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 AJAC  Vol.5 No.17 , December 2014
Syntheses and Co-Fluorescence of Complexes of Eu (III)/Gd (III) with Thienyltrifluoroacetonate, Terephthalic Acid and Phenanthroline
Abstract: A series of complexes of europium (III)/gadolinium (III) with 2-thienyltrifluoroacetonate (HTTA), terephthalic acid (TPA) and phenanthroline (Phen) were synthesized by coprecipitation. The resulting complexes including Eu2(TPA)(TTA)4Phen2, Eu1.4Gd0.6(TPA)(TTA)4Phen2, Eu1.0Gd1.0(TPA)(TTA)4Phen2 and Eu0.8Gd1.2(TPA)(TTA)4Phen2 were characterized by elemental analysis, IR spectroscopy and thermal stability analysis. The results of analysis indicate that the complexes obtained have similar binuclear structure with each other. The thermal stability analysis indicates that the complexes Eu2(TPA)(TTA)4Phen2and Eu1.0Gd1.0(TPA)(TTA)4Phen2 possess good thermal stability, which melt at ~241°C and decompose at ~370°C - 430°C corresponding to the formation of the complexes. The fluorescence spectra of Eu2(1-x)Gd2x(TPA)(TTA)4Phen2 (x = 0 - 1) complex powders and their doped silica gels were studied. The co-fluorescence effect of Gd3+ ions in complex powders is different from that of their doped silica gels. The optimum concentration of Gd3+ for complex powders and their doped silica gels is 0.5 and 0.3 (molar fraction), respectively. The co-fluorescence distinction of Gd3+ ions for complex powders and their doped silica gels is preferably interpreted from the proposed binuclear structure together with monomolecular compositions of the complexes for the first time. Both intermolecular energy transfer and intra molecular energy transfer in cross binuclear monomolecular EuGd(TPA)(TTA)4Phen2 are thought to be responsible for the co-fluorescence effect of the complex powders; yet only the latter is thought to be responsible for the co-fluorescence effect in silica gels, for the complex molecules in this case are isolated from each other.
Cite this paper: Zhao, X. , Hu, Z. , Jiang, H. , Jiao, F. and Wang, Z. (2014) Syntheses and Co-Fluorescence of Complexes of Eu (III)/Gd (III) with Thienyltrifluoroacetonate, Terephthalic Acid and Phenanthroline. American Journal of Analytical Chemistry, 5, 1313-1321. doi: 10.4236/ajac.2014.517137.
References

[1]   Richardson, F.S. (1982) Terbium(III) and Europium(III) ions Ions as Luminescent Probes and Stains for Biomolecular System. Chemical Reviews, 82, 541-552.
http://dx.doi.org/10.1021/cr00051a004

[2]   Wang, Z.M. (2000) Advance in Study of Light Transform Farm Film Doped with Rare Earth in China. Chinese Rare Earths, 21, 55-59.

[3]   Li, B., Ma, D., Zhang, H.J., et al. (1998) Electroluminescence Devices Based on Monohexadecyl Phthalate Terbium. Thin Solid Films, 325, 259-263.
http://dx.doi.org/10.1016/S0040-6090(98)00506-9

[4]   Liu, H.G., Seongtae, P., Kiwan, J., et al. (2004) Influence of Ligands on the Photoluminescent Properties of Eu3+ in Europium β-Diketonate/PMMA-Doped Systems. Journal of Luminescence, 106, 47-55.
http://dx.doi.org/10.1016/S0022-2313(03)00133-9

[5]   Andrzej, M.K., Stefan, L., Zbingniew, H., et al. (2000) Improvement of Emission Intensity in Luminescent Materials Based on the Antenna Effect. Journal of Alloys and Compounds, 300, 55-60.

[6]   Yang, J.H., Zhu, G.Y. and Wu, B. (1987) Enhanced Luminescence of the Europium/Terbium/Thenoyltrifluoroacetone/ 1,10-Phenanthroline/Surfactant System and Its Analytical Application. Analytica Chimica Acta, 198, 287-291.
http://dx.doi.org/10.1016/S0003-2670(00)85030-8

[7]   Zhang, R.J. and Yang, K.Z. (2000) Fluorescence Lifetime and Energy Transfer of Rare Earth β-Diketone Complexes in Organized Molecular Films. Thin Solid Films, 363, 275-278.
http://dx.doi.org/10.1016/S0040-6090(99)01004-4

[8]   Zhang, R.J., Liu, H.G., Zhang, C.R., et al. (1997) Influence of Several Compounds on the Fluorescence of Rare Earth Complexes Eu(TTA)3Phen and Sm(TTA)3Phen in LB Films. Thin Solid Films, 302, 223-230.
http://dx.doi.org/10.1016/S0040-6090(96)09562-4

