656 Zhang et al.
Asian J. Chem.
TABLE-3
UV-VISIBLE SPECTRAL DATA FOR THE bis(SALAMO)-TYPE LIGAND H4L AND ITS METAL COMPLEXES
C
First band
Second band
Third band
max3 (nm)
Compoune
(×10-5 mol L-1)
λmax1 (nm)
λmax2 (nm)
λ
H4L
2.50
2.50
2.50
2.50
273
283
270
262
304
304
322
327
318
318
-
[Cu3(L)(OAc)2(H2O)]
[Zn3(L)(OAc)2(H2O)]
[Zn2Eu(L)(OAc)3(H2O)]
-
stretching bands, respectively8. These bands are not present in
that of the free ligand H4L.
Funds for the Gansu Province Universities (212086) and the
science and technology support funds of Lanzhou Jiaotong
University (ZC2012003), which are gratefully acknowledged.
UV-visible spectra: The UV-visible spectral data of the
bis(salamo)-type ligand H4L and its three Cu2+, Zn2+ and
Zn2+-Eu3+ complexes in 2.5 × 10-5 mol L-1 chloroform solution
are presented in Table-3.
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The bis(salamo)-type ligand H4L exhibits three intense
peaks at around 273, 304 and 318 nm. The former absorption
peak at about 273 nm can be assigned to the π-π* transition of
the benzene rings, while the middle peak at 304 nm can be
attributed to the intra-ligand π-π* transition of the C=N bonds
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transition of the substitutional group to benzene rings8,15. Upon
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peak of 273 nm with moderate bathochromic or hypochromatic
shifts and the band at 304 nm only show a bathochromic shift
of the peak extending to 304-327 nm15.
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Conclusion
A novel bis(salamo)-type chelating ligand H4L and its
Cu2+, Zn2+ and Zn2+-Eu3+ complexes have been designed and
synthesized, respectively and characterized by elemental
analyses, IR and UV-visible spectra. The most likely structures
of the Cu2+, Zn2+ and Zn2+-Eu3+ complexes have been suggested.
O
O
N
N
O
O
O
N
N
O
O
M
M1
O
O
O
O
O
O
OEt
OEt
OEt
M2 OH2
OEt
M
OH2
O
O
O
O
O
O
O
O
M
M1
O
N
N
N
O
10. S.Akine, T. Taniguchi and T. Nabeshima, Tetrahedron Lett., 42, 8861 (2001).
11. S. Akine, T. Taniguchi and T. Nabeshima, J. Am. Chem. Soc., 128,
15765 (2006).
N
O
O
O
12. S. Akine, T. Taniguchi and T. Nabeshima, Inorg. Chem., 43, 6142 (2004).
13. S. Akine, T. Taniguchi and T. Nabeshima, Angew. Chem. Int. Ed., 41,
4670 (2002).
M = Cu2+ or Zn2+
M1 = Zn2+, M2 = Eu3+
14. W.J. Geary, Coord. Chem. Rev., 7, 81 (1971).
15. H.E. Smith, Chem. Rev., 83, 359 (1983).
ACKNOWLEDGEMENTS
This work was supported by the National Natural Science
Foundation of China (21361015), the Fundamental Research