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Title: Phase Transitions in Tetramethylammonium Hexachlorometalate Compounds (TMA)2MCl6 (M = U, Np, Pt, Sn, Hf, Zr)

Journal Article · · European Journal of Inorganic Chemistry

A study of the phase transitions occurring in tetramethylammonium hexachlorometalate compounds with M = U IV , Np IV , Zr IV , Sn IV , Hf IV , and Pt IV were performed using single‐crystal X‐ray diffraction across the temperature range 120–400 K. When the crystals are cooled, movement of the octahedral [MCl 6 ] 2– anions induces a phase transition from Fm 3 m to Fd 3 c with a doubling of the unit cell. For the actinide compounds, no correlation between the f‐electron configuration and the transition temperature was observed; instead, a correlation between the transition temperatures and both the [MCl 6 ] 2– anion and the TMA cation size is highlighted. Two phase transitions were observed and characterized. The first phase transition occurs with the ordering of the TMA cation and the second from a rotation of the [MCl 6 ] 2– octahedra. A third phase transition was observed at lower temperatures and was ascribed to a tetragonal distortion of the [MCl 6 ] 2– anions. Synthesis and study of the deuterated compounds did not show a significant isotope effect. Raman spectra of the protonated and deuterated compounds indicate only weak hydrogen bonding interactions between the TMA cations and the [MCl 6 ] 2– octahedra.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1422404
Alternate ID(s):
OSTI ID: 1408148
Journal Information:
European Journal of Inorganic Chemistry, Vol. 2017, Issue 41; ISSN 1434-1948
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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