Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions
Chosen polyoxometalate (POM) anions and their lanthanide(III) complexes, LnPOM, have been synthesized and spectroscopically characterized in solid state, aqueous and non-aqueous solutions. POMs, such as Keggin's, Dawson's and Anderson's type, Na9EuW10O36, compositions that function as...
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2003-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X03000370 |
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| author | Stefan Lis Slawomir But Andrzej M. Klonkowski Beata Grobelna |
| author_facet | Stefan Lis Slawomir But Andrzej M. Klonkowski Beata Grobelna |
| author_sort | Stefan Lis |
| collection | DOAJ |
| description | Chosen polyoxometalate (POM) anions and their lanthanide(III) complexes, LnPOM, have
been synthesized and spectroscopically characterized in solid state, aqueous and non-aqueous solutions.
POMs, such as Keggin's, Dawson's and Anderson's type, Na9EuW10O36, compositions that function as inorganic cryptands ([(Na)P5W30O110]14−-Preyssler anion, and [(Na)As4W40O140]27−), containing inorganic (Na+,K+,NH4+) or organic (tetrabutylammonium, NBu4+) counter cations were obtained and their Ln(III) complexes
(sandwiched and encapsulated) studied. The synthesized compounds were identified using elemental
and thermogravimetric analysis, UV-Vis spectrophotometry and FTIR spectroscopy. The complexation studies
were carried out with the use Nd(III) and Er(III) optical absorption and Eu(III) luminescence spectroscopy.
Luminescence characterization, including results of intensity, quantum yields and luminescence lifetimes of
EuPOM complexes in aqueous, non-aqueous solutions (DMF, DMSO, acetonitryle) and solid are discussed.
Based on luminescence lifetime measurements of the Eu(III) ion the hydration numbers of its sandwiched
(efficient emitters) and encrypted complexes have been determined and quenching effect discussed. The
Eu(III) complexes entrapped in a xerogel matrix have been studied as luminescent materials. Luminescence
intensity, lifetime and quantum yield of the EuPOM materials and their photochemical stability, during continuous
UV irradiation, were tested. |
| format | Article |
| id | doaj-art-c7eccfdc418f432889383ee25eb932f6 |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2003-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-c7eccfdc418f432889383ee25eb932f62025-02-03T05:53:46ZengWileyInternational Journal of Photoenergy1110-662X2003-01-015423323810.1155/S1110662X03000370Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutionsStefan Lis0Slawomir But1Andrzej M. Klonkowski2Beata Grobelna3Faculty of Chemistry, Adam Mickiewicz University, Poznań 60–780, PolandFaculty of Chemistry, Adam Mickiewicz University, Poznań 60–780, PolandDepartment of Chemistry, University of Gdańsk, Gdańsk 80–952, PolandDepartment of Chemistry, University of Gdańsk, Gdańsk 80–952, PolandChosen polyoxometalate (POM) anions and their lanthanide(III) complexes, LnPOM, have been synthesized and spectroscopically characterized in solid state, aqueous and non-aqueous solutions. POMs, such as Keggin's, Dawson's and Anderson's type, Na9EuW10O36, compositions that function as inorganic cryptands ([(Na)P5W30O110]14−-Preyssler anion, and [(Na)As4W40O140]27−), containing inorganic (Na+,K+,NH4+) or organic (tetrabutylammonium, NBu4+) counter cations were obtained and their Ln(III) complexes (sandwiched and encapsulated) studied. The synthesized compounds were identified using elemental and thermogravimetric analysis, UV-Vis spectrophotometry and FTIR spectroscopy. The complexation studies were carried out with the use Nd(III) and Er(III) optical absorption and Eu(III) luminescence spectroscopy. Luminescence characterization, including results of intensity, quantum yields and luminescence lifetimes of EuPOM complexes in aqueous, non-aqueous solutions (DMF, DMSO, acetonitryle) and solid are discussed. Based on luminescence lifetime measurements of the Eu(III) ion the hydration numbers of its sandwiched (efficient emitters) and encrypted complexes have been determined and quenching effect discussed. The Eu(III) complexes entrapped in a xerogel matrix have been studied as luminescent materials. Luminescence intensity, lifetime and quantum yield of the EuPOM materials and their photochemical stability, during continuous UV irradiation, were tested.http://dx.doi.org/10.1155/S1110662X03000370 |
| spellingShingle | Stefan Lis Slawomir But Andrzej M. Klonkowski Beata Grobelna Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions International Journal of Photoenergy |
| title | Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions |
| title_full | Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions |
| title_fullStr | Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions |
| title_full_unstemmed | Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions |
| title_short | Spectroscopic studies of Ln(III) complexes with polyoxometalates in solids, and aqueous and non-aqueous solutions |
| title_sort | spectroscopic studies of ln iii complexes with polyoxometalates in solids and aqueous and non aqueous solutions |
| url | http://dx.doi.org/10.1155/S1110662X03000370 |
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