Abstract
The interaction of iodine as a σ-acceptor with two derivatives of polyamidoamine dendrimers (donor), 1,8-naphthalimide polyamidoamine (PAM1) and 4-piperidino-1,8-naphthalimide polyamidoamine (PAM2) have been investigated spectrophotometrically at room temperature in chloroform. The results indicate the formation of two CT-complexes [(PAM1)I]
+I
3
− and [(PAM2)
2I]
+I
3
− with molar ratios of 1:2 and 1:1, respectively. The formation of these two complexes are in good agreement with their elemental analysis, infrared measurements and photometric titration plots based on the characteristic absorption bands of I
3
− ion around 280 and 360
nm. Moreover the formation of triiodide ion, I
3
−, in both of the two complexes was supported by measuring their spectra in the far-infrared region. Three characteristic bands are observed at 125, 110 and 75
cm
−1 due to
ν
as(I–I),
ν
s(I–I) and
δ(I
3
−), respectively, with C
2v symmetry.