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

Éadaoin McCourt | Zendy; Ż. Wojnarowska | Zendy; Johan Jacquemin | Zendy; Peter Nockemann | Zendy; Haresh Manyar | Zendy; Ł. Hawełek | Zendy; Marian Paluch | Zendy

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

Author(s) -

Éadaoin McCourt,

Ż. Wojnarowska,

Johan Jacquemin,

Peter Nockemann,

Haresh Manyar,

Ł. Hawełek,

Marian Paluch

Publication year - 2016

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.6b01325

Subject(s) - phosphonium , cobalt , octahedron , ionic liquid , thiocyanate , chemistry , ionic conductivity , ionic bonding , ion , inorganic chemistry , conductivity , paramagnetism , crystallography , materials science , organic chemistry , electrode , physics , electrolyte , catalysis , quantum mechanics

The temperature- and pressure-induced paramagnetic switching of cobalt(II) complex in a 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 the 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.

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