摘要 : The interaction of the crown ether dibenzo-18-crown-6 (DBC) with iodine has been studied in CHCl3 at room temperature. The charge-transfer absorptions, far infrared and thermal measurements of the formed charge-transfer complex we... 展开 The interaction of the crown ether dibenzo-18-crown-6 (DBC) with iodine has been studied in CHCl3 at room temperature. The charge-transfer absorptions, far infrared and thermal measurements of the formed charge-transfer complex were recorded and discussed. The results obtained show the formation of the pentaiodide complex with the general formula [(DBC)](+) I-5(-). The pentaiodide ion, I-5(-), is described as I-3(-)(I-2) confirmed by the observation of the characteristic absorptions for 13 ion around 365 and 290 nm. In addition, the far infrared spectrum of the solid complex shows the three vibrations Of 13 unit is at 141, 113 and 71 cm(-1) assigned to v(as)(I-I) and v(s)(I-I) and delta(I-3(-)), respectively, while the band related to the vibration of 12 unit is observed at 180 cm(-1). Vibration analysis of the obtained data shows that the symmetry Of I-3(-) unit could be non-linear with C-2v symmetry. The structure of the formed pentaiodide complex was further supported by thermal gravimetric analysis measurements. (c) 2004 Published by Elsevier B.V. 收起