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Effect of Structure of Bidentate Schiff Base Type Bonded-Ligands Derived from Benzaldehyde on Photoluminescence Performance of Polymer-Rare Earth Complexes

Abstract

Two kinds of bidentate Schiff base ligands, benzaldehyde/m-aminophenol (BAMA) type and benzaldehyde/glutamic acid (BAGL) type ligands, both of which were derived from benzaldehyde, were synchronously synthesized and bonded on the backbone of polysulfone (PSF) through molecular design and polymer reactions, resulting in two functional polymers, PSF-BAMA and PSF-BAGL. Via coordination reaction, two series of novel luminescent polymer-rare earth complexes were prepared. In this work, the effects of the structures of the bonded ligands on the photoluminescence performance of the complexes were investigated in details, and for the different photophysical properties of the prepared complexes, the relevant theoretical explanations were given. The experimental results show that the bonded ligand BAMA can strongly sensitize the fluorescence emission of Eu(III) ion, and the binary complex PSF-(BAMA)3-Eu(III) emit strong red fluorescence under UV light because a larder conjugate π-bond system is contained in the structure of BAMA and there is a good energy level matching between the triplet state of BAMA and the resonant energy level of Eu(III) ion; while the bonded ligand BAGL can effectively sensitize the fluorescence emission of Tb(III) ion, and the binary complex PSF-(BAGL)3-Tb(III) exhibits strong green fluorescence by UV light because a smaller conjugate π-bond system is contained in the structure of BAGL and there is a good energy level matching between the triplet state of BAGL and the resonant energy level of Tb(III) ion. The two ternary complexes, PSF-(BAMA)3-Eu(III)-(Phen)1 (phenanthroline, Phen) and PSF-(BAGL)3-Tb(III)-(Phen)1, have much stronger fluorescence intensity than the corresponding binary complex because of two effects of Phen as the second ligand, synergistic coordination with the first ligand and replacing the coordinated water around the central ion, and the two roles have been confirmed by fluorescence spectrum and thermogravimetric analysis.

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Publication details

The article was received on 10 Nov 2017, accepted on 02 Jan 2018 and first published on 04 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP07590A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Effect of Structure of Bidentate Schiff Base Type Bonded-Ligands Derived from Benzaldehyde on Photoluminescence Performance of Polymer-Rare Earth Complexes

    B. Gao, L. Zhang and D. Zhang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP07590A

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