136
M.S. Refat et al. / Journal of Molecular Structure 980 (2010) 124–136
Table 6
Kinetic parameters of SZ, ½ðSZÞ2ꢀIþ ꢁ I3ꢂ, [(SZ)(DDQ)], [(SZ)(CHL)] and [(SZ)(PA)] CT-complexes.
Method
n
Parameter
r
E (kJ molꢂ1
)
Z (sꢂ1
)
D
S (J molꢂ1 Kꢂ1
)
D
H (kJ molꢂ1
)
D )
G (kJ molꢂ1
SZ
HM
CR
1
1
137
35.6
1.17 ꢃ 1011
ꢂ37.9
ꢂ229
133
31.2
153
153
0.9740
0.9693
11.9
½ðSZÞ2ꢀIþ ꢁ Iꢂ3
HM
CR
2
2
53.7
42.4
431
61.9
ꢂ199
ꢂ215
49.3
38
156
153
0.9555
0.9776
[(SZ)(DDQ)]
HM
CR
3
3
48.6
58.1
114
2270
ꢂ2.11
ꢂ186
44.1
53.6
158
154
0.9912
0.972
[(SZ)(CHL)]
HM
CR
1
1
125
147
5.22 ꢃ 1012
1.44 ꢃ 1015
ꢂ4.98
ꢂ41.7
121
143
124
124
0.9947
0.9931
[(SZ)(PA)]
HM
CR
2
2
88.9
107
2.69 ꢃ 107
2.51 ꢃ 109
ꢂ107
ꢂ69.2
84.8
102
138
137
0.9927
0.9943
n = Number of decomposition steps.
ꢂ lnð1ꢂ
a
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A plot of ln½
Þꢀ against 1/T was found to be linear Figs. 7A–
T2
7E, from the slope of which E, was calculated and Z can be deduced
from the intercept. The enthalpy of activation,
DH, and the free en-
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thalpy of activation, G, can be calculated via the equations:
D
D
H ¼ E ꢂ RTm; G ¼ H ꢂ TmD
D
D
S
ð14Þ
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satisfactory values of correlation coefficients (ꢇ1) in all cases indi-
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iodine (I2), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ),
p-chloranil (CHL) or picric acid (PA) were investigated in solid and
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physical measurements like formation constant (KCT), molar extinc-
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eCT), standard free energy (
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Appendix A. Supplementary material
Supplementary data associated with this article can be found, in
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