Europium complex of a tridentate ligand: synthesis and spectroscopic properties

Srinivasan, Radhika; Kanthimathi, M.S.; Parthasarathi, Ramakrishnan; Nair, Balachandran Unni

doi:10.1007/s11243-006-0180-4

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…The absorption bands assigned to the coordinated Eu-O and Eu-N bonds were observed at 422 cm À1 and 517 cm À1 , respectively. [61][62][63][64][65][66] All these pieces of evidence indicated that the Eu 3+ ions are coordinated to the ligand via the nitrogen atoms of terpyridine and the carbonyl oxygen atoms of the b-diketones.…”

Section: Structural Characterizationmentioning

confidence: 99%

Light emission of a polyfluorene derivative containing complexed europium ions

Turchetti

Nolasco

Szczerbowski

et al. 2015

Phys. Chem. Chem. Phys.

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The photophysical properties of a new alternating copolymer containing fluorene, terpyridine, and complexed sites with trivalent europium (Eu(3+)) ions (LaPPS66Eu) were investigated, using the non-complexed backbone (LaPPS66) and a low molecular weight compound of similar chemical structure of the ligand/Eu(3+) site (LaPPS66M) as a model compound. The analogous gadolinium complex (LaPPS66Gd) was also synthesized to determine the triplet state of the complex. (1)H and (13)C nuclear magnetic resonance (NMR) analysis, Fourier transform infrared (FT-IR) spectroscopy, inductively coupled plasma optical emission spectroscopy (ICP-OES), elemental analyses, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) characterized the chemical structure and thermal properties of the synthesized materials. A level of Eu(3+) insertion of 37% (molar basis) in the polymer backbone was achieved. The photoluminescence studies were performed in the solid state showing the occurrence of polymer-to-Eu(3+) energy transfer brought about by the spectral overlap between the absorption spectra of the Eu(3+) complex and the emission of the polymer backbone. A detailed theoretical photoluminescence study performed using time-dependent DFT (TD-DFT) calculations and the recently developed LUMPAC luminescence package is also presented. The high accuracy of the theoretical calculations was achieved on comparison with the experimental values. Aiming at a deeper level of understanding of the photoluminescence process, the ligand-to-Eu(3+) intramolecular energy transfer and back-transfer rates were predicted. The complexed materials showed a dominant pathway involving the energy transfer between the triplet of the dbm (dibenzoylmethane) ligand and the (5)D1 and (5)D0 Eu(3+) levels.

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Section: Structural Characterizationmentioning

confidence: 99%

Light emission of a polyfluorene derivative containing complexed europium ions

Turchetti

Nolasco

Szczerbowski

et al. 2015

Phys. Chem. Chem. Phys.

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show abstract

“…Selected IR data (KBr, cm −1 ); 3427(s), 3055(w), 2927(w), 2850(w), 1605(s), 1534(m), 1461(s), 1385(m), 1307(w), 1220(w), 1180(w), 828(w), 742(m). λmax (nm) (ɛ(M − 1 cm −1 )): 241 (78,111), 273 (31,374.5), 324 (13,982) and 411 (20,447)…”

Section: Hydrav-dymentioning

confidence: 99%

“…Lanthanide(III) ions are the best ions with the largest size that are able to form stable complexes with high coordination numbers [11]. In between, lanthanide (III) complexes containing Schiff base provide a highly organized class of compounds with interesting properties such as antifungal [12], antibacterial [13], anticancer [14], catalytic [15], electroluminescence and fluorescence, sensing [16][17][18] biological activities [19], and unique magnetic properties [20].…”

Section: Introductionmentioning

confidence: 99%