Research Article
Preparation and Characterization of Di-, Tri-, and Tetranuclear Schiff Base Complexes Derived from Diamines and 3,4-Dihydroxybenzaldehyde
Table 6
Thermal decomposition of the copper complexes (C8 and C12).
| C8 stable phase MPD(Co3(bipy)3(H2O)4Cl2 Et3N
M.wt = 1260.7 | Temp. range of decomp. °C
| Weight % loss
found (calc.) |
| | 0.45Et3N + Cl + 2H2O | 78–211
| 9.00 (9.28) | | 0.55Et3N + 2H2O | 212–423 | 6.80 (7.26) | | 2CH3 + 2bipy + C6H2 | 424–661 | 32.4 (33.43) | | Cl + bipy + HCN | 662–998 | 17.23 (17.33) | | C7H4NO2Co2 + C6H4O2Co (residue) | — | 34.57 (33.13) |
| C12 stable phase ED(Cu4(bipy)2(H2O)6Cl4 3H2O
M.wt = 1166.16 | Temp. range of decomp. °C | Weight % loss
found (calc.) |
| | 4H2O | 73–261 | 5.80 (6.17) | | 5H2O + C2H4 | 262–365 | 10.20 (10.11) | | C5H4N + bipy | 366–542 | 20.00 (19.46) | | 4Cl | 543–761 | 11.8 (12.13) | | C5H4N | 762–998 | 6.4 (6.68) | | C14H8N2O4Cu4 (residue) | — | 45.79 (44.76) |
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