Table 4: Thermoanalytical results (TG and DTG) of ML, FL complexes 1–6.


Compound Temp. range (°C) % Mass loss found (calcd.) Assignment

1 250–330 41.7 (42.7) – The loss of 4-methoxybenzene + 2CO
[Cr(CO)4ML] 330–450 27.92 (29) – The loss of 4-amino-4-oxobut-2-enoic acid

2 130–180 22.44 (21.57) – The loss of OH3C−C6H5
[Mo(CO)4ML] 180–435 13.05 (12.18) – The loss of HO−CH2−CH2−NH2

3 131–280 34.6 (37.32) – The loss of ML maleanilic acid ligand
[W(CO)4ML] 280–350 4.33 (4.74) – The loss of CO group
350–589 4.64 (4.74) – The loss of CO group

4 131.9–395.8 32.69 (30) – The loss of p-fluoroaniline
[Cr(CO)4FL] 399–509 28.65 (26.8) – The loss of (Z)-4-oxobut-2-enoic acid
5 140.7–233.3 2.9 (3.8) – The loss of fluorine
[Mo(CO)4FL] 233.3–431.3 37.76 (38.78) – The loss of maleanilic acid ligand

6 141–336 16.83 (17.81) – The loss of p-fluoroaniline
[W(CO)4FL] 337–598 12.27 (9.88) – The loss of (Z)-4-oxobut-2-enoic acid