K 3 Fe(CN) 6 under External Pressure: Dimerization of CN – Coupled with Electron Transfer to Fe(III)
Abstract
The addition polymerization of charged monomers like C≡C2– and C≡N– is scarcely seen at ambient conditions but can progress under external pressure with their conductivity significantly enhanced, which expands the research field of polymer science to inorganic salts. Moreover, the reaction pressures of transition metal cyanides like Prussian blue and K3Fe(CN)6 are much lower than that of alkali cyanides. To figure out the effect of the transition metal on the reaction, the crystal structure and electronic structure of K3Fe(CN)6 under external pressure are investigated by in situ neutron diffraction, in situ X-ray absorption fine structure (XAFS), and neutron pair distribution functions (PDF) up to ~15 GPa. The cyanide anions react following a sequence of approaching–bonding–stabilizing. The Fe(III) brings the cyanides closer which makes the bonding progress at a low pressure (2–4 GPa). At ~8 GPa, an electron transfers from the CN to Fe(III), reduces the charge density on cyanide ions, and stabilizes the reaction product of cyanide. Finally, from this study we can conclude that bringing the monomers closer and reducing their charge density are two effective routes to decrease the reaction pressure, which is important for designing novel pressure induced conductor and excellent electrode materials.
- Authors:
-
- Center for High Pressure Science and Technology Advanced Research, Beijing (China); Carnegie Inst. of Washington, Washington, DC (United States)
- Center for High Pressure Science and Technology Advanced Research, Beijing (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Center for High Pressure Science and Technology Advanced Research, Beijing (China); Carnegie Inst. of Washington, Argonne, IL (United States)
- Carnegie Inst. of Washington, Washington, DC (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research in Extreme Environments (EFree)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1265901
- Grant/Contract Number:
- AC05-00OR22725; FG02-99ER45775; SC0001057; U1530402
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 119; Journal Issue: 39; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Li, Kuo, Zheng, Haiyan, Wang, Lijuan, Tulk, Christopher A., Molaison, Jamie J., Feygenson, Mikhail, Yang, Wenge, Guthrie, Malcolm, and Mao, Hokwang. K 3 Fe(CN) 6 under External Pressure: Dimerization of CN – Coupled with Electron Transfer to Fe(III). United States: N. p., 2015.
Web. doi:10.1021/acs.jpcc.5b06793.
Li, Kuo, Zheng, Haiyan, Wang, Lijuan, Tulk, Christopher A., Molaison, Jamie J., Feygenson, Mikhail, Yang, Wenge, Guthrie, Malcolm, & Mao, Hokwang. K 3 Fe(CN) 6 under External Pressure: Dimerization of CN – Coupled with Electron Transfer to Fe(III). United States. https://doi.org/10.1021/acs.jpcc.5b06793
Li, Kuo, Zheng, Haiyan, Wang, Lijuan, Tulk, Christopher A., Molaison, Jamie J., Feygenson, Mikhail, Yang, Wenge, Guthrie, Malcolm, and Mao, Hokwang. Mon .
"K 3 Fe(CN) 6 under External Pressure: Dimerization of CN – Coupled with Electron Transfer to Fe(III)". United States. https://doi.org/10.1021/acs.jpcc.5b06793. https://www.osti.gov/servlets/purl/1265901.
@article{osti_1265901,
title = {K 3 Fe(CN) 6 under External Pressure: Dimerization of CN – Coupled with Electron Transfer to Fe(III)},
author = {Li, Kuo and Zheng, Haiyan and Wang, Lijuan and Tulk, Christopher A. and Molaison, Jamie J. and Feygenson, Mikhail and Yang, Wenge and Guthrie, Malcolm and Mao, Hokwang},
abstractNote = {The addition polymerization of charged monomers like C≡C2– and C≡N– is scarcely seen at ambient conditions but can progress under external pressure with their conductivity significantly enhanced, which expands the research field of polymer science to inorganic salts. Moreover, the reaction pressures of transition metal cyanides like Prussian blue and K3Fe(CN)6 are much lower than that of alkali cyanides. To figure out the effect of the transition metal on the reaction, the crystal structure and electronic structure of K3Fe(CN)6 under external pressure are investigated by in situ neutron diffraction, in situ X-ray absorption fine structure (XAFS), and neutron pair distribution functions (PDF) up to ~15 GPa. The cyanide anions react following a sequence of approaching–bonding–stabilizing. The Fe(III) brings the cyanides closer which makes the bonding progress at a low pressure (2–4 GPa). At ~8 GPa, an electron transfers from the CN to Fe(III), reduces the charge density on cyanide ions, and stabilizes the reaction product of cyanide. Finally, from this study we can conclude that bringing the monomers closer and reducing their charge density are two effective routes to decrease the reaction pressure, which is important for designing novel pressure induced conductor and excellent electrode materials.},
doi = {10.1021/acs.jpcc.5b06793},
journal = {Journal of Physical Chemistry. C},
number = 39,
volume = 119,
place = {United States},
year = {Mon Sep 14 00:00:00 EDT 2015},
month = {Mon Sep 14 00:00:00 EDT 2015}
}
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