ACCEPTED MANUSCRIPT
spectra were measured after waiting for 10min. In various pH ranges, metal complexes
showed absorption peaks at λ = 647, 649 and 510 nm, respectively. We observed that the
wavelength changed very little in the pH range 6~7; a pH value of 7 was chosen for all
experiments at 80-85 °C [17-20].
2.3. Synthesis of complexes
TP of 0.97 g (5 mmol) was dissolved in water. An aqueous solution of the
metal salt was added and placed in a magnetically-stirred 25 ml round bottom flask. This was
followed by the addition of an ethanolic solution (0.61 g, 5 mmol) of NA and an aqueous
solution (0.48 g, 5 mmnol) of KSCN at the molar ratio of 1:2:2:2 (M:NA:TP:KSCN). The pH
of the solution was adjusted to ~ 7 by adding 0.1 M NaOH in water and the system was
refluxed for two hours at 80-85 °C. The solid material obtained were washed in water,
recrystallized with ethanol:water mixture and dried. The yields were obtained between 70-85
%. All complexes were air stable and soluble only in organic solvents.
[Co(NA)2(TP)2(SCN)2].6H2O (1): Yield (%): 85. Color: Orange. M.P. (°C): 162. Elemental
Analysis (%): Calcd.: C 37.86, H 4.51, N 22.08, O 21.63, S 7.21, Co 6.71; Found: C 37.80, H
4.41, N 22.01, O 21.53, S 7.17, Co 6.68, FT-IR (cm-1): 3302.95 ν(NH), 2117.83 ν(SCN),
1666.84 ν(C=O), 1626.78 ν(C=N),1610.00 ν(C=C), 1251.62 ν(C-N), 714.06 ν(CS), 555.84
ν(M-N), 466.82, ν(MSCN). UV-Vis. 647, 388, 239. Magnetic Moment (BM): 4.55.
Conductivity (ꢁ-1cm2mol-1): 20.81. MS (m/z, EI): 888.0; Found: 887.54.
[Ni(NA)2(TP)2(SCN)2].6H2O (2): Yield (%): 82. Color: Blue. M.P. (°C): 210. Elemental
Analysis (%): Calcd.: C 37.85, H 4.51, N 22.08, O 21.63, S 7.21, Ni 6.74; Found: C 37.77, H
4.36, N 22.05, O 21.58, S 7.17, Ni 6.70. FT-IR (cm-1): 3304.50 ν(NH), 2117.82 ν(SCN),
1666.74 ν(C=O), 1627.66 ν(C=N), 1610.02 ν(C=C), 1250.48 ν(C-N), 714.16 ν(CS), 556.30
ν(M-N), 466.03 ν(MSCN). UV-Vis. (nm): 649, 389, 298. Magnetic Moment (BM): 3.40.
Conductivity (ꢁ-1cm2mol-1): 19.72. MS (m/z, EI): 888.10; Found: 887.77.
[Cu(NA)2(TP)2(SCN)2].2H2O (3): Yield (%): 75. Color: Yellow-Brown M.P. (°C): 285,
Elemental Analysis (%): Calcd.: C 40.96, H 3.90, N 23.89, O 15.60, S 7.80, Cu 7.84; Found:
C 40.91, H 3.78, N 23.85, O 15.54, S 7.75, Cu 7.79. FT-IR (cm-1): 3304.28 ν(NH), 2117.88
ν(SCN), 1667.78 ν(C=O), 1627.51 ν(C=N), 1609.98 ν(C=C), 1251.13 ν(C-N), 714.23 ν(CS),
555.54 ν(M-N), 466.89 ν(MSCN). UV-Vis. (nm): 510, 251. Magnetic Moment (BM): 2.30.
Conductivity (ꢁ-1cm2mol-1): 19.22. MS (m/z, EI): 821.00; Found: 820.33.