Synthesis of siloxane-based PAMAM dendrimers and luminescent properties of their lanthanide complexes |
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Authors: | Yuzhong Niu Haifeng Lu Yuanzhi Yue |
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Institution: | a Key Laboratory of Special Functional Aggregated Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China b School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China |
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Abstract: | The 0.5-2 generations of siloxane-based PAMAM dendrimers with 1, 3-bis(3-aminopropyl) tetramethyldisiloxane (G0) as core unit were synthesized by two different methods. Their structures were characterized by FTIR, 1H NMR, 13C NMR, LC/MS, TGA, and DSC. Results show that method two is more suitable as its synthetic procedure is simple and it provides higher yield than method one. DSC analysis indicates that the introduction of the siloxane linkage into the interior of the dendrimers has significant effect on the flexibility of the dendrimer structures. Lanthanide complexes of the newly designed siloxane-based PAMAM dendrimers were obtained by complexing with Eu(III) and Tb(III), respectively. The luminescent properties of the complexes in the solution were investigated. Narrow-width red and green emissions were observed from the complexes of G0.5, G1.5, and G2.0, indicating intramolecular energy transfer process takes place between ligands and lanthanide ions. |
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Keywords: | Synthesis Siloxane PAMAM dendrimers Luminescent properties Lanthanide complexes |
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