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1H), 7.44–7.40 (m, 1H), 7.13–7.11 (d, J ¼ 8.0 Hz, 1H), 7.01–6.97
(m, 1H), 4.47–4.42 (m, 2H), 1.46–1.43 (m, 3H). MALDI-TOF-
MS (m/z): 299 [M]+.
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General procedure for synthesis of the zinc complexes (1–5). A
solution of zinc acetate (0.49 mmol) in ethanol (2 mL) was added
dropwise to a solution of ligands 1a–5a (1 mmol) in dried ethanol
(10 mL) at 40 ꢀC. The resulting mixture was stirred at 70 ꢀC for
24 h. The yellow or green precipitate was collected by filtration
and washed with ethanol. The zinc complexes were all purified by
vacuum sublimation.
1: Yield 81%. MALDI-TOF-MS (m/z): 576.0 [M]+. Anal. calcd
for C28H20N2O4S2Zn: C, 58.18; H, 3.49; N, 4.85. Found: C,
58.35; H, 3.52; N, 4.62.
2: Yield 80%. MALDI-TOF-MS (m/z): 567.0 [M + Na]+. Anal.
calcd for C28H20N2O2S2Zn: C, 61.59; H, 3.69; N, 5.13. Found: C,
61.38; H, 3.83; N, 5.26.
3: Yield 57%. MALDI-TOF-MS (m/z): 551.9 [M]+. Anal. calcd
for C26H14F2N2O2S2Zn: C, 56.37; H, 2.55; N, 5.06. Found: C,
56.54; H, 2.37; N, 5.30.
4: Yield 62%. MALDI-TOF-MS (m/z): 651.9 [M]ꢁ. Anal.
calcd for C28H14F6N2O2S2Zn: C, 51.43; H, 2.16; N, 4.28. Found:
C, 51.55; H, 1.98; N, 4.47.
5: Yield 69%. MALDI-TOF-MS (m/z): 660.0 [M]+. Anal. calcd
for C32H24N2O6S2Zn: C, 58.05; H, 3.65; N, 4.23. Found: C,
58.26; H, 3.54; N, 4.12.
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Acknowledgements
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We thank the National Natural Science Foundation of China
(21072026, 20923006, and U0634003), the Ministry of Education
for the New Century Excellent Talents in University (Grant
NCET-08-0074), and the Fundamental Research Funds for the
Central Universities (DUT12ZD211) for financial support of this
work.
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