Complex

Type

T_m

(˚C)

E_a

kJ mol⁻¹

N

a_m

DS^#

kJ K⁻¹ mol⁻¹

DH^#

kJ mol⁻¹

Z

S⁻¹

Temp. (˚C)

TGA

Wt. loss%

Assignment

Calc.

Found

Tylosin (TYS)

Endo.

356.6

20.109

1.58

0.54

−0.28

−23.65

0.28

46.8 - 200.0

11.63

11.65

- Loss of 6.7 mole of outer sphere H₂O.

Exo.

785.4

19.226

0.89

0.65

−0.31

−160.61

0.004

200.0 - 659.8

88.37

88.35

- Assigned to removal of NO₂

- Decomposition of the rest bulky molecule of ligand

[Ni₂(TYS)₂Cl₂(H₂O)₄]·28.8H₂O

Endo.

403.0

14.170

1.46

0.56

−0.29

−38.11

0.013

79.8 - 248.0

19.88

20.14

- Expected for Dehydration of almost 28.8H₂O molecules

Exo.

611.3

38.827

1.40

0.56

−0.30

−101.73

0.013

248.0 - 696.6

72.55

72.04

- Elimination of coordinated 4H₂O and the bulky molecule of ligand with 2NO₂

- Assigned to formation 2NiO + 2C

[Cr₂(TYS)₂Cl₄(H₂O)₂]·27H₂O

Endo.

389.0

12.198

1.38

0.57

−0.29

−33.93

0.012

46.0 - 184.1

18.71

18.40

- Dehydration of almost 27H₂O molecules

Exo.

578.8

32.903

1.02

0.62

−0.30

−91.86

0.012

184.1 - 345.4

39.43

39.50

- Assigned to removal of 2NO₂, two coordinated H₂O and two molecules of Cl₂.

- Loss of C₄₆H₇₃O₈ of the bulky molecule of ligand.

Exo.

697.2

92.863

1.71

0.52

−0.29

−126.08

0.026

345.4 - 694.9

35.12

35.38

- Elimination of the bulky molecule of ligand with formation of Cr₂O₃ + 2C