A. Rotondo et al. / Polyhedron 45 (2012) 23–29
29
Table 5
Activation free energy for C–N rotation (
D
G# in kJ/mol), at coalescence temperature (range 250–340 K), for compounds 1–5, 1a–5a and 1b–5b.
Mono alkyl compounds
1
–
–
54 (275 K)
1
1
2
2
2
3
3
3
a
b
–
–
–
–
59 (305 K)
59 (310 K)
47 (236 K)
–
64 (316 K)
68 (328 K)
68 (315–330 K)
64 (320 K)
67 (335 K)
67 (338 K)
57 (305 K)
60 (308 K)
60 (305)
55(270 K)
60 (308 K)
60 (310 K)
a
b
–
48(247 K)
–
–
a
b
Dialkyl compounds
4
53 (275 K)
64 (318 K)
64 (320 K)
55 (285 K)
63 (316 K)
64 (324 K)
–
–
–
–
–
–
–
–
–
–
–
–
4
4
5
5
5
a
b
a
b
Coalescence temperatures in brackets. The
D
G# values measured by different coalescences show weak temperature dependence.
[
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Table 6
[
[
Equivalent conductivity (Ohm cm2 mol ) for the studied complexes in CH
ꢀ
1
ꢀ1
OH.
3
1
Complex
Molar concentration
Equivalent conductivity
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ꢀ3
ꢀ3
ꢀ3
ꢀ3
ꢀ3
ꢀ3
ꢀ3
ꢀ3
ꢀ3
ꢀ3
1a
1b
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1.28 ꢁ 10
1.25 ꢁ 10
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1.08 ꢁ 10
1.11 ꢁ 10
1.07 ꢁ 10
1.06 ꢁ 10
159.4
167.6
149.1
158.3
162.8
151.0
132.8
151.0
128.2
148.0
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Acknowledgement
We are grateful to ‘‘Il Ministero della Ricerca Scientifica’’ for the
financial support of our research programs.
(
4
Appendix A. Supplementary data
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The supplementary material reports variable temperature
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