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Proceedings of the Estonian Academy of Sciences

ISSN 1736-7530 (electronic)   ISSN 1736-6046 (print)
Formerly: Proceedings of the Estonian Academy of Sciences, series Physics & Mathematics and  Chemistry
Published since 1952

Proceedings of the Estonian Academy of Sciences

ISSN 1736-7530 (electronic)   ISSN 1736-6046 (print)
Formerly: Proceedings of the Estonian Academy of Sciences, series Physics & Mathematics and  Chemistry
Published since 1952
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Study of thermal and optical properties of dibenzoylmethane Eu(III) organic complexes; pp. 493–500

(Full article in PDF format) https://doi.org/10.3176/proc.2017.4.11


Authors

Ilze Malina, Nikolajs Juhnevics, Valdis Kampars

Abstract

Two Europium(III) organic complexes (ternary complex Eu(DBM)3(PHEN) and tetrakis complex [Eu(DBM)4]N(Et)4, where DBM is dibenzoylmethane and PHEN is 1,10-phenantroline) were synthesized and their structures proven with 1H-NMR spectroscopy, elemental analysis, FT-IR and mass spectroscopy. Their photophysical properties have been investigated in solution, solid-state and in poly-N-vinylcarbazole (PVK) films varying complex composition from 1 to 15 wt%. Both complexes exhibit intense UV light absorption and bright red-light emission with maximum wave length at 612 nm. It was shown that tetrakis complex in solution, solid-state and PVK films have enhanced photoluminescence properties compared to ternary complex due to four DBM molecules in Eu3+ coordination sphere, which leads to more effective excited energy transfer to Eu3+ ion. In THF solutions both complexes are characterized with low photoluminescence quantum yields (4% and 6%), in PVK films – moderate quantum yields (14–48%), but in solid state with high quantum yields (56% and 75%). Thermal properties for pure complexes and their PVK films were studied with thermogravimetric analysis. Both complexes exhibit high thermal degradation temperatures of 304 °C for ternary and 267 °C for tetrakis complex, but their PVK films show even higher degradation temperature (over 370 °C).

Keywords

optical materials, europium, dibenzoylmethane ligands, luminescence, Poly-N-vinylcarbazole films.

References

   1. Binnemans , K. Lanthanide-Based Luminescent Hybrid Materials. Chem. Rev. , 2009 , 109 , 4283–4374.
https://doi.org/10.1021/cr8003983

   2. Singh , A. K. , Singh , S. K. , Mishra , H. , Prakash , R. , and Rai , S. B. Structural , Thermal , and Fluorescence Properties of Eu(DBM)3PhenxComplex Doped in PMMA. J. Phys. Chem. B , 2010 , 114 , 13042–13051.
https://doi.org/10.1021/jp1050063

   3. Liang , H. , Xie , F. , Liu , M. , Jin , Z. , Luo , F. , and Zhang , Z. Luminescence studies of europium chelates with increasing benzene ring substituents ligand-doped polymer. Spectrochim. Acta , Part A , 2008 , 71 , 588–591.
https://doi.org/10.1016/j.saa.2008.01.017

   4. Ma , D.-G. , Wang , D.-K. , Hong , Z.-Y. , Zhao , X.-J. , Jing , X.-B. , Song , F. , et. al. Bright red electroluminescent devices based on a soluble lanthanide complex Eu(DBM)3(phen). Chin. J.Chem. , 1998 , 16(1) , 1–6.

   5. Santos , G. , Fonseca , F. J. , and Andrade , A. M. The dependence of OLED external efficiency on the mass concentration of europium(III) dispersed in PVK. ECS Trans. , 2011 , 39(1) , 475–480.
https://doi.org/10.1149/1.3615229

   6. Mech , A. , Karbowiak , M. , Görller-Walrand , C. , and Van Deun , R. The luminescence properties of three tetrakis dibenzoyl­methaneeuropium(III) complexes with different counter ions. J. Alloys Compd. , 2008 , 451 , 215–219.
https://doi.org/10.1016/j.jallcom.2007.05.019

   7. Malba , C. M. , Enrichi , F. , Facchina , M. , Demitric , N. , Plaisier , J. R. , Natile , M. M. , Selva , M. , Riello , P. , Perosa , A. , and Benedetti , A. Phosphonium-based tetrakis dibenzoylmethane Eu(III) and Sm(III) complexes: synthesis , crystal structure and photoluminescence properties in a weakly coordinating phosphonium ionic liquid. RSC Adv. , 2015 , 5 , 60898–60907.
https://doi.org/10.1039/C5RA03947A

