Synthesis and characterization of iodine molecular wires in channels of zeolite AEL single crystals

Zhai, Jianpang; Lee, H F; Li, I L; Ruan, Shuangchen; Tang, Zikang

doi:10.1088/0957-4484/19/17/175604

Cited by 20 publications

(32 citation statements)

References 23 publications

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“…The iodine molecules are oriented along the major axis not the minor axis in AEL channels. This configuration is confirmed by molecular dynamics simulation as well as polarized Raman spectroscopy202128.…”

Section: Resultssupporting

confidence: 62%

“…We use aluminophosphate (AlPO 4 ) porous single crystals as the “molecular ruler”, which have been widely adopted as host template platforms since their ultra-small opening nano-channels are suitable to trap small guest molecules12131415161718192021. AlPO 4 single crystals are transparent from ultraviolet to near-infrared, which are appropriate for the optical investigation of the trapped guest molecules181920212223.…”

Section: Resultsmentioning

confidence: 99%

“…AlPO 4 single crystals are transparent from ultraviolet to near-infrared, which are appropriate for the optical investigation of the trapped guest molecules181920212223. We had introduced iodine molecules into the nano-channels of AlPO 4 -5 (AFI) and AlPO 4 -11 (AEL) single crystals and investigated the vibrational energy level separations of the confined iodine molecules in our previous work24.…”

Section: Resultsmentioning

confidence: 99%

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Estimating Atomic Sizes with Raman Spectroscopy

Wang

Guo

et al. 2013

Sci Rep

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We demonstrate a technique to determine the Van der Waals radius of iodine atoms using Raman spectroscopy. The iodine diatomic molecules are diffused into the nano-scale channels of a zeolite single crystal. We found their polarized Raman spectroscopy, which corresponds to iodine molecule's vibrational motion along the direction of molecular axis, is significantly modified by the interaction between the iodine molecules and the rigid frame of the crystal's nano-channels. From the number of excitable vibration quantum states of the confined iodine molecules determined from Raman spectra and the size of the nano-channels, we estimate the iodine atomic radius to be 2.10 ± 0.05 Å. It is the first time that atomic sizes, which are far beyond the optical diffraction limit, have be resolved optically using Raman spectroscopy with the help of nano-scale structures.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Estimating Atomic Sizes with Raman Spectroscopy

Wang

Guo

et al. 2013

Sci Rep

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“…In fact, the frequency of an (I 2 ) n chain has been reported to show a significant upshift to 196 or 199 cm −1 when it is confined inside elliptic channels of silicaferrierite (0.42−0.54 nm, 10-member ring channels) 11 and AEL (0.44−0.67 nm). 12 It should be noted here that the elliptic channels can be taken as a 2D confinement environment compared with the size of iodine molecule, in which the rotation of I 2 can only occur along the long-axis of the elliptic cross section of the channel. Thus, the vibration of the iodine molecule is different from that in a round channel of AFI, due to different confinement effect.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Pressure-Driven Topological Transformations of Iodine Confined in One-Dimensional Channels

et al. 2013

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The behavior of molecules and molecular chains confined in 1D nanochannels imposed by external interactions is a problem of fundamental interest. Here, we report structural manipulation of iodine confined inside zeolite (AFI) nanochannels by the application of high pressure. Structural transformations of the confined iodine under pressure have been unambiguously identified by polarized Raman spectroscopy combined with theoretical simulation. The length of the iodine chains and the orientation and intermolecular interaction of the confined iodine have been tuned at the molecular level by applied pressure. Almost all the confined iodine can be tuned into an axially oriented state upon compression, favoring the formation of long chains. The long iodine chains can be preserved to ambient pressure when released from intermediate pressures. ■ INTRODUCTIONStudies of the control and manipulation of atoms/molecules and their assemblies generate remarkable new insights into how physical and chemical systems function. They permit direct observation of molecular behavior that can be obscured by ensemble averaging and enables the study of important problems ranging from fundamental physics to the design of nanoscale electro-optical devices. In particular, much effort has been focused on the control of atomic/molecular chains due to their potential application as quantum wires. 1−9 By using simultaneous STM and TEM (transmission electron microscopy), gold nanowires composed of several atomic chains have been fabricated and show quantum conductance behavior. 2 Later, thinner nanowires have been fabricated in high vacuum with an electron beam thinning technique but the stability becomes lower with decreasing size and the length is still limited to a few nanometers (<6 nm). 3 On the other hand, filling materials into one-dimensional channels has been shown to be an efficient way to prepare atomic/molecular chains stable at ambient condition. 9−13 However, the atomic/molecular chains obtained usually show a mixture of different arrangements or have random orientations and are mixed with individual atoms/molecules in the channels due to size mismatch between the host channel and the filled species or because of inhomogeneous filling. 8−14 A typical example is that filling iodine into single wall carbon nanotubes (SWNTs) yields either helicoidal chains, polyiodides, discrete individual molecules, or new crystalline structures of iodine in the nanotube channels, depending on the tube diameter. 14−16 To obtain chains in a particular desired structural arrangement requires further manipulation. 17 For this purpose, understanding the transformation dynamics of the confined iodine imposed by external interactions becomes very important.High pressure serves as a powerful tuning parameter that has been used to tune the intermolecular interaction and structure of bulk materials. 18−23 In the confined environment, the configuration of the material is expected to be modified not only by the applied pressure but also by the evolution of the co...

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“…Previous literatures reported that iodine species including chain‐like, lying, and standing iodine molecules are present in the elliptical nanochannels of AEL crystals at room temperature, and the corresponding wavenumber are located at 199 cm −1 , 207 cm −1 , and 214 cm −1 , respectively . Fig.…”

Section: Resultsmentioning

confidence: 77%

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

Chen

Yao

Yuan

et al. 2015

J. Raman Spectrosc.

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Raman spectra of iodine species confined in one‐dimensional elliptical channels of AlPO4‐11 (AEL) crystals have been studied from room temperature down to −196 °C. As temperature decreases, thermal fluctuations of individual iodine molecules confined in AEL channels are slowed down and they prefer to rotate to channel axis direction, which increases the population of iodine molecules along channel axis (i.e., lying molecules and chains). Such temperature‐driven orientation transformation of iodine molecules is found to be reversible upon heating up to room temperature. The experimental observations are in good agreement with our theoretical simulations by molecular dynamics on low density iodine‐filled AEL crystals. We thus provide a new way to modulate the orientation of iodine molecules in nanochannels, which may have implications in low‐temperature‐sensitive nanoscale devices. Copyright © 2015 John Wiley & Sons, Ltd.

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Synthesis and characterization of iodine molecular wires in channels of zeolite AEL single crystals

Cited by 20 publications

References 23 publications

Estimating Atomic Sizes with Raman Spectroscopy

Estimating Atomic Sizes with Raman Spectroscopy

Pressure-Driven Topological Transformations of Iodine Confined in One-Dimensional Channels

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

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Synthesis and characterization of iodine molecular wires in channels of zeolite AEL single crystals

Cited by 20 publications

References 23 publications

Estimating Atomic Sizes with Raman Spectroscopy

Estimating Atomic Sizes with Raman Spectroscopy

Pressure-Driven Topological Transformations of Iodine Confined in One-Dimensional Channels

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

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