Table 5.
Thermoanalytical results (TG and DTG) of Schiff base ligand (H2L) and its metal complexes.
|
Complex |
TG range (°C) |
DTGmax (°C) |
n* |
Mass loss Total mass loss Estim (Calcd) % |
Assignment |
Residues |
|---|---|---|---|---|---|---|
|
H2L |
30–330 330–900 |
195, 255 400 |
2 1 |
37.69 (37.25) 60.17 (62.75) 97.69 (100.00) |
‐ Loss of C10H21. ‐ Loss of C11N3O4. |
|
|
[Cr(H2L)(H2O)2 Cl]Cl2 ⋅ 2H2O |
30–120 120–900 |
66 218, 700, 810 |
1 3 |
5.64 (5.90) 69,70 (71.31) 75.34 (77.21) |
‐ Loss of 2H2O. ‐ Loss of 1.5Cl2, 2H2O and C16H22N3O2.5. |
1/2Cr2O3+5C |
|
[Mn(H2L)(H2O)2Cl]Cl ⋅ 2H2O |
30–375 375–900 |
71, 125, 155 379, 812 |
3 2 |
34.50 (34.81) 41.62 (42.43) 76.12 (77.24) |
‐ Loss of Cl2,4H2O, C4H10. ‐ Loss of C12H11N3O3. |
MnO+5C |
|
[Fe(H2L)(H2O)2Cl]Cl2 |
30–900 |
139, 204 |
2 |
78.15 (77.78) 78.15 (77.78) |
‐ Loss of 1.5Cl2, 2H2O and C17H21N3O2.5. |
1/2Fe2O3+4C |
|
[Ni(H2L)(H2O)]Cl2 ⋅ 4H2O |
30–250 250–900 |
73, 157 183, 424 |
2 2 |
27.29 (26.87) 50.91 (50.74) 78.2 (77.61) |
‐ Loss of 5H2O, Cl2. ‐ Loss of C16H21N3O3. |
NiO+5C |
|
[Cu(H2L)Cl]Cl ⋅ 2H2O |
30–135 135–900 |
68 169, 270, 550 |
1 3 |
6.56 (6.55) 69.02 (70.19) 75.58 (76.74) |
‐ Loss of 2H2O. ‐ Loss of Cl2, C17H21N3O3. |
CuO+4C |
|
[Zn(H2L)(H2O)Cl2] ⋅ 2H2O |
30–180 180–365 365–900 |
61, 155 178, 285 464, 800 |
2 2 2 |
9.47 (9.48) 19.77 (20.89) 43.44 (42.67) 72.68 (73.02) |
‐ Loss of 3H2O. ‐ Loss of Cl2, 3CH4 ‐ Loss of C12H9N3O3 |
ZnO+6C |
|
[Cd(H2L)(H2O)Cl2] |
30–160 160–245 245–480 480–900 |
132 217 268 561, 833 |
1 1 1 2 |
3.65 (3.10) 11.83 (12.22) 24.70 (24.45) 33.30 (32.03) 73.48 (71.80) |
‐ Loss of H2O. ‐ Loss of Cl2. ‐ Loss of C10H 21. ‐ Loss of C7N3O3. |
CdO+4C |
* n=number of decomposition steps.