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Resonance Raman and far infrared spectroscopic studies of triiodide complexes formed in the reaction of iodine with some polycyclic amines

1989; Pergamon Press; Volume: 45; Issue: 10 Linguagem: Inglês

10.1016/0584-8539(89)80065-0

1873-3824

E. M. Nour, Lamis Shahada,

Molecular Sensors and Ion Detection

The solid charge transfer complexes formed in the reaction of iodine with the polycyclic amines 1,4,8,12-tetraazacyclopentadecane (TACPD) and meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane (HMTACTD) have been investigated by resonance Raman and far i.r. spectroscopy. The spectra can be explained entirely by the presence of the I−3 ion in these complexes, whose composition agreed fairly well with the formulas (TACPD) I+·I−3 and (HMTACTD) I+·I−3. The three vibrations of the I−3 ion, νs(I—I), νas(I—I) and δ(I−3), are assigned at 109, 130 and 60 cm−1 for (TACPD)I+·I−3. and at 110, 145 and 61 cm−1 for (HMTACTD) I+·I−3. The structure and geometry of the I−3 ion is discussed in view of the Raman and i.r. band activities.