Research Article
Hydrazine Complexes of Lanthanides with 3-Acetoxy- and 4-Acetoxybenzoic Acids: Spectroscopic, Thermal, and XRD Studies
Table 4
Thermal data of lanthanide complexes of 3-abH and 4-abH.
| | Complex | DTA Temp (◦C) | Thermo gravimetry |
Nature of the reaction | | Temp. Range (◦C) | Weight Loss % | | Obsd. | Calcd. |
| | [La(3-ab)3(N2H4)2] | 180.0 (−) | 60–120 | 8.5 | 8.6 | Dehydrazination | | 406.0 (−) s | | | | | | 510.0 (−) b | 120–700 | 78.1 | 78.0 | Decomposition to metal oxide | | 640.0 (−) | | | | |
| | [Ce(3-ab)3(N2H4)2] | 191.4 (−) | 120–200 | | | | | 226.0 (−) d | 200–280 | 8.5 | 8.6 | Dehydrazination | | 437.0 (−) s | 280–600 | 76.5 | 76.7 | Decomposition to metal oxide |
| | [Pr(3-ab)3(N2H4)2] | 190.0 (−) s | 150–195 | 8.7 | 8.6 | Dehydrazination | | 200.0 (−) | 195–700 | 77.0 | 77.0 | Decomposition to metal oxide | | 289.0 (−) | | 477.0 (−) s |
| | [Nd(3-ab)3(N2H4)2]·H2O | 40.0 (+) | 30–100 | 2.2 | 2.4 | Dehydration | | 197.4 (−) s | 100–200 | 10.6 | 10.7 | Dehydrazination | | 248.6 (−) b | 200–700 | 78.0 | 77.9 | Decomposition to metal oxide | | 474.3 (−) s |
| | [Sm(3-ab)3(N2H4)2]·H2O | 45.0 (+) | 30–100 | 2.4 | 2.3 | Dehydration | | 186.0 (−) | 100–190 | 10.5 | 10.6 | Dehydrazination | | 240.0 (−) b | 190–700 | 77.4 | 77.3 | Formation of metal oxide | | 480.0 (−) s |
| | [Gd(3-ab)3(N2H4)2] | 186.0 (−) | 160–210 | 8.5 | 8.4 | Dehydrazination | | 226.0 (−) d | 210–700 | 76.2 | 76.1 | Decomposition to metal oxide | | 320.0 (−) | | 474.2 (−) s |
| | [La(4-ab)3(N2H4)]·H2O | 60.3 (+) | 40–100 | 2.3 | 2.5 | Dehydration | | 166.0 (−) | 100–180 | 6.9 | 6.9 | Dehydrazination | | 247.0 (−) s | 180–265 | 62.1 | 62.0 | Formation of metal carbonate | | 323.0 (−) | | 475.1 (−) | 265–700 | 77.2 | 77.6 | Decomposition to metal oxide | | 543.0 (−) b |
| | [Ce(4-ab)3(N2H4)]·H2O | 50.0 (+) b | 80–190 | 2.3 | 2.5 | Dehydration | | 225.0 (−) | 190–700 | 76.1 | 76.3 | Decomposition to metal oxide | | 323.0 (−) s | | 418.0 (−) | | 490.0 (−) b |
| | [Pr(4-ab)3(N2H4)]·H2O | 71.2 (+) | 40–100 | 2.6 | 2.5 | Dehydration | | 167.0 (−) | 100–175 | 7.0 | 6.9 | Dehydrazination | | 200.0 (−) | 175–440(−) | 61.5 | 61.4 | Formation of metal carbonate | | 275.0 | | 475.0 (−) | 440–700 | 76.9 | 76.7 | Decomposition to metal oxide | | 541.8 (−) s |
| | [Nd(4-ab)3(N2H4)]·H2O | 60.5 (+) | 40–100 | 2.3 | 2.5 | Dehydration | | 167.2 (−) | 100–190 | 6.9 | 6.8 | Dehydrazination | | 205.0 (−) | 190–700 | 77.2 | 77.0 | | | 247.0 (−) | Decomposition to metal oxide | | 387.0 (−) | | 540.2 (−) s |
| | [Sm(4-ab)3(N2H4)]·H2O | 62.4 (+) | 40–150 | 2.5 | 2.4 | Dehydration | | 175.3 (−) | 150–200 | 6.7 | 6.8 | Dehydrazination | | 213.2 (−) | 200–700 | 76.3 | 76.4 | | | 247.0 (−) | Decomposition to metal oxide | | 481.3 (+) | | 550.0 (−) b | |
| | [Gd(4-ab)3(N2H4)]·H2O | 63.2 (+) | 40–150 | 2.2 | 2.4 | Dehydration | | 178.0 (−) | 150–700 | 75.7 | 75.5 | Decomposition to metal oxide | | 275.0 (−) | | 448.1 (−) | | 549.0 (−) |
|
|
(+): endo, (−): exo, s: singlet, d: doublet, b: broad.
|
