Observation of pressure-induced electron transfer in SnC2O4

Pravica, Michael; Chernikov, Roman; Ayala-Pineda, Kevin; Zhao, Jianbao; Cifligu, Petrika; McGlothen, Cheyenne

doi:10.1039/d1cp00306b

Observation of pressure-induced electron transfer in SnC₂O₄

Journal Article · Mon Mar 01 00:00:00 EST 2021 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/d1cp00306b· OSTI ID:1850352

^[1]; Chernikov, Roman ^[2]; Ayala-Pineda, Kevin ^[3]; Zhao, Jianbao ^[2]; Cifligu, Petrika ^[3]; McGlothen, Cheyenne ^[3]

Univ. of Nevada, Las Vegas, NV (United States); OSTI
Univ. of Saskatchewan, Saskatoon, SK (Canada). Canadian Light Source, Inc.
Univ. of Nevada, Las Vegas, NV (United States)

We examined the high pressure behavior of stannous oxalate via Raman and X-ray absorption spectroscopy (XAS) inside a diamond anvil cell. Phase transitions were observed to occur near 2.6 and 15 GPa which were reversible upon decompression to ambient conditions. When further pressurized above 15 GPa, the colorless material sustains irreversible chemical alterations and becomes bright red colored – darkening at higher pressures. Another irreversible phase transition occurred above 20 GPa. Concomitant with color change of the sample, we observed a softening of the ν(C–C) modes of the C₂O₄^2- anion via Raman spectroscopy. We performed a separate XAS experiment which indicates that the Sn²⁺ cation undergoes a partial reduction of the 2+ oxidation state with pressure which persists when the sample was depressurized to ambient conditions. Thus, electron density within the C–C bond in the oxalate anion appears to migrate toward the tin cation with pressure. This observation suggests that pressure can offer a very controllable means to vary cation–anion and unit cell dimensions (and thus the electric interactions causing electron movement) and thus the pressure-induced synthesis of novel materials.

Research Organization:: University of Nevada, Reno, NV (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FC08-01NV14049; NA0002912

OSTI ID:: 1850352

Alternate ID(s):: OSTI ID: 1769453

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 10 Vol. 23; ISSN 1463-9076; ISSN PPCPFQ

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Chemistry
Chemistry at extreme conditions
Diamond anvil cell
High pressure
Infrared spectroscopy
Oxalate salts
Physics
Pressure' Induced electron transfer
Pressure-induced chemical reaction
Raman spectroscopy
X-ray absorption spectroscopy

Observation of pressure-induced electron transfer in SnC2O4

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Observation of pressure-induced electron transfer in SnC₂O₄