PREPARATION AND FLUORESCENCE PROPERTIES OF SAMARIUM COMPLEXES CONTAINING POLYARYLETHERKETONES BEARING PENDANT CARBOXYL GROUPS

Abstract

The carboxyl-containing polyaryletherketones (PEK-1,PEK-2 and PEK-3) with excellent thermal properties and good film-formations prepared in our group were used as macromolecular ligands. Using 1,10-phenanthroline (Phen) as co-ligand and samarium ( Sm3 + ) as the central ion,a series of novel samarium coordination polymers (PEK-Sm3 + -Phen) were prepared. The FTIR and UV-Vis absorption spectra suggested that both the oxygen atoms of carboxyl groups of PEK and the nitrogen atoms of Phen were coordinated with Sm3 + ions. The XRD curves indicated Sm3 + ions could distribute homogeneously within the polymer matrix due to the formation of coordination bonds between Sm3 + and the carboxyl groups of PEK. The fluorescence spectra showed that all the coordination polymers obtained could exhibit the intense characteristic emission of Sm3 + ions under UV excitation. Moreover,their emission intensities were much higher than that of the corresponding small molecular complex ( Sm3 + -Phen) due to the introduction of PEK with the rigid polymer chain,which could result in the stable coordination structure and the low coordination symmetry around Sm3 + ion in the PEK-Sm3 + -Phen system. In addition,among the three coordination polymers obtained,PEK-1-Sm3 + -Phen showed the highest fluorescence intensity. The emission intensity of PEK-1-Sm3 + -Phen could reach a maximum value at the Sm3 + content of 15. 73 wt%.