Novel pH responsive luminescent poly(oxyethylene phosphate) tris(β-diketonate) europium (III) complexes
Tóm tắt
The paper reports on the dependence of the absorbance and luminescent intensity from pH of novel poly(oxyethylene phosphate) tris(β-diketonate) europium (III) complexes. The photophysical data obtained allow some preliminary assumptions about the nature of this phenomenon. Increase in luminescent efficiency is a consequence of enhanced efficiency of energy transfer caused by structural changes in complexes after water deprotonation. Remarkable change has been observed in photophysical properties of the polymer complexes by studying the fluorescent emission and excitation spectra and absorption recorded at various pH both in solution and in the solid state. Some of the complexes derivative of the dibenzoylmethane (DBM) show more than hundred times increase in the luminescence after alkalization. The pH value, at which the maximum luminescent efficiency appears, depends on the type of the fourth ligand. The difference between luminescent efficiency of the complexes in alkaline and neutral environment depends on the β-diketonate ligands and on polymer type as well.
Tài liệu tham khảo
B. Timmer, W. Olthuis, A. van der Berg, Sensors and Actuators B 107, 666 (2005), DOI:10.1016/j.snb.2004.11.054
T. Gunnlaugsson, Tetrahedron Letters 42, 8901 (2001), DOI:10.1016/S0040-4039(01)01935-9
T. Gunnlaugsson, J. P. Leonard, K. Senechal, A. J. Harte, J. Am. Chem. Soc. 125, 12062 (2003), DOI: 10.1021/ja035425a
J. P. Leonard, C. M. G. dos Santos, S. E. Plush, T. McCabe, T. Gunnlaugsson, Chem. Commun. 129, 129 (2007), DOI: 10.1039/b611487c
C. P. Mccoy, F. Stomeo, S. E. Plush, T. Gunnlaugsson, Chem. Mater. 18, 4336 (2006), DOI: 10.1021/cm060603v
D. Parker, Coordin. Chem. Rev. 205, 109 (2000), DOI: 10.1016/S0010-8545(00)00241-1
R. Pal, D. Parker, Org.Biomol.Chem. 6, 1020 (2008), DOI: 10.1039/b718993a
J. P. Leonard, T. Gunnlaugsson, Journal of Fluorescence 15 (4), 585 (2005), DOI: 10.1007/s10895-005-2831-9
D. Parker, P. K. Senanayake J. A. G. Williams, J. Chem. Soc., Perkin Trans. 2, 2129 (1998), DOI: 10.1039/a801270i
Na Shao, J. Jin, G. Wang, Y. Zhang, R. Yang, J. Yuan, Chem. Commun., 1127 (2008), DOI: 10.1039/b715719c
S. Blair, M. P. Lowe, C. E. Mathieu, D. Parker, P. K. Senanayake, R. Kataky, Inorg. Chem. 40, 5860(2001), DOI: 10.1021/ic010371w
S. Salama, F. S. Richardson, J. Phys. Chem., 84, 512 (1980)
J. L. Kropp, M. W. Windsor, J. Chem. Phys., 39, 2769 (1969)
A. Beeby, I. M. Clarkson, R. S. Dickins, S. Faulkner, D. Parker, L. Royle, A. S. de Sousa, J. A. G. Williams, M. Woods, J. Chem.Soc., Perkin Trans. 2, 493 (1999), DOI: 10.1039/a808692c
Chun-Man Chan, Chun-Sing Fung, Kwok-Yin Wong, W. Lo, Analyst, 123, 1843 (1998), DOI: 10.1039/a802460j
M. H. W. Lam, D. Y. K. Lee, K. W. Man, C. S. W. Lau, J. Mater. Chem., 10, 1825 (2000), DOI: 10.1039/b001914n
K. Kossev, A. Vassilev, Y. Popova, I. Ivanov, K. Troev, Polymer 44 (2), 1987 (2003), doi:10.1016/S0032-3861(03)00081-8
J. Barnes, P. Holt, Makromol. Chem. 176, 275 (1975), DOI: 10.1002/macp.1975.021760203
R. Tsevi, P. Novakov, K. Troev, D. M. Roundhill, Journal of Polymer Science: Part A: Polymer Chemistry 35, 625 (1997)
J. Pretula, S. Penzek, Makromol. Chem. 191, 671 (1990), DOI: 10.1002/macp.1990.021910322
R. Tsevi, G. Todorova, K. Kossev, K. Troev, D. M. Roundhill, Makromol. Chem. 194, 3261 (1993)
R. Georgieva, R. Tsevi, K. Kossev, R. Kusheva, M. Balgjiska, R. Petrova, V. Tenchova, I. Gitsov, K. Troev, J. Med. Chem. 45, 5797 (2002), DOI: 10.1021/jm020309o
S. Stanimirov, A. Vasilev, E.T.K. Haupt, I. Petkov, T. Deligeorgiev, J. Fluorescence. In Press, DOI: 10.1007/s10895-008-0384-4
M. P. Lowe, D Parker, Inorg. Chem. Acta 317, 163 (2001), DOI: 10.1016/S0020-1693(01)00346-2
M. Woods, A. D. Sherry, Inorg. Chem. 42, 4401 (2003), DOI: 10.1021/ic0300823
Y. Hasegawa, E. Ishiwata, T. Ohnishi, G. R. Choppin, Anal. Chem. 71, 5060 (1999), DOI: 10.1021/ac990485d
I. Mamedov, A. Mishra, G. Angelovski, H. A. Mayer, Lars-Olof Pålsson, D. Parker, N. K. Logothetis, Dalton Trans., 5260 (2007), DOI: 10.1039/b711351j