Microporous aluminophosphates synthesized with 1,2,3-trimethylimidazolium and fluoride
SCIE
SCOPUS
- Title
- Microporous aluminophosphates synthesized with 1,2,3-trimethylimidazolium and fluoride
- Authors
- Lee, JH; Kim, EJ; Lopez-Arbeloa, F; Hong, SB; Camblor, MA
- Date Issued
- 2016-05
- Publisher
- ROYAL SOC CHEMISTRY
- Abstract
- The synthesis of microporous aluminophosphates using 1,2,3-trimethylimidazolium (123TMI) and fluoride produces three phases (HPM-3, PST-27 and triclinic AlPO4-34) depending on the amount of water and organic structure-directing agents in the synthesis mixture. Fluoride occluded in double 4-ring units was not detected by F-19 MAS NMR spectroscopy in any product. While the structure of HPM-3 remains unknown, PST-27 has been determined to be a monoclinic version of AlPO4-5 with a distorted and likely complex structure. Rietveld analysis using synchrotron diffraction data for as-made triclinic AlPO4-34 reveals that each of its cha-cages holds two 123TMI cations, forming a displaced anti-parallel dimer with a short distance between aromatic rings (3.78 angstrom from center to center, 3.63 angstrom from plane to plane). This suggests that pi-pi interactions may play a role in the synthesis of this phase and related CHA-type systems. A study of the optical properties of PST-27, AlPO4-34 and other materials containing 123TMI cations shows their complex fluorescence behavior, sometimes displaying a red-edge effect, i.e., a red shift of the fluorescence as the excitation wavelength is shifted toward the red edge of the absorption band. An absorption band at 291 nm appears only in the dimer-containing triclinic AlPO4-34 and is sensitive to the introduction of Si into the framework.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/37914
- DOI
- 10.1039/C6DT00734A
- ISSN
- 1477-9226
- Article Type
- Article
- Citation
- DALTON TRANSACTIONS, vol. 45, no. 18, page. 7616 - 7626, 2016-05
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.