Temperature and Pressure Induced Structural Changes of Cobalt (II) in a Phosphonium Based Ionic Liquid

Eadaoin McCourt, Zaneta Wojnarowska, Johan Jacquemin, Peter Nockemann, Haresh G. Manyar, Łukasz Hawełek, Marian Paluch

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Abstract

In this paper the temperature and pressure induced paramagnetic switching of cobalt (II) complex in binary mixture of phosphonium based ionic liquid [P6,6,6,14]SCN and [Co(NCS)2], is reported. This arises from a structural change in the coordination of the cobalt (II) center from tetrahedral [Co(NCS)4]2- to octahedral [Co(NCS)6]4- when mobile thiocyanate ions are added. These properties are reflected in the abrupt change of conductivity behavior of the magnetic ionic liquid. Therefore, as demonstrated herein the reversible switching in coordination of cobalt from tetrahedral to octahedral can be easily monitored at ambient as well as elevated pressure by tracking the dc-conductivity changes.
Original languageEnglish
Pages (from-to)10156-10161
Number of pages6
JournalThe Journal of Physical Chemistry C
Volume120
Issue number19
Early online date29 Apr 2016
DOIs
Publication statusEarly online date - 29 Apr 2016

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