III) Concentration complex e fapaneng. ), e tsosoa, e futhumetse ho reflux, e falliselitsoe ho tekanyo e itseng ea botlolo ea volumetric, e ekelitse metsi a hloekisitsoeng ho hlapolla letšoao.

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

Lisebelisoa tsohle tse rarahaneng tsa metsi li lekantsoe ka RF-540 fluorescence spectrophotometer (Shimadzu, Japane). Sistimi ea boemo bo tiileng ea CMC/Eu(III) e ne e lekantsoe ka spectrometer ea Hitachi MPE-4 fluorescence.

2.4 Fourier fetola spectroscopy ea infrared ea CMC (HEC, MC) /Eu(III) complexes

FTIR IR ea komporo e ile ea tiisoa ka Aralect RFX-65AFTIR mme ea hatelloa ka har'a matlapa a KBr.

3. Liphetho le Puisano

3.1 Sebopeho le sebopeho sa CMC (HEC, MC) /Eu(III) complexes

Ka lebaka la tšebelisano ea motlakase, CMC e leka-lekane ka tharollo ea metsi a hlapollang, 'me sebaka se pakeng tsa liketane tsa limolek'hule tsa CMC se hole,' me matla a mabeli a fokola. Ha Eu(III) e eketsoa ka ho theoha ka tharollo, liketane tsa limolek'hule tsa CMC ka tharollo Thepa ea conformational kaofela e fetotsoe, tekanyo ea electrostatic ea tharollo ea pele ea senyeha, 'me ketane ea limolek'hule ea CMC e na le tšekamelo ea ho kobeha. Ha Eu(III) e kopana le sehlopha sa carboxyl ho CMC, boemo ba tlamahano ke ntho e sa reroang (1:16), Ka hona, ka tharollo ea metsi a hlapollang, Eu(III) le CMC li hokahanngoa ka mokhoa o sa reroang le sehlopha sa carboxyl ka ketane, le. tlamahano ena e sa reroang lipakeng tsa Eu(III) le liketane tsa limolek'hule tsa CMC ha e ratehe bakeng sa tlhahiso e matla ea fluorescence, hobane e Etsa karolo ea boemo ba chiral e nyamele. Ha tharollo e futhumetse, motsamao oa liketane tsa limolek'hule tsa CMC oa potlakisa, 'me sebaka se pakeng tsa liketane tsa limolek'hule tsa CMC se khutsufatsoa. Ka nako ena, maqhama lipakeng tsa Eu(III) le lihlopha tsa carboxyl lipakeng tsa liketane tsa limolek'hule tsa CMC ho bonolo ho etsahala.

Kamano ena e tiisitsoe ho CMC/Eu(III) FTIR spectrum. Ha ho bapisoa li-curve (e) le (f), tlhōrō ea 1631cm-1 ka mokokotlo (f) e fokola ho (e), 'me litlhōrō tse peli tse ncha 1409 le 1565cm-1 li hlaha ka curve (e), e leng COO - Base vs le vas, ke hore, CMC/Eu(III) ke ntho ea letsoai, 'me CMC le Eu(III) li tlanngoe haholo ke li-ionic bonds. Ka curve (f), tlhōrō ea 1112cm-1 e entsoeng ka ho kenngoa ha sebopeho sa aliphatic ether le tlhōrō e pharaletseng ea ho monya ho 1056cm-1 e bakoang ke sebopeho sa acetal le hydroxyl e fokotsehile ka lebaka la ho thehoa ha li-complexes, 'me litlhōrō tse ntle li hlaha. . Li-electrone tse peli tsa O atom ho C3-O le li-elektronike tse peli tsa O atom ho ether ha lia ka tsa kenya letsoho khokahanyong.

Ha ho bapisoa li-curve (a) le (b), ho ka bonoa hore lihlopha tsa MC ho MC/Eu(III), ebang ke oksijene e sehlopheng sa methoxyl kapa oksijene e ka har'a selikalikoe sa tsoekere ea anhydrous, e fetoha. hore ho MC Li-oksijene tsohle li ameha ho hokahanya le Eu(III).

3.2 Fluorescence spectra ea CMC (HEC, MC) /Eu(III) complexes le mabaka a eona a susumetsang

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

Kaha limolek'hule tsa metsi ke li-fluorescence quenchers tse sebetsang hantle, matla a tlhahiso ea li-ion tsa hydrated lanthanide hangata a fokola. Ha li-ion tsa Eu(III) li hokahanngoa le cellulose ether e qhibilihang ka metsing, haholo-holo ka limolek'hule tsa polyelectrolyte CMC, karolo kapa limolek'hule tsohle tsa metsi tse hokahaneng li ka qheleloa ka thoko, 'me matla a tlhahiso ea Eu(III) a tla ntlafatsoa ka lebaka leo. Sebopeho sa tlhahiso ea li-complexes tsena kaofela li na le 5D0→Phetoho ea 7F2 ea dipole ea motlakase ea Eu(III) ion, e hlahisang tlhoro ho 618nm.

3.2.2 Lintlha tse amang thepa ea fluorescence ea CMC (HEC, MC) /Eu(III) complexes

Thepa ea cellulose ethers e ama matla a fluorescence, mohlala, li-complexes tsa CMC/Eu(III) tse entsoeng ke li-DS tse fapaneng li na le thepa e fapaneng ea fluorescence. Ha DS ea CMC e se 0.89, mahlaseli a fluorescence a rarahaneng a CMC/Eu(III) a na le tlhōrō feela ho 618nm, empa ha DS ea CMC e le 0.89, ka har'a mefuta ea liteko tsa rona, CMC / Eu e tiileng ( III) III) Ho na le litlhōrō tse peli tse fokolang tse tsoang moeeng, ke phetoho ea magnetic dipole 5D0.→7F1 (583nm) le phetoho ea dipole ea motlakase 5D0→7F3 (652nm). Ho feta moo, matla a fluorescence a li-complexes tsena a boetse a fapane. Ka pampiri ena, matla a tlhahiso ea Eu (III) ho 615nm a reriloe khahlanong le DS ea CMC. Ha DS ea CMC=0.89, matla a khanya a solid-state CMC/Eu(III) a fihla holimo. Leha ho le joalo, viscosity (DV) ea CMC ha e na phello ho matla a fluorescence a li-complexes tse ka har'a sebaka sa thuto ena.

4 Qetello

Liphetho tse ka holimo li tiisa ka ho hlaka hore li-complexes tsa cellulose ether/Eu(III) tse qhibilihang ka metsing li na le thepa e ntšang fluorescence. Ponahalo ea tlhahiso ea li-complexes tsena e na le phetoho ea dipole ea motlakase ea Eu(III), mme tlhoro ea 615nm e bakoa ke E hlahisitsoe ke 5D0.→Phetoho ea 7F2, mofuta oa cellulose ether le litaba tsa Eu(III) li ka ama matla a fluorescence.