Photophysical properties of novel lanthanide (Tb3+, Dy3+, Eu3+) complexes with long chain para-carboxyphenol ester p-L-benzoate (L=dodecanoyloxy, myristoyloxy, palmitoyloxy and stearoyloxy).
In this paper, a series of 12 binary luminescent lanthanide coordination compounds with long chain p-carboxyphenol ester were assembled. Both elemental analysis and infrared spectroscopy allowed to determine the complexes formula: LnL3, where Ln=Tb, Dy, Eu; L=p-dodecanoyloxybenzoate (12-OBA), p-myristoyloxybenzoate (14-OBA), p-palmitoyloxybenzoate (16-OBA) and p-stearoyloxybenzoate (18-OBA), respectively. The photophysical properties of these complexes were studied in detail with various of spectroscopies such as ultraviolet-visible absorption spectra, low temperature phosphorescence spectra and fluorescent spectra. The ultraviolet-visible absorption spectra showed that some bands shift with the different chain length of p-carboxyphenol ester. From the low temperature phosphorescent emission, the triplet state energies for these four ligands were determined to be around 24,242 cm-1 (12-OBA), 24,612 cm-1 (14-OBA), 24,084 cm-1 (16-OBA) and 24,125 cm-1 (18-OBA), respectively, suggesting they are suitable for the sensitization of the above lanthanide ions, especially for Tb3+ and Dy3+. The fluorescence excitation and emission spectra for these lanthanide complexes of the four ligands take agreement with the above predict from energy match.
Xu
Bing
B
Department of Chemistry, Tongji University, Shanghai 200092, PR China.
Yan
Bing
B
D001565:Benzoates / Q000138:chemical synthesis / Q000737:chemistry*; D004952:Esters / Q000138:chemical synthesis / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008956:Models, Chemical; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
D001565:Benzoates; D004952:Esters; D028581:Lanthanoid Series Elements