Thermal variations of iodine nanostructures inside the channels of AlPO4-5 zeolite single crystals

Physical Properties of Self-Assembled Porous Alumina Structures Filled with Iodine

“…In the last decades I/AFI composites prepared by infiltration of the quasi onedimensional nanochannels of AFI zeolite-like microporous aluminophosphate host matrix [1] with iodine guest substance (semiconductor with p-type conductivity) were thoroughly studied by polarized optical absorption and Raman spectroscopy, thermal gravimetry and differential scanning calorimetry [2][3][4] as well as by electrical methods [5]. Iodine species inserted inside the AFI zeolite-like framework were proposed to be a prospective candidate for iodine Raman laser design [4].…”

Transformations of iodine species inside elliptical channels of AlPO4 -11 crystals at low temperature: a Raman study

“…In addition, the intensity of the Raman peaks has also been used to identify the population changes of the iodine species confined in nanochannels. The temperature‐induced structural transformation from iodine chains to individual iodine molecules in AFI is accompanied by the decrease of Raman intensity due to iodine chains and increase of Raman intensity due to iodine molecules . Here, if we ignore the effect from Raman scattering cross‐section with variable temperature, the rising in relative integrated intensity ratio of iodine chains to standing iodine molecules suggests that the population of iodine molecules along channel axis is increasing upon cooling down.…”

“…The temperature‐induced structural transformation from iodine chains to individual iodine molecules in AFI is accompanied by the decrease of Raman intensity due to iodine chains and increase of Raman intensity due to iodine molecules . Here, if we ignore the effect from Raman scattering cross‐section with variable temperature, the rising in relative integrated intensity ratio of iodine chains to standing iodine molecules suggests that the population of iodine molecules along channel axis is increasing upon cooling down. This indicates that individual iodine molecules change their orientations and prefer the arrangement lying along the channel axis as the temperature decreases.…”

“…Recently, studies on confined iodine species in the round channels of AFI under thermal heating have been reported by Ye and co‐workers . They observed a novel phase transformation of iodine species between iodine chains and individual iodine molecules within this 1D confinement system at high temperatures.…”

Molecular iodine adsorption within Hofmann-type structures M(L)[M′(CN)4] (M = Ni, Co; M′ = Ni, Pd, Pt): impact of their composition

“…They present three peaks at 110(w), 144(m) and 167(s) cm -1 for the former and at 106(w), 135(m) and 167(s) cm -1 for the later. 47 Note however that the intensity of the low-frequency peak is weak in both configurations. In this line of thought, the two main peaks observed in Raman spectra of the iodine loaded clathrates may be attributed to the  1 symmetric mode of confined molecular iodine in the cages for the low frequency band (163 -168 cm -1 ) and the presence of the polyiodides species, such as I 3 -{I -, I 2 } together with the I 2 molecule for the low frequency band (105 -116 cm -1 ).…”