M.S. Refat et al. / Spectrochimica Acta Part A 64 (2006) 435–441
441
Table 3
Spectrophotometric results of CT-complexes of [(DCN1)I]+·I3 and [(DCN2) I]+·I3 in CHCl3
−
−
Complexes
K
λmax [nm]
εmax
−
[(DCN1)I]+·I3
0.318 × 108 l mol−1
290
310
22.00 × 104 l mol−1 cm−1
−
[(DCN2) I]+·I3
0.324 × 108 l mol−1
21.56 × 104 l mol−1 cm−1
−
The infrar−ed spectra of the [(DCN1)I]+·I3
and
References
[(DCN2)I]+·I3 complexes and the free bases DCN1 and
DCN2 are recorded and shown in Fig. 6. However, the spectra
of [(DCN1)I]+·I3− and [(DCN2)I]+·I3− complexes are quite
similar to those of the free donors, but with some changes
in their band intensities and shifts of some band frequency
values like ν(C O), ν(C C) and (C–H). The infrared band
intensities of the free bases (DCN1) and (DCN2) are in gen-
eral relatively higher than those associated with the infrared
bands of their iodine complexes. This may indicate that, the
symmetry of the DCN1 and DCN2 are increased upon com-
plexation with iodine implying a smaller change in the dipole
moment during the bases vibration in the two complexes form
and hence, it show relatively weaker band intensities.
Finally, the formation of these two complexes upon the
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Two N,Nꢀ-bis-alkyl-1,4,6,8-naphthalenediimide have
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Acknowledgments
This work was particularly supported (IG GI and JMC)
by the bilateral academic cooperation between Bulgarian
Academy of Sciences and the National Scientific Fund of
France (CNRS).
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