Table 5: Thermogravimetric data of (HL) ligand and its Co(II), Ni(II), Cu(II), Zn(II), and Pd(II) complexes.


 Complex Decomp. step (°C) Mass loss (%)
Found (Calcd.)
MW loss Species eliminated Solid residue (%)
Found (Calcd.)
Found Calcd.

 [Co(L)2(H2O)2] 125–350 5.30 (5.25) 36 35.7 2H2O (CoO + 4C)
350–450 22.66 (22.64) 154 153.84 C10H4NO 18.09 (18.26)
450–647 10.89 (10.99) 74 74.68 C3H8NO
647–1,000 42.97 (42.86) 292 291.23 C15H8N4O3

 [Ni(L)2(H2O)2] 130–300 5.30 (5.281) 36 35.87 2H2O (NiO + 2C)
300–426 24.14 (24.219) 164 164.52 C9H10NO2 14.528 (14.50)
426–609 17.37 (17.50) 118 118.88 C6H2N2O
609–1,000 38.57 (38.50) 262 261.53 C15H8N3O2

 [Cu(L)(H2O)]CH3COO 216–477 38.87 (38.47) 166.14 C7H6N2O3 (CuO + 5C)
477–1,000 29.95 (29.41) 166.51 127.31 C6H9NO2 32.23 (32.12)

 [Zn(L)(H2O)]CH3COO 120–300 14.72 (14.68) 64 63.55 H2O + CH4NO (ZnO + 2C)
300–400 4.37 (4.382) 19 19.05 H3O 24.243 (24.21)
400–1,000 56.59 (56.79) 246 246.6 C15H6N2O2

 [Pd(HL)Cl2] 50–309 15.09 (15.159) 71 71.34 Cl2 (PdO2 + C)
309–454 28.69 (28.743) 135 135.265 C7H9N3 31.96 (31.514)
454–1,000 24.22 (24.584) 114 115.69 C8H2O