Abstract
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.
Highlights
Ionic liquids, classified as liquids composed solely of ions that have melting points below 100 °C, have been the subject of indepth investigations in recent years.[1]
We explore the effects of pressure as a stimulant in inducing changes in the structure of the magnetic ionic liquid described above
To investigate the conductivity behavior of the examined magnetic ionic liquid, we took advantage of broadband dielectric spectroscopy, a technique traditionally employed for studying the molecular dynamics of glass-forming systems
Summary
Ionic liquids, classified as liquids composed solely of ions that have melting points below 100 °C, have been the subject of indepth investigations in recent years.[1]. The studies of conductivity behavior of [P6,6,6,14][SCN]/[Co(NCS)2] mixture over a wide temperature (193−403 K) and pressure ranges (0.1−600 MPa) combined with calorimetric [differential scanning calorimetry (DSC)] and structural [X-ray diffraction (XRD) investigations enable us to provide new insight into the field of magnetic ionic liquids. In this case, we explore the effects of pressure as a stimulant in inducing changes in the structure of the magnetic ionic liquid described above. The two-dimensional diffraction patterns were converted into one-dimensional intensity data using suitable software
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