   8. Zhou , D. , Huang , C. , Yaong , G. , Bai , J. , and Li , T. Luminescent europium-dibenzoylmethane complexes and their Langmuir–Blodgett films , J. Alloys Compd. ,1996 , 235 , 156–162.
https://doi.org/10.1016/0925-8388(95)02159-0

   9. Zawadiak , J. and Mrzyczek , M. Influence of substituent on UV absorption and keto–enol tautomerism equilibrium of dibenzoylmethane derivatives. Spectrochim. Acta Part A Mol. Biomol. Spectrosc. , 2012 , 96 , 815–819.
https://doi.org/10.1016/j.saa.2012.07.109

10. Wang , D. , Zheng , C. , Fan , L. , Zheng , J. , and Wei , X. Preparation and fluorescent properties of europium(III) complexes with b-diketone ligand and 1 ,10-phenantroline. Synth. Met. , 2012 , 162 , 2063–2068.
https://doi.org/10.1016/j.synthmet.2012.10.014

11. Biju , S. , Xu , L.-J. , Sun , C.-Z. , and Chen , Z.-N. White OLEDs based on a novel EuIII-tetrakis-b-diketonate doped into 4 ,4’-N ,N’-dicarbazlebiphenyl as emitting material. J. Mater. Chem. C , 2015 , 3 , 5775–5782.
https://doi.org/10.1039/C5TC00638D

12. Biju , S. , Freire , R. O. , Eom , Y. K. , Scopelliti , R. , Bunzli , J.-C.G. , and Kim , H. K. A EuIII tetrakis (b-diketonate) dimeric complex: photophysical properties , structural elucidation by sparkle/AM1 calculations , and doping into PMMA films and nanowires. Inorg. Chem. , 2014 , 53 , 84078417.
https://doi.org/10.1021/ic500966z

13. Li , W. , Yan , P. , Hou , G. , Li , H. , and Li , G. Efficient red emission from PMMA films doped with 5 ,6-DTFI europium(III) complexes: synthesis , structure and photophysical properties. Dalton Trans. , 2013 , 42 , 1153711547.
https://doi.org/10.1039/c3dt50580d

14. Ma , Q. , Zheng , Y. , Armaroli , N. , Bolognesi , M. , and Accorsi , G. Synthesis and photoluminescence properties of asymmetrical europium(III) complexes involving carbazole , phenanthroline and bathophenanthroline units. Inorg. Chem. Acta , 2009 , 362 , 3181–3186.
https://doi.org/10.1016/j.ica.2009.02.014

15.  Yu , G. , Liu , Y. , Wu , X. , and Zhu , D. Soluble europium complexes for light-emitting diodes. Chem. Mater. , 2000 , 12 , 2537–2541.
https://doi.org/10.1021/cm9904537

16. Deichmann , V. A. F. , Novo , J. B. M. , Cirpan , A. , Karasz , F. E. , and Akcelrud , L. Photo- and electroluminescent behaviour of Eu3+ ions in blends with poly(vinyl-carbazole). J. Braz. Chem. Soc. , 2007 , 18(2) , 330336.
https://doi.org/10.1590/S0103-50532007000200013

17. Raj , D. B. A. , Francis , B. , Reddy , M. L. P. , Butorac , R. R. , Lynch , V. M. , and Cowley , A. H. Highly luminescent poly(methyl methacrylate)-incorporated europium complex supported by a carbazole-based fluorinated β-diketonate ligand and a 4 ,5-bis(diphenylphosphino)-9 ,9-dimethylxanthene oxide co-ligand. Inorg. Chem. , 2010 , 49 , 9055–9063.
https://doi.org/10.1021/ic1015324

18. Forster , P. L. , Parra , D. F. , Lugao , A. B. , Kai , J. , and Brito , H. F. Highly luminescent polycaprolactone films doped with diaquatris (thenoyltrifluoroacetonate) europium(III) complex. J. Lumin. , 2015 , 167 , 85–90.
https://doi.org/10.1016/j.jlumin.2015.05.041

 

 
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Current Issue: Vol. 67, Issue 3 in Press, 2018




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