Table 3 Thermal decomposition steps, mass loss (%), proposed lost segments, final residue thermo-kinetic activation parameters of each decomposition step for the prepared complexes in an N2 atmosphere, at a heating rate of 5 °C / min.

From: Synthesis and biological evaluation of ibuprofen/o-vanillin Schiff base complexes with anti-inflammatory, anti-proliferative and anti-SARS-COV-19 activities

Complexes

Temperature oC

Fragment loss %

Weight loss %

E* [KJmol-1]

A [S-1]

∆H* [Jmol-1]

∆G* [KJmol-1]

∆S* [Jmol-1K-1]

Lost form

M. Wt

Found

Calc

CuL

44–429 °C

H2O coord + CH3 + Cl

68.5

13.47

13.42

8.2

17.2

4223.8

23,300.9

-4163

430–803 °C

C19H14N2O3

318

62.78

62.91

5250.26

26,527.3

-51.75

804–999 °C

1/2C + 4H2

14

2.75

2.77

7404.67

40,349.5

-52.1

\(>999 ^\circ \text{C}\)

Cu + 1/2C

69.5

13.93

13.75

7416.67

41,349.5

-53.1

NiL

46–268 °C

2H2O hyd + H2O coord. + NO3 + 3H2

122

23.19

23.11

2.3

3.1

3621

19,421

-53.94

269–593 °C

C19H8O2N2

296

56.05

56.06

4832

25,231

-50.196

594–995 °C

C2H11O

51

9.42

9.66

8721

46,021

-51.8675

\(>995 ^\circ \text{C}\)

Ni

58.69

11.34

11.12

1100

5782

-55.25

ZnL

44–360 °C

3H2O coord + NO3 + C6H12O

216

40.31

40.38

6.2

8.3

4301

24,002

-55.93

6203

5531

-54.18

360–718 °C

C11N2O2

192

36.16

35.9

2438

12,321

-54

719–999 °C

C4H13

61

11.91

11.4

6236

44,521

-54

\(>999\) °C

Zn

65.4

11.63

12.2

6660

45,521

-54.21

VOL

45–215 °C

H2O coord + C2H5 + 3H2

53

11

10.96

8.2

17.2

4423.8

23,326.9

-5163

215–515 °C

C9H7N2O

159

32.84

32.89

5250.26

26,527.3

-51.75

516–708 °C

C8H5O2

133

27.85

27.5

7404.67

40,349.5

-52.1

709–978 °C

C4H7O

71

15.38

14.8

7416.67

41,349.5

-53.1

\(>978 ^\circ \text{C}\)

VO

66.9

12.93

13.8

3621

19,421

-53.94