|
|
|
|
| LEADER |
01000naa a22002652 4500 |
| 001 |
NLM200080091 |
| 003 |
DE-627 |
| 005 |
20231223215850.0 |
| 007 |
cr uuu---uuuuu |
| 008 |
231223s2010 xx |||||o 00| ||eng c |
| 024 |
7 |
|
|a 10.1021/la100525h
|2 doi
|
| 028 |
5 |
2 |
|a pubmed24n0667.xml
|
| 035 |
|
|
|a (DE-627)NLM200080091
|
| 035 |
|
|
|a (NLM)20684653
|
| 040 |
|
|
|a DE-627
|b ger
|c DE-627
|e rakwb
|
| 041 |
|
|
|a eng
|
| 100 |
1 |
|
|a Barbosa, A J
|e verfasserin
|4 aut
|
| 245 |
1 |
0 |
|a Enhanced Eu3+ emission in aqueous phosphotungstate colloidal systems
|b stabilization of polyoxometalate nanostructures
|
| 264 |
|
1 |
|c 2010
|
| 336 |
|
|
|a Text
|b txt
|2 rdacontent
|
| 337 |
|
|
|a ƒaComputermedien
|b c
|2 rdamedia
|
| 338 |
|
|
|a ƒa Online-Ressource
|b cr
|2 rdacarrier
|
| 500 |
|
|
|a Date Completed 27.12.2010
|
| 500 |
|
|
|a Date Revised 02.09.2010
|
| 500 |
|
|
|a published: Print
|
| 500 |
|
|
|a Citation Status PubMed-not-MEDLINE
|
| 520 |
|
|
|a Luminescent Eu(3+)-containing polyphosphate-tungstate aqueous colloidal systems were prepared and studied as a function of the relative polyphosphate-tungstate content. In polyphosphate-rich solutions, Eu(3+) ions occupy cagelike sites composed of phosphate groups from the metaphosphate chains. In these sites, an average number of 0.5 water molecule coordinates to an Eu(3+) ion and the (5)D(0) emission quantum efficiency is 0.22. Tungstate addition leads to important modifications in neighboring Eu(3+) leading to coordination sites in the aqueous medium where metal ions are completely hidden from interactions with solvent molecules. Transmission electron microscopy results clearly show W-rich nanoparticles with sizes between 5 and 10 nm for all tungstate relative concentrations. For high tungstate relative contents (above 30 mol %), spectroscopic results suggest the presence of Eu(3+) in polyoxometalate (POM)-like sites by comparison with the well-known decatungstoeuropate [EuW(10)O(36)](9-) structure. These new aqueous colloids display surprisingly high (5)D(0) emission quantum efficiencies of ca 80% because of the strong ligand field provided by tungstate POM ligands and the complete absence of water molecules from the Eu(3+) first coordination shell
|
| 650 |
|
4 |
|a Journal Article
|
| 700 |
1 |
|
|a Maia, L J Q
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Montanari, B
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Gonçalves, R R
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Messaddeq, Y
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Ferreira, R A S
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Carlos, L D
|e verfasserin
|4 aut
|
| 700 |
1 |
|
|a Ribeiro, S J L
|e verfasserin
|4 aut
|
| 773 |
0 |
8 |
|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1999
|g 26(2010), 17 vom: 07. Sept., Seite 14170-6
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
|
| 773 |
1 |
8 |
|g volume:26
|g year:2010
|g number:17
|g day:07
|g month:09
|g pages:14170-6
|
| 856 |
4 |
0 |
|u http://dx.doi.org/10.1021/la100525h
|3 Volltext
|
| 912 |
|
|
|a GBV_USEFLAG_A
|
| 912 |
|
|
|a SYSFLAG_A
|
| 912 |
|
|
|a GBV_NLM
|
| 912 |
|
|
|a GBV_ILN_22
|
| 912 |
|
|
|a GBV_ILN_350
|
| 912 |
|
|
|a GBV_ILN_721
|
| 951 |
|
|
|a AR
|
| 952 |
|
|
|d 26
|j 2010
|e 17
|b 07
|c 09
|h 14170-6
|