[9]   Paniqrahi, B.S., Peter, S. and Viswanathan, K.S. (1997) Cofluorescence of Eu3+ in Complexes of Aromatic Carboxylic Acid. Spectrochimica Acta Part A, 53, 2579-2585.
http://dx.doi.org/10.1016/S1386-1425(97)00190-X

[10]   Maji, S. and Viswanathan, K.S. (2008) Ligand-Sensitized Fluorescence of Eu3+ Using Naphthalene Carboxylic Acids as Ligands. Journal of Luminescence, 128, 1255-1261.
http://dx.doi.org/10.1016/j.jlumin.2007.12.002

[11]   Zhao, G.H., Zhao, S.G., Gao, J.Z. and Kang, J.W. (1997) Sensitivity and Stability Induced by Cyclodextrin in the Fluorescence Analysis of Terbium(III) Ions Using Trimesic Acid. Bulletin des Societes Chimiques Belges, 106, 197-203.

[12]   Wang, Z.X., Shu, W.Y., Zhou, Z.C., Liu, Y.N. and Chen, H. (2003) Fluorescence Properties and Application of Doping Complexes Eu1xLx(TTA)3Phen as Light Conversion Agents. Journal of Central South University of Technology, 10, 342-346.
http://dx.doi.org/10.1007/s11771-003-0036-4

[13]   Yang, J.H., Ren, X.Z., Zhou, H.B. and Shi, R.P. (1990) Enhanced Luminescence of the Europium(III)-Dibenzoylmethane-Ammonia-Acetone System and Its Analytical Application to the Determination of Europium. Analyst, 115, 1505-1508.
http://dx.doi.org/10.1039/an9901501505

[14]   Li, W.L., Yu, G. and Huang, S.H. (1993) Enhancement Effects of Y(III)ion on Tb(III) Fluorescence in Tb(III)-Y(III)- Benzoic Acide Complexes. Journal Alloys and Compounds, 194, 19-22.
http://dx.doi.org/10.1016/0925-8388(93)90639-5

[15]   Panigrahi, B.S. (1999) Fluorescence and Cofluorescence Enhancement of Tb3+ and Eu3+ Using Phenyl Phosphonic and Phenyl Phosphinic Acida as Ligands. Journal of Luminesence, 82, 121-127.
http://dx.doi.org/10.1016/S0022-2313(99)00037-X

[16]   Zhao, G.H. and Zhao, J. (2003) Spectrofluorimtric Determination of Terbium(III) by Fluorescence Enhancement System of Tb3+-TPA-TritonX-100 by La3+. Rare Metals, 22, 112-116.

[17]   Yang, J.H., Zhu, G.Y. and Wang, H. (1989) Application of the Columinescence Effect of Rare Earth: Simulataneous Determination of Trace Amounts of Samarium and Europium in Solution. Analyst, 114, 1417-1419.
http://dx.doi.org/10.1039/an9891401417

[18]   Fu, Y.J., Wong, T.K.S., Yan, Y.K. and Hu, X. (2003) Syntheses, Structures and Luminescent Properties of Sm (III) and Eu (III) Chelates for Organic Electroluminescent Device Applications. Journal of Alloys and Compounds, 358, 235-244.
http://dx.doi.org/10.1016/S0925-8388(03)00047-1

[19]   Deacon, G.B. and Philips, R.J. (1980) Relationships between the Carbon-Oxygen Stretching Frequencies of Carboxylato Complexes and the Type of Carboxylate Coordination. Coordination Chemistry Reviews, 33, 227-250.
http://dx.doi.org/10.1016/S0010-8545(00)80455-5

[20]   Taylor, M.D., Carter, C.P. and Wynter, C.I. (1968) The Infrared Spectra and Structure of the Rare Earth Benzoates. Journal of Inorganic and Nuclear Chemistry, 30, 1503-1511.
http://dx.doi.org/10.1016/0022-1902(68)80290-8

[21]   Malta, O.L., Coutodos, S.M.A., Thompson, L.C. and Ito, N.K. (1996) Intensity Parameters of 4f-4f Transitions in the Eu(dipivaloylmethanate)3 1,10-phenanthroline Complex. Journal of Luminescence, 69, 77-84.
http://dx.doi.org/10.1016/0022-2313(96)00084-1

[22]   Panigrahi, B.S., Peter, S., Viswanathan, K.S. and Mathews, C.K. (1993) Fluorescence Enhancement and Cofluorescence in Complexes of Terbium, Dysprosium and Europium with Trimesic Acid. Analytica Chimica Acta, 282, 117-124.
http://dx.doi.org/10.1016/0003-2670(93)80359-S

 
 
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