Paper
Dalton Transactions
Yield: 400 mg, 77%, Mp: 200–210 °C. FT-IR (KBr, cm−1):
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1107, 1244, 1468, 1501, 1619, 1691, 2333, 2359, 2850, 2922,
3170, 3323(broad, –OH). 1H NMR (DMSO-d6, 300 MHz):
δ (ppm): 13.75 (d, 1H, J = 5.07 Hz), 10.45 (s, 1H), 9.06 (d, 1H,
J = 10.17 Hz), 8.02 (d, 1H, J = 8.31 Hz), 7.75 (m, 2H), 7.62 (d,
1H, J = 7.89 Hz), 7.42 (t, 1H, J = 14.4 Hz), 7.19 (t, 1H, J = 14.07
Hz), 6.72 (d, 1H, J = 9.33 Hz), 4.63 (s, 2H). 13C NMR (DMSO-d6,
75 MHz): δ (ppm): 164.63, 158.30, 154.67, 140.26, 136.67,
136.22, 132.09, 129.67, 128.22, 127.25, 127.07, 123.95, 119.21,
112.78, 108.94, 55.29. HRMS (ESI-TOF) m/z: M+ calculated for
C31H25N5O4 is 531.1907; found: 532.1094 (M + H)+. Elemental
analysis: calculated value: C, 70.04; H, 4.74; N, 13.18. Observed
value: C, 70.16; H, 4.67; N, 13.13%.
Synthesis of the SPHN–Zn complex (Receptor 1). The Zn2+
complex of the SPHN was synthesized by adding the SPHN
(300 mg, 0.808 mmol) to a methanol solution of ZnCl2
(303 mg, 0.807 mmol) and the whole mixture was stirred for
30 minutes. The solvent was removed under vacuum and
recrystallized by dissolving in dry ethanol and the whole mass
was washed with diethyl ether several times. Finally a greenish
white solid was obtained (200 mg, 60%) and characterized
by mass spectrometry (ESI-TOF) and IR analysis (ESI†).
FT-IR (KBr, cm−1): 1155, 1263, 1468, 1501, 1619, 1691,
2333, 2359, 2850, 2900, 3170. HRMS (ESI-TOF) m/z: M+ calcu-
lated for C31H21N5O4Zn2 is 655.0176; found: 656.0172. Elemen-
tal analysis: calculated value: C, 56.56; H, 3.22; N, 10.64.
Observed value: C, 56.52; H, 3.24; N, 10.66%.
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Acknowledgements
The authors thank the DST and CSIR (Govt of India) for 10 (a) M. J. Kim, K. M. K. Swamy, K. M. Lee, A. R. Jagdale,
financial support. A.K.D., B.P., S.R. and A.K.M. acknowledge
the CSIR for providing fellowships.